NTRS


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:CapitalToRiskWeightedAssets
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
us-gaap:TitleOfIndividual, us-gaap:AwardType

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaid

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestExpense

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestPaidNet

us-gaap:MarketingAndAdvertisingExpense

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:StatementBusinessSegments

us-gaap:Revenues

us-gaap:Assets
ntrs:LeveragedLeases, us-gaap:ConsolidatedEntities
ntrs:LeveragedLeases, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation
us-gaap:StatementGeographical

us-gaap:Liabilities
us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneRiskBasedCapital
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AmortizationOfIntangibleAssets
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Goodwill
us-gaap:BusinessAcquisition
us-gaap:StatementBusinessSegments

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssets
us-gaap:ConsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:TreasuryStockValue
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxAssetsNet

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance
us-gaap:IncomeTaxAuthority

ntrs:AllowanceForCreditLossRecovery

ntrs:AllowanceForCreditLossWriteoff

ntrs:AverageInterestBearingDepositsInFederalReserveBankForReserveRequirements

ntrs:ChangeInFederalFundsPurchased

ntrs:ChangeInPresentExpenseReversalAndWriteoffAfterRecovery
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
ntrs:ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement

ntrs:CreditLossExpenseReversal

ntrs:CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss
us-gaap:StatementBusinessSegments

ntrs:DebtSecuritiesHeldToMaturityUnrealizedGainLossTransferFromAvailableForSale

ntrs:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForAmortizationPeriodAdjustment

ntrs:EquipmentAndSoftwareExpense
ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanRestructuringModificationName
ntrs:FinancingReceivableNonTDRModificationsDeferredInterest
ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName
ntrs:DeferralStatus, us-gaap:LoanRestructuringModificationName
ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanRestructuringModificationName
ntrs:FinancingReceivableNonTDRModificationsDeferredPrincipal
ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName
ntrs:DeferralStatus, us-gaap:LoanRestructuringModificationName
ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanRestructuringModificationName
ntrs:FinancingReceivableNonTDRModificationsRecordedInvestment
ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName
ntrs:DeferralStatus, us-gaap:LoanRestructuringModificationName
us-gaap:LoanRestructuringModificationName
ntrs:FinancingReceivableNonTDRModificationsRecordedInvestmentPaidOff

ntrs:FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ntrs:HeldToMaturitySecuritiesTransferredFromAvailableForSale

ntrs:IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:InterestExpenseSeniorNotes

ntrs:InterestIncomeFederalReserveDepositsAndOther

ntrs:InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:InvestmentSecurityGainsLossesNet

ntrs:NetChangeInClientSecuritySettlementReceivables

ntrs:NetIncomeLossAllocatedToCommonStockholdersBasic

ntrs:NoninterestExpenseOther

ntrs:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTa

ntrs:OtherFinancialAssetsCreditLossExpenseReversal

ntrs:OtherNoninterestIncome

ntrs:PaymentsForProceedsFromFederalReserveAndForeignCentralBankDeposits

ntrs:PercentageOfConsolidatedNetIncome
us-gaap:StatementBusinessSegments

ntrs:ProceedsfromSaleofInvestmentSecurities

ntrs:RevenueIncludingFullyTaxableEquivalentAdjustment
us-gaap:StatementBusinessSegments

ntrs:SalariesWagesAndIncentives

ntrs:SecurityCommissionsandTradingIncome

ntrs:SegmentReportingInformationConsolidatedAverageAssets
us-gaap:StatementBusinessSegments

ntrs:SegmentReportingInformationFullyTaxableEquivalentAdjustment
us-gaap:AwardType
ntrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue

ntrs:TreasuryManagementFees

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationConsiderationTransferred1

us-gaap:CapitalizedComputerSoftwareAmortization1
us-gaap:InformationByCategoryOfDebtSecurity
us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal
us-gaap:FinancialInstrument
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanActuarialGainLoss
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCostCreditIncreaseDecreaseForPlanAmendment

us-gaap:DefinedBenefitPlanPlanAmendments
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationNonproduction
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:HedgingDesignation

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:AwardType
us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

us-gaap:FederalDepositInsuranceCorporationPremiumExpense

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableNonaccrualInterestIncome

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
us-gaap:StatementBusinessSegments
us-gaap:IncomeStatementLocation
us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInDerivativeAssets

us-gaap:IncreaseDecreaseInFederalFundsSold

us-gaap:IncreaseDecreaseInInterestPayableNet

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestExpenseDeposits

us-gaap:InterestExpenseFederalFundsPurchased

us-gaap:InterestExpenseJuniorSubordinatedDebentures

us-gaap:InterestExpenseOtherLongTermDebt

us-gaap:InterestExpenseOtherShortTermBorrowings

us-gaap:InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase

us-gaap:InterestIncomeDepositsWithFinancialInstitutions

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:InvestmentCompanyVoluntaryFeeWaived
us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities
us-gaap:LoanProcessingFee

us-gaap:MarketableSecuritiesGainLoss

us-gaap:NoninterestExpense
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncome
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncomeOther
us-gaap:StatementBusinessSegments

us-gaap:NoninterestIncomeOtherOperatingIncome

us-gaap:OccupancyNet
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax
us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherLaborRelatedExpenses

us-gaap:OtherNoninterestExpense

us-gaap:OtherOperatingIncome
us-gaap:ProductOrService

us-gaap:PaymentsForProceedsFromLoansAndLeases

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForRepurchaseOfPreferredStockAndPreferenceStock

us-gaap:PaymentsForSoftware

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

us-gaap:PaymentsToAcquireHeldToMaturitySecurities

us-gaap:PensionContributions

us-gaap:ProceedsFromIssuanceOfSeniorLongTermDebt

us-gaap:ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities

us-gaap:ProceedsFromPaymentsForFederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResellNet

us-gaap:ProceedsFromPaymentsForInInterestBearingDepositsInBanks

us-gaap:ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForSecuritiesPurchasedUnderAgreementsToResell

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

us-gaap:ProceedsFromStockOptionsExercised

us-gaap:ProfessionalFees

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:TransferToOtherRealEstate

us-gaap:TreasuryStockAcquiredAverageCostPerShare

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:StatementEquityComponents

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
ntrs:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax
us-gaap:RetirementPlanType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
ntrs:AffordableHousingInvestment
us-gaap:FairValueByMeasurementBasis

ntrs:AllowanceForCreditLoss

ntrs:AllowanceForCreditLossExcludingOffBalanceSheetCreditLossLiability
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
ntrs:CashCollateralDepositedWithDerivativeCounterpartiesNotOffsetAgainstDerivativeLiabilities
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
ntrs:CashCollateralReceivedFromDerivativeCounterpartiesNotOffsetAgainstDerivativeAssets

ntrs:ClientSecuritySettlementReceivables
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:LineOfCreditFacility
ntrs:CommitmentsParticipatedToOthers

ntrs:CommitmentsToExtendCredit
us-gaap:StatementClassOfStock
ntrs:CommonStockSharesHeld

ntrs:ContractualMaturitiesTimeDeposits250000OrMoreAfterYearFive
us-gaap:GeographicDistribution

ntrs:ContractualMaturitiesTimeDeposits250000OrMoreNextTwelveMonths
us-gaap:GeographicDistribution

ntrs:ContractualMaturitiesTimeDeposits250000OrMoreYearFive
us-gaap:GeographicDistribution

ntrs:ContractualMaturitiesTimeDeposits250000OrMoreYearFour
us-gaap:GeographicDistribution

ntrs:ContractualMaturitiesTimeDeposits250000OrMoreYearThree
us-gaap:GeographicDistribution

ntrs:ContractualMaturitiesTimeDeposits250000OrMoreYearTwo
us-gaap:GeographicDistribution

ntrs:CreditRiskToBanks

ntrs:CreditRiskToBanksNonInterestBearingBalancesHeldAtBanks
ntrs:CreditRatingMoodysAndStandardPoors
ntrs:DebtSecuritiesHeldToMaturityPercentOfPortfolio
ntrs:CreditRatingMoodysAndStandardPoors, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

ntrs:DeferredTaxLiabilitiesCompensationAndBenefits

ntrs:DeferredTaxLiabilitiesStateTaxes
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
ntrs:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets

ntrs:DerivativeAssetNotOffset

ntrs:DerivativeAssetNotSubjecttoMasterNettingArrangementNet

ntrs:DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellCollateral

ntrs:DerivativeLiabilityNotOffset

ntrs:DerivativeLiabilityNotSubjectToMasterNettingArrangementNet

ntrs:DerivativeLiabilitySecuritiesSoldUnderAgreementToRepurchaseCollateral

ntrs:FairValueDisclosureOffBalanceSheetRisksAmountCurrentLiability
us-gaap:FinancialInstrument
us-gaap:GuaranteeObligationsByNature

ntrs:FairValueDisclosureOffBalanceSheetRisksAmountNonCurrentLiability
us-gaap:FinancialInstrument

ntrs:FederalReserveAndForeignCentralBankDeposits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

ntrs:FinancingReceivableAccrual
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivablesPeriodPastDue

ntrs:FinancingReceivableAllowanceForCreditLossesAndOffBalanceSheetCreditLossLiability
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ntrs:FinancingReceivableNonaccrualIncludingOtherRealEstateOwned

ntrs:FinancingReceivableNonaccrualTroubledDebtRestructuring

ntrs:HedgedAssetFairValueHedgeDiscontinuedCumulativeIncreaseDecrease

ntrs:HedgedAssetLiabilityFairValueHedgeCumulativeIncreaseDecreaseNet
ntrs:IndustryType, us-gaap:ConsolidatedEntities
ntrs:InvestmentInConsolidatedSubsidiary
us-gaap:BalanceSheetLocation
ntrs:InvestmentsInCommunityDevelopmentProjectsCarryingAmountAssets
us-gaap:BalanceSheetLocation
ntrs:InvestmentsInCommunityDevelopmentProjectsCarryingAmountLiabilities

ntrs:LesseeOperatingLeaseLeaseNotyetCommencedLiability

ntrs:LoansAndLeasesReceivableResidentialRealEstate
us-gaap:StatementGeographical
us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities
ntrs:LoansApprovedAndFullyForgiven
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType
ntrs:LoansMeasurementInput
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:LoansReceivableCommercialConstructionAcquisitionAndDevelopment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:LoansReceivableCommercialRealEstateCommercialMortgageApartmentsAndMultiFamily
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:LoansReceivableCommercialRealEstateCommercialMortgageIndustrialAndWarehouse
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:LoansReceivableCommercialRealEstateCommercialMortgageOffice
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:LoansReceivableCommercialRealEstateCommercialMortgageOther
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:LoansReceivableCommercialRealEstateCommercialMortgageRetail
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
ntrs:LoansReceivableHeldToMaturity
us-gaap:FairValueByMeasurementBasis

ntrs:LoansReceivableOverdraftAdvances

ntrs:LongTermDebtQualifyingAsRiskBasedCapital

ntrs:OffBalanceSheetCreditLossLiabilityCollectivelyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ntrs:OffBalanceSheetCreditLossLiabilityIndividuallyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

ntrs:OtherAssetsExcludingDerivativesAndNonFinancialInstruments

ntrs:OtherFinancialAssetsAccruedInterestAfterAllowanceForCreditLoss

ntrs:OtherFinancialAssetsAllowanceForCreditLoss

ntrs:OtherFinancialAssetsAllowanceForCreditLossExcludingAccruedInterest

ntrs:OtherLiabilitiesExcludingDerivativesAndNonFinancialInstruments

ntrs:OverdrawnDemandDepositAccounts
us-gaap:FinancialInstrument
ntrs:PercentageOfCorporateDebtPortfolio

ntrs:PercentageofSecuritiesEligibleforTier2CapitalTreatment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
ntrs:PercentageofTotalEquityCreditLines

ntrs:ResidentialRealEstateLoansPercentageOfTotalUSLoansandLeases

ntrs:SecuritiesContinuousUnrealizedLossPositionAggregateLosses
us-gaap:FinancialInstrument

ntrs:SecuritiesContinuousUnrealizedLossPositionFairValue

ntrs:SecuritiesEligibleforTier2CapitalTreatmentDeclineRate
us-gaap:LossContingenciesByNatureOfContingency
ntrs:SecuritiesLoanedSubjectToIndemnification
us-gaap:AwardType
ntrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertibleIntrinsicValue
us-gaap:AwardType
ntrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
ntrs:StandbyLettersOfCredit
us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
ntrs:SupplementaryLeverageCapital
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
ntrs:SupplementaryLeverageCapitalRequiredtobeWellCapitalized
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
ntrs:SupplementaryLeverageCapitaltoAverageAssets
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark

ntrs:TimeDeposits250000OrMore
us-gaap:GeographicDistribution

ntrs:TrustPreferredSecurities
us-gaap:ConsolidatedEntities
us-gaap:DebtInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
us-gaap:RetirementPlanType
ntrs:IndustryType, us-gaap:ConsolidatedEntities
us-gaap:AdvancesToAffiliate
us-gaap:BalanceSheetLocation
us-gaap:AlternativeInvestment
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType

us-gaap:AssetsNeededForImmediateSettlementAggregateFairValue

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:FinancialInstrument

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:BusinessAcquisition
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:Capital
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:CapitalRequiredToBeWellCapitalized
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark

us-gaap:CashAndDueFromBanks
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:CollateralAlreadyPostedAggregateFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:CommitmentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:ProductOrService
us-gaap:ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss

us-gaap:ContractWithCustomerAssetNet
us-gaap:ProductOrService

us-gaap:DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss

us-gaap:DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss
ntrs:CreditRatingMoodysAndStandardPoors
ntrs:CreditRatingMoodysAndStandardPoors, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DebtSecuritiesTradingAndAvailableForSale
us-gaap:FairValueByMeasurementFrequency

us-gaap:DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:DeferredCompensationPlanAssets
us-gaap:FairValueByMeasurementBasis
us-gaap:LongtermDebtType
us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses

us-gaap:DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanType
ntrs:PostRetirementPlanDisclosures, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:Range, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
ntrs:PostRetirementPlanDisclosures, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:DemandDepositAccounts
us-gaap:FairValueByMeasurementBasis

us-gaap:Deposits

us-gaap:DepositsSavingsDeposits

us-gaap:DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeAssetFairValueGrossLiability
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection

us-gaap:DerivativeAssetNotSubjectToMasterNettingArrangement

us-gaap:DerivativeAssetNotSubjectToMasterNettingArrangementDeduction

us-gaap:DerivativeAssets
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeCollateralObligationToReturnCash
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeCollateralRightToReclaimCash
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeLiabilities
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeLiabilityFairValueGrossAsset
us-gaap:CreditDerivativesByContractType, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType
us-gaap:DerivativeLiabilityMeasurementInput
us-gaap:Range, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:MeasurementInputType

us-gaap:DerivativeLiabilityNotSubjectToMasterNettingArrangement

us-gaap:DerivativeLiabilityNotSubjectToMasterNettingArrangementDeduction

us-gaap:DerivativeNetLiabilityPositionAggregateFairValue

us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:HedgingDesignation

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:FairValueDisclosureOffbalanceSheetRisksAmountLiability
us-gaap:FinancialInstrument
us-gaap:GuaranteeObligationsByNature
us-gaap:GuaranteeObligationsByNature, us-gaap:LineOfCreditFacility

us-gaap:FairValueHedgesAtFairValueNet

us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
us-gaap:FairValueByLiabilityClass
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
ntrs:PledgedAndRestrictedAssets
us-gaap:FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged

us-gaap:FederalFundsPurchased
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:FederalFundsSold

us-gaap:FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FederalHomeLoanBankStockAndFederalReserveBankStock
us-gaap:FairValueByMeasurementBasis

us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty

us-gaap:FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss

us-gaap:FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
us-gaap:CumulativeEffectPeriodOfAdoption
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableCollectivelyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableDeferredIncome

us-gaap:FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities

us-gaap:FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableExcludingAccruedInterestRevolving
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableIndividuallyEvaluatedForImpairment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableModificationsRecordedInvestment

us-gaap:FinancingReceivableNonaccrualNoAllowance
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedInCurrentFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableRecordedInvestmentCurrent
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:FinancingReceivableRecordedInvestmentNonaccrualStatus
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivableRecordedInvestmentPastDue
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivablesPeriodPastDue
us-gaap:FinancingReceivablesPeriodPastDue

us-gaap:FinancingReceivableRevolving
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FinancingReceivableRevolvingConvertedToTermLoan
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:HedgedAssetFairValueHedge

us-gaap:HedgedAssetFairValueHedgeCumulativeIncreaseDecrease

us-gaap:HedgedLiabilityFairValueHedge

us-gaap:HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease

us-gaap:HeldToMaturitySecurities

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
us-gaap:FinancialInstrument

us-gaap:HeldToMaturitySecuritiesFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:FinancialInstrument
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ImpairedFinancingReceivableRecordedInvestment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:ImpairedFinancingReceivableUnpaidPrincipalBalance

us-gaap:IncomeTaxExaminationPenaltiesAndInterestAccrued

us-gaap:InterestBearingDepositLiabilitiesForeign
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:InterestBearingDepositsInBanks
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:InterestReceivable

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureDeferredIncome

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureInvestmentInLeveragedLeasesNet

us-gaap:LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureRentalReceivablesNet

us-gaap:LoansAndLeasesReceivableImpairedCommitmentToLend
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:LoansReceivableHeldForSaleNetNotPartOfDisposalGroup
us-gaap:FairValueByMeasurementBasis
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:Range
us-gaap:LossContingencyEstimateOfPossibleLoss

us-gaap:MarketableSecurities

us-gaap:MortgageLoansInProcessOfForeclosureAmount

us-gaap:NoninterestBearingDepositLiabilitiesDomestic

us-gaap:NoninterestBearingDepositLiabilitiesForeign

us-gaap:NotesReceivableGross
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:InternalCreditAssessment
us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities

us-gaap:NotesReceivableNet

us-gaap:OffBalanceSheetCreditLossLiability
us-gaap:CumulativeEffectPeriodOfAdoption
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivablePortfolioSegment
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:OtherBorrowings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:OtherLongTermDebt

us-gaap:OtherRealEstateAndForeclosedAssets
us-gaap:ConsolidatedEntities
us-gaap:PreferredStockValue
us-gaap:StatementClassOfStock
us-gaap:AssetsSoldUnderAgreementsToRepurchase, us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods
us-gaap:SecuredDebtRepurchaseAgreements
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods

us-gaap:SecuritiesHeldAsCollateralAtFairValue
ntrs:PledgedAndRestrictedAssets
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:SecuritiesLoanedGross

us-gaap:SecuritiesPurchasedUnderAgreementsToResell
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:SecuritiesPurchasedUnderAgreementsToResellGross

us-gaap:SecuritiesSoldUnderAgreementsToRepurchase
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseGross

us-gaap:SecurityOwnedAndPledgedAsCollateralFairValue
ntrs:PledgedAndRestrictedAssets

us-gaap:SeniorNotes
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:LongtermDebtType
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:SubordinatedDebt
us-gaap:LongtermDebtType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:SubordinatedLongTermDebt
us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:SupplementaryLeverageRatio
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneLeverageCapital
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneLeverageCapitalRequiredToBeWellCapitalized
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneLeverageCapitalToAverageAssets
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneRiskBasedCapitalRequiredToBeWellCapitalized
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark

us-gaap:TimeDeposits
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:TradingSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:TradingSecuritiesDebt
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementFrequency

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Net Income Loss
Expenses
Interest Expense
Balance Sheet
Finite Lived Intangible Assets Net
Assets
Property Plant And Equipment Net
Current Assets
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents
NonCurrent Assets
Finite Lived Intangible Assets Net
PropertyPlantAndEquipmentNet
Property Plant And Equipment Net
Liabilities
Derivative Liabilities
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Proceeds From Payments For Other Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
DividendsAndRepurchase
Payments For Repurchase Of Common Stock
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
BanksAndOrInsurance
Interest And Dividend Income Operating
AssetsBanks
Notes Receivable Net
LiabilitiesBanks
Deposits

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockParOrStatedValuePerShare ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁█▁1.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6667e-061.6699999999999999e-061.6667e-06NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁209.13809208.946448NA208.688494208.568357209.816822NA214.206576217.169539219.270215NA223.860014225.611397227.047519NA229.313645230.637823230.630876NA228.055195229.197013229.97969NA234.16319235.232835235.288695NA237.737129237.753679239.050714NA241.330652241.040681240.189215NA240.697062241.367982241.556096NA241.193993241.912058242.969629NA242.158427242.597066242.513391
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁208.369188208.112824NA208.10619208.068635208.881131NA213.176809216.139033218.236802NA222.442797224.20759225.681167NA228.010866229.196531229.05954NA226.540086227.535701228.619089NA232.23172233.14902233.381168NA235.701076236.012703237.208151NA239.930074239.738592239.167559NA240.237014240.900839241.090093NA240.991491241.484195242.126162NA242.124461242.045799241.724178
us-gaap:EarningsPerShareBasic █▇▄▅▆▇▇▇█▆█▇▇▇▆▅▄▄▄▄▄▄▄▃▄▃▃▃▂▂▂▃▂▂▂▂▂▂▁▂▁▁▂▂▃▂1.731.711.13000000000000081.321.471.561.711.71.761.491.80999999999999961.591.691.591.521.211.121.11.11999999999999971.091.11.011.00000000000000040.971.110.950.980.850.760.750.69999999999999970.850.780.680.690.730.730.660.53000000000000020.70.620.620.64000000000000010.640.820.65
us-gaap:EarningsPerShareDiluted █▇▄▅▆▇█▇█▆█▇▇▇▆▅▄▄▄▄▄▄▄▃▄▃▃▃▂▂▂▃▂▂▂▂▂▂▁▂▁▁▂▂▃▂1.721.71.121.321.461.551.711.691.751.481.79999999999999981.581.681.581.50999999999999981.21.121.091.11000000000000031.081.091.010.99000000000000020.961.10.940.980.840.750.750.70000000000000020.840.780.670.690.730.730.660.54000000000000030.70.620.610.64000000000000010.640.820.64
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark ntrs:WhollyOwnedSubsidiary,us-gaap:AdvancedApproachNANA1.38e-05NANANA1.3e-07NANANA1.4099999999999998e-07NANANA1.3700000000000002e-07NANANA1.24e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark ntrs:WhollyOwnedSubsidiary,us-gaap:StandardizedApproachNANA1.3e-05NANANA1.23e-07NANANA1.31e-07NANANA1.26e-07NANANA1.1500000000000001e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents ntrs:WhollyOwnedSubsidiary,us-gaap:AdvancedApproach,us-gaap:CommonStockNANA1.38e-05NANANA1.3e-07NANANA1.4099999999999998e-07NANANA1.3700000000000002e-07NANANA1.24e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents ntrs:WhollyOwnedSubsidiary,us-gaap:StandardizedApproach,us-gaap:CommonStockNANA1.3e-05NANANA1.23e-07NANANA1.31e-07NANANA1.26e-07NANANA1.1500000000000001e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark srt:ParentCompany,us-gaap:AdvancedApproachNANA1.45e-05NANANA1.5e-07NANANA1.5e-07NANANA1.48e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark srt:ParentCompany,us-gaap:StandardizedApproachNANA1.39e-05NANANA1.45e-07NANANA1.4099999999999998e-07NANANA1.3800000000000002e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents srt:ParentCompany,us-gaap:AdvancedApproach,us-gaap:CommonStockNANA1.34e-05NANANA1.3200000000000002e-07NANANA1.3700000000000002e-07NANANA1.35e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents srt:ParentCompany,us-gaap:StandardizedApproach,us-gaap:CommonStockNANA1.2800000000000001e-05NANANA1.27e-07NANANA1.29e-07NANANA1.26e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CapitalToRiskWeightedAssets dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark ntrs:WhollyOwnedSubsidiary,us-gaap:AdvancedApproachNANA1.5e-05NANANA1.4599999999999998e-07NANANA1.58e-07NANANA1.54e-07NANANA1.4e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CapitalToRiskWeightedAssets dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark ntrs:WhollyOwnedSubsidiary,us-gaap:StandardizedApproachNANA1.45e-05NANANA1.4e-07NANANA1.48e-07NANANA1.43e-07NANANA1.33e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark srt:ParentCompany,us-gaap:AdvancedApproachNANA1.59e-05NANANA1.6800000000000002e-07NANANA1.6900000000000002e-07NANANA1.67e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark srt:ParentCompany,us-gaap:StandardizedApproachNANA1.56e-05NANANA1.6300000000000002e-07NANANA1.61e-07NANANA1.58e-07NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AllocatedShareBasedCompensationExpense ▂▇▁▂▂█▂▂▂█▃▃▅█▃▃▄█▃▃▃▄▂▂▃▃▂▂▃▃▂▂▂▃▂▂▂▃▂▂▂▃▁▁▁▂18.850.58.613.915.153.816.617.318.755.321.719.533.256.521.821.628.656.020.620.420.025.817.516.819.222.916.418.020.223.117.117.918.320.515.916.617.224.215.915.715.922.811.811.411.917.6
us-gaap:ComprehensiveIncomeNetOfTax ▆▁▄▅██▄▆▇▆▆▅▅▄▄▄▄▄▃▄▄▅▂▃▄▄▂▃▃▃▄▃▂▃▂▄▃▃▁▃▃▃▂▃▃▃496.913.0244.4348.6638.7600.3267.4453.4574.9455.5483.1355.7388.0315.5277.4302.2281.0294.1156.2237.5305.0330.6140.3234.6261.9284.0142.7191.3212.8189.6263.3219.3124.5162.9100.6237.0181.8230.517.1181.2188.3176.7117.9204.8216.8186.3
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ██▅▆▆▇▇██▇█▇█▇▆▆▆▆▆▅▆▅▅▅▆▅▅▄▃▃▃▄▃▂▂▃▃▂▁▃▂▂▂▂▄486.5495.9373.4389.9403.2461.1476.4508.6506.9452.2485.9481.0507.2483.7435.6416.6390.8390.9389.5373.7394.7359.2350.4353.2411.4350.0345.8304.2270.7269.5245.7301.5285.8242.5223.2266.1266.2236.8171.4252.8229.5230.0214.4237.4299.8NA
us-gaap:IncomeTaxExpenseBenefit ▆▇▇▅▄▅▅▇▆▅▃▆▆▅▄▆▇▆▇▆▇▆▆▆█▆▅▅▄▄▃▅▅▄▂▄▄▃▁▄▄▄▂▄▅▄118.4120.8132.595.489.9100.5105.3124.0117.5105.176.0106.5116.8102.179.0118.2122.9114.8123.0116.1134.0117.4111.1118.6142.2119.3101.899.788.888.176.095.094.778.555.587.386.675.641.282.477.579.057.381.8100.281.0
us-gaap:IncomeTaxesPaid ▆▄▄▄▅▄▄▅▆▄▅▆▆▄▅▄▇▄▆▆▆▇▁█▆▄▅▅▄▃▄▅▄▃▄▅▄▃▄▄▄▃▄▅158.930.863.274.8117.172.676.7127.3205.827.2141.3151.5171.029.792.336.7268.743.5157.3183.5198.4215.0-136.9302.8183.640.5119.585.659.015.178.492.377.414.524.198.361.34.829.745.566.811.336.4103.4NANA
us-gaap:InterestAndFeeIncomeLoansAndLeases ▁▁▁▁▂▅▆▇███▇▆▅▅▅▄▃▃▃▃▃▂▂▁▂▂▂▂▂▂▂▂▂▃▃▃▄▄▄▅▅▅▄▄▄172.2172.0168.2167.1189.1250.2263.6291.0300.6298.2292.5282.9271.4252.0241.9239.4224.4213.4202.2202.1201.3200.9190.3186.7171.0183.9182.4184.8185.8182.9184.6185.4185.5187.6198.2206.9205.8217.6219.2229.8243.2246.4245.6231.9226.2224.3
us-gaap:InterestExpense ▁▁▁▂▂▄▅▇▇██▇▅▄▄▄▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▃▃▃▃▃▃▃▄▄▄▄▃▃7.59.818.226.834.2121.1155.3203.1222.8240.8231.4191.0154.4121.9108.199.675.756.846.746.145.044.241.336.837.638.240.044.547.249.752.554.155.260.667.977.567.484.683.090.3113.6112.7112.396.785.183.9
us-gaap:InterestIncomeExpenseNet ▅▅▅▅▆████████▇▇▆▅▆▅▄▄▄▃▃▂▂▃▂▂▂▂▂▁▁▁▂▂▂▃▂▂▁▁▁▁▁335.6340.1334.4328.6372.1408.1420.8417.7417.4422.0417.2408.2413.3384.0380.0354.2341.5353.5324.3303.1299.7307.8289.4268.9251.2260.6263.9249.3246.6245.7249.9237.0220.1226.1234.2245.6254.1256.4271.8256.8246.1234.4222.0233.5232.8230.4
us-gaap:InterestPaidNet ▁▁▂▁▂▅▆▇▇██▆▅▄▄15.02.236.515.648.0126.7169.6206.7225.0244.2228.8178.0147.4116.0113.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MarketingAndAdvertisingExpense █▁8.97.9NANA7.918.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▇▇▄▅▆▇▇▇▇▆█▇█▇▇▅▄▅▄▄▄▄▄▄▄▄▄▃▂▂▂▃▃▂▂▂▂▂▁▂▂▂▂▂▃▂368.1375.1240.9294.5313.3360.6371.1384.6389.4347.1409.9374.5390.4381.6356.6298.4267.9276.1266.5257.6260.7241.8239.3234.6269.2230.7244.0204.5181.9181.4169.7206.5191.1164.0167.7178.8179.6161.2130.2170.4152.0151.0157.1155.6199.6157.2
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▇▇▄▅▆▆▇▇▇▆█▇█▇▇▅▄▄▄▄▄▄▄▄▄▃▄▃▂▂▂▃▃▂▂▂▂▂▁▂▂▂▂▂▃▂363.4358.9236.2278.3308.5330.1365.3367.2383.5329.8404.0357.2384.5364.3350.7281.1262.0255.4260.7251.7254.9235.9233.4228.8263.4224.8234.5204.5181.9181.4169.7206.5191.1164.0167.7178.8179.6161.2130.2170.4152.0151.0157.1155.6199.6157.2
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted ▇▇▄▅▆▆▇▇█▆█▇█▇▇▅▄▄▄▄▄▄▄▄▄▃▄▃▂▂▂▃▃▂▂▂▂▂▁▂▂▂▂▂▃▂360.2355.2234.8275.0305.2326.2361.0362.7379.8325.4398.2353.1379.5359.2345.3276.7257.6250.9255.6247.0250.1231.9229.6225.0259.3221.1230.6201.0178.8178.5167.0203.0187.9161.5165.3176.0176.9160.0128.6168.4150.2149.3155.7154.3198.0155.9
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▄▄▃▄▄█▅▅▆▆▅▅▆▁▅▄▄▄▃▂▅▄▁▃▄▂▄▃▂▃▃▃▄▃▃▆▂▆▁▄▄2.15.0-2.61.82.025.711.19.914.114.811.110.613.6-13.16.23.64.92.0-1.6-9.56.33.9-13.5-2.35.8-5.91.7-3.6-5.6-1.3-0.6-4.45.8-4.2-4.114.2-5.915.8-13.11.22.2NANANANANA
us-gaap:PreferredStockDividendsIncomeStatementImpact ▂▅▂▅▂█▂▅▂▅▂▅▂▅▂▅▂▆▂▂▂▂▂▂▂▂▃▁4.716.24.716.24.830.55.817.45.917.35.917.35.917.35.917.35.920.75.85.95.85.95.95.85.85.99.50.0NANANANANANANANANANANANANANANANANANA
us-gaap:RealizedInvestmentGainsLosses NANA-0.50.00.1NA-0.5-0.4-0.3NANANANANANANANANANANANANANANANANANANANANANANANANANANA0.50.7-1.40.70.3-0.40.00.50.0NA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax █▇▆▅▃▅▄▃▂▁▁▁▂1075.41063.71026.11003.8961.51003.6992.2975.5955.5928.9933.9939.2942.9NANANANANANANANANANANANANANANANANANANANANANANANANA924.8981.3955.3NA867.3899.0973.8NA
us-gaap:Revenues ▁▁█▁▁▁█▁▁▁█▁▁1075.41063.73131.91003.8961.51003.63213.2975.5955.5928.93140.4939.2942.9NANANANANANANANANANANANANANANANANANANANANANANANANA924.8981.3955.3NA867.3899.0973.8NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▇█▆▆▇▅▄▄▄▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁172291.1163924.1170003.9152082.0151432.9161709.2136828.4124355.8126550.9121869.4132212.5132378.5135106.2129672.2138590.5131400.2125605.7121488.7123926.9120085.0121509.6117798.8116749.6119995.2119942.9106952.0109946.5111153.7105761.2103832.6102947.395969.597236.093156.897463.893632.594455.991604.3100223.796098.297398.392679.283843.9NANANA
us-gaap:Liabilities █▇█▆▆▇▅▄▄▄▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁160468.1152466.2158315.6140502.9140050.7150829.5125737.4113544.5115745.4111253.2121704.2122014.0124748.6119446.2128374.3121235.0115537.8111511.0114156.5110505.2112558.1108966.0108043.7111210.7111193.698344.4101497.6102611.197718.695884.395035.388152.489511.485544.789936.886100.387065.684381.193106.488945.490372.985751.077013.6NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇█▆▆▇▅▄▄▄▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁172291.1163924.1170003.9152082.0151432.9161709.2136828.4124355.8126550.9121869.4132212.5132378.5135106.2129672.2138590.5131400.2125605.7121488.7123926.9120085.0121509.6117798.8116749.6119995.2119942.9106952.0109946.5111153.7105761.2103832.6102947.395969.597236.093156.897463.893632.594455.991604.3100223.796098.297398.392679.283843.9NANANA
us-gaap:StockholdersEquity ████▇▇▇▇▇▆▆▆▆▆▆▆▆▆▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁11823.011457.911688.311579.111382.210879.711091.010811.310805.510616.210508.310364.510357.610226.010216.210165.210067.99977.79770.49579.88951.58832.88705.98784.58749.38607.68448.98542.68042.67948.37912.07817.17724.67612.17527.07532.27390.37223.27117.37152.87025.46928.26830.36768.76619.66447.1
 us-gaap:TierOneRiskBasedCapital dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark ntrs:WhollyOwnedSubsidiary,us-gaap:AdvancedApproachNANA10003.3NANANA8476.0NANANA8722.5NANANA8517.8NANANA8201.4NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapital dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark ntrs:WhollyOwnedSubsidiary,us-gaap:StandardizedApproachNANA10003.3NANANA8476.0NANANA8722.5NANANA8517.8NANANA8201.4NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapital dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents ntrs:WhollyOwnedSubsidiary,us-gaap:AdvancedApproach,us-gaap:CommonStockNANA10003.3NANANA8476.0NANANA8722.5NANANA8517.8NANANA8201.4NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapital dei:LegalEntity,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents ntrs:WhollyOwnedSubsidiary,us-gaap:StandardizedApproach,us-gaap:CommonStockNANA10003.3NANANA8476.0NANANA8722.5NANANA8517.8NANANA8201.4NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapital us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark srt:ParentCompany,us-gaap:AdvancedApproachNANA10822.2NANANA10152.0NANANA9596.7NANANA9473.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapital us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark srt:ParentCompany,us-gaap:StandardizedApproachNANA10822.2NANANA10152.0NANANA9596.7NANANA9473.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapital us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents srt:ParentCompany,us-gaap:AdvancedApproach,us-gaap:CommonStockNANA9962.2NANANA8898.7NANANA8729.8NANANA8626.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:TierOneRiskBasedCapital us-gaap:ConsolidatedEntities,us-gaap:ConcentrationRiskByBenchmark,us-gaap:StatementEquityComponents srt:ParentCompany,us-gaap:StandardizedApproach,us-gaap:CommonStockNANA9962.2NANANA8898.7NANANA8729.8NANANA8626.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▃▂▁▃▁█▁▄▆▄▂▄4799.34584.44389.54737.54462.25833.24459.25037.65348.35074.14581.65073.4NANA4518.1NANANA5332.0NANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:PropertyPlantAndEquipmentGross NANA1612.6NANANA1467.4NANANA1317.0NANANA1335.6NANANA1236.4NANANA1137.9NANANA1061.3NANANA1177.3NANANA1129.9NANANA1058.2NANANA879.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingNANA257.8NANANA305.8NANANA245.7NANANA260.4NANANA247.2NANANA239.2NANANA232.8NANANA255.6NANANA258.0NANANA252.2NANANA201.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:EquipmentNANA816.4NANANA731.0NANANA649.9NANANA590.5NANANA524.8NANANA450.7NANANA392.2NANANA488.7NANANA437.1NANANA391.0NANANA342.0NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandImprovementsNANA14.5NANANA14.5NANANA15.4NANANA15.3NANANA26.5NANANA26.5NANANA26.5NANANA27.1NANANA31.8NANANA32.6NANANA33.5NANANA
 us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA523.9NANANA416.1NANANA406.0NANANA389.4NANANA357.9NANANA341.5NANANA327.3NANANA323.4NANANA320.5NANANA298.5NANANA218.6NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment NANA1097.7NANANA984.1NANANA888.8NANANA871.0NANANA769.8NANANA691.0NANANA617.0NANANA718.5NANANA660.0NANANA563.7NANANA374.5NANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType us-gaap:BuildingNANA163.0NANANA156.0NANANA148.2NANANA144.1NANANA134.7NANANA126.3NANANA117.5NANANA134.1NANANA133.9NANANA127.0NANANA70.6NANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType us-gaap:EquipmentNANA596.8NANANA521.5NANANA457.6NANANA405.1NANANA344.4NANANA289.3NANANA234.7NANANA320.8NANANA268.1NANANA209.1NANANA160.0NANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType us-gaap:LandImprovementsNANA0.5NANANA0.5NANANA1.1NANANA1.0NANANA0.8NANANA0.7NANANA0.7NANANA0.6NANANA0.6NANANA0.8NANANA0.6NANANA
 us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType us-gaap:LeaseholdImprovementsNANA337.4NANANA306.1NANANA281.9NANANA263.2NANANA236.1NANANA222.9NANANA212.1NANANA213.3NANANA210.1NANANA180.5NANANA99.4NANANA
us-gaap:AmortizationOfIntangibleAssets ▁▆▆▆▅▃▃▅▃▅▅▆▇█3.94.34.34.34.24.14.14.24.14.24.24.34.44.5NANANANANANANANANANANANANANANANANANANANANANANA4.66.05.32.93.33.43.53.54.0
us-gaap:PropertyPlantAndEquipmentNet ▇▇██▇▆▆▁▁▂▃▂▃▄▅▅▅▅▅▃▃▃▄▃▃▄▄▃▄▄▅▄▄▄▅▄▅▆▇▇▇▇▇496.5496.7514.9510.0501.0490.2483.3400.5407.5411.5428.2417.2428.8442.6464.6462.5463.3459.9466.6438.8434.0437.8446.9427.7436.5442.4444.3436.6441.9449.4458.8444.3454.5457.2469.9453.7462.0481.2494.5492.1495.7494.7504.5NANANA
us-gaap:Goodwill ███████▇▇▇▇▇▇▆▆▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▂▁▁709.4704.0707.2698.0690.6689.3696.8687.2682.0683.0669.3672.7673.5611.6605.6526.5523.1519.3519.4524.4527.8523.6526.4529.7534.3527.3533.2538.1544.6541.6540.7537.7530.4529.5537.8538.0533.2536.5532.0534.1434.9405.8400.9NANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▅▅▅▅▅▅▆▆▆▆▇▇▇██▁▁▁▁▁▂▁▁▂▂▂▂▃▃▃▄▄▄▄▅▅▅▆▆▆▄100.9103.8112.6112.6112.7114.6120.6121.5130.0132.4138.6144.6149.1160.3161.437.939.741.141.845.447.145.346.549.251.252.660.065.873.078.283.087.892.597.0104.0108.6112.2120.0123.4130.093.2NA53.2NANANA
us-gaap:OperatingLeaseRightOfUseAsset NANA560.5NANANA491.6466.5436.5460.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA92.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA85.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA74.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA77.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA372.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ████▇▇▇▇▇▆▆▆▆▆▆▆▆▆▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁11823.011457.911688.311579.111382.210879.711091.010811.310805.510616.210508.310364.510357.610226.010216.210165.210067.99977.79770.49579.88951.58832.88705.98784.58749.38607.68448.98542.68042.67948.37912.07817.17724.67612.17527.07532.27390.37223.27117.37152.87025.46928.26830.36768.76619.66447.1
us-gaap:AdditionalPaidInCapital ▁▁▃▃▃▂▅▅▅▅█▇▇▆▇▆▆▅▆▇▇▆█▇▇▆▇▇921.1914.1963.6961.8951.5938.31013.11009.71013.81003.31068.51055.31050.21020.41047.21037.51027.01010.21035.81038.61040.21022.11072.31058.71044.61024.91050.91055.5NANA1035.7NANANANANANANANANANA932.8920.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▇▇▇▆▆▆▆▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁12630.912415.612207.712118.311988.411828.111656.711441.211225.510972.910776.810496.310262.59973.89685.19431.29247.59074.48908.48736.18566.38394.88242.88093.77949.87771.77625.47469.47344.17241.47134.87040.16909.26793.86702.76607.96502.26323.56302.36240.36138.36054.55972.1NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▆▅███▅▃▄▄▂▂▁▁▁▂▂▂▂▂▃▃▃▂▃▃▃▃▃▃▃▃▂▂▃▃▃▃▃▂▃▃▃▃▃▃▂194.765.9428.0424.5370.445.0-194.7-91.0-159.8-345.3-453.7-526.9-508.1-505.7-414.3-335.1-338.9-352.0-370.0-259.7-239.6-283.9-372.7-273.7-273.7-266.4-319.7-218.4-205.2-236.1-244.3-337.9-350.7-284.1-283.0-215.9-274.1-276.3-345.6-232.5-243.3-279.6-305.3-266.1-315.3-332.5
us-gaap:TreasuryStockValue ███████▇▆▆▆▅▅▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁3217.23231.23204.53219.03221.63225.23066.12839.22564.62305.32173.91950.81737.61553.11392.41259.01158.31045.51094.41225.81212.51097.31033.6891.3768.5719.7704.8561.0544.2488.5422.8325.5256.8301.4314.0273.2241.7214.5225.5226.5227.1188.1165.1NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▄▆▄█▁▆▅▄▅▅▆▅▄▅▅▄▅▅▆▄▄▆▃▅▅▄▄▅▅▄▇▂▅▄▅▄▅▆▃▅▄▄▄▅▄-1236.068.31476.3-77.93183.7-2685.31636.4577.184.8293.7459.11453.9332.3-477.8850.7557.1-472.1784.7838.51184.6-214.0-299.11350.6-1043.41036.4490.8-337.5-266.51001.5538.5-121.62242.6-1594.2312.523.2251.9-218.3757.61391.3-700.2490.372.9-129.2152.0732.634.8
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▇▂▆▇▁▃▆▅█▅▆▄█▄▄▅▆▅▅▄▆▆▅▃▆▆▄▅▅▄▅▅▆▅▆▅▇▄▆▅▄▅▅▅▇-7365.35133.7-16808.51176.87209.0-21500.3-12403.41667.1-4276.311607.6-1021.11730.7-7538.711156.2-8055.9-5667.7-1324.51026.5-4939.4-322.3-5583.6653.23609.9-2849.9-10466.62805.9853.5-5981.3-2262.5-822.1-6193.3-2201.1-1727.84438.9-3705.3724.0-3294.27903.1-6472.12215.9-3126.5-8005.7-4072.4-477.1-2724.55506.0
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▂▆▃▁█▅▃▄▁▃▃▄▁▄▄▄▃▄▃▄▃▃▃▆▃▃▄▃▃▄▃▂▄▄▃▄▂▄▃▄▅▄▃▄▂8800.7-4905.614839.6-838.3-11837.425708.010114.8-2483.54431.0-11446.477.8-2939.66210.8-9167.26436.14632.52891.7-2707.64715.4-1307.34125.43.4-3035.31339.512421.2-2191.3-417.45276.11426.9788.16814.1-1989.3-5104.14667.63978.6-1173.52909.3-8787.35155.4-2061.64025.28684.63461.4152.82896.8-5365.9
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▅▅▄▅▁█▃▄▅▆▃214.9194.9-348.0275.3-1371.01374.0-578.4-310.7274.2492.5-491.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet █▂▃▇▅▂▅▃▅▆▂▃▃▆▂▄█▅▁▄▃▆▄▅▅▅▅▅▃▄▄▄▅▃▅▅▅▂▃▃▄▅▃▅▅▃626.3-462.0-189.5548.6113.4-456.1203.0-249.4126.3368.3-435.7-294.3-242.3242.4-461.2-122.6713.7172.2-669.1-104.7-222.7343.1-12.164.8113.9151.5134.7108.9-302.9-26.8-109.8-85.1173.8-188.4200.0116.486.6-407.3-220.5-315.118.232.5-184.6179.569.2-206.5
us-gaap:NetCashProvidedByUsedInOperatingActivities ▃▄▆▄█▁▆▅▄▅▅▆▅▄▅▅▄▅▅▆▄▄▆▃▅▅▄▄▅▅▄▇▂▅▄▅▄▅▆▃▅▄▄▄▅▄-1236.068.31476.3-77.93183.7-2685.31636.4577.184.8293.7459.11453.9332.3-477.8850.7557.1-472.1784.7838.51184.6-214.0-299.11350.6-1043.41036.4490.8-337.5-266.51001.5538.5-121.62242.6-1594.2312.523.2251.9-218.3757.61391.3-700.2490.372.9-129.2152.0732.634.8
us-gaap:NetIncomeLoss ▇▇▄▅▆▇▇▇▇▆█▇█▇▇▅▄▅▄▄▄▄▄▄▄▄▄▃▂▂▂▃▃▂▂▂▂▂▁▂▂▂▂▂▃▂368.1375.1240.9294.5313.3360.6371.1384.6389.4347.1409.9374.5390.4381.6356.6298.4267.9276.1266.5257.6260.7241.8239.3234.6269.2230.7244.0204.5181.9181.4169.7206.5191.1164.0167.7178.8179.6161.2130.2170.4152.0151.0157.1155.6199.6157.2
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▇▂▆▇▁▃▆▅█▅▆▄█▄▄▅▆▅▅▄▆▆▅▃▆▆▄▅▅▄▅▅▆▅▆▅▇▄▆▅▄▅▅▅▇-7365.35133.7-16808.51176.87209.0-21500.3-12403.41667.1-4276.311607.6-1021.11730.7-7538.711156.2-8055.9-5667.7-1324.51026.5-4939.4-322.3-5583.6653.23609.9-2849.9-10466.62805.9853.5-5981.3-2262.5-822.1-6193.3-2201.1-1727.84438.9-3705.3724.0-3294.27903.1-6472.12215.9-3126.5-8005.7-4072.4-477.1-2724.55506.0
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▃▁▃▂▃▃█▂▂▁▅▂▂▁▂▂▂▂▄▂▂▁▄▁▂▂▃▂▂▂▄▁▂▁▄▁▁▁▃▃▂▁▃▃▁▂28.410.733.226.039.037.6108.222.118.69.158.615.717.36.027.923.625.814.353.326.020.012.043.212.717.125.530.918.618.913.548.112.119.811.945.411.07.09.941.830.016.28.931.928.310.919.4
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▂▆▃▁█▅▃▄▁▃▃▄▁▄▄▄▃▄▃▄▃▃▃▆▃▃▄▃▃▄▃▂▄▄▃▄▂▄▃▄▅▄▃▄▂8800.7-4905.614839.6-838.3-11837.425708.010114.8-2483.54431.0-11446.477.8-2939.66210.8-9167.26436.14632.52891.7-2707.64715.4-1307.34125.43.4-3035.31339.512421.2-2191.3-417.45276.11426.9788.16814.1-1989.3-5104.14667.63978.6-1173.52909.3-8787.35155.4-2061.64025.28684.63461.4152.82896.8-5365.9
us-gaap:PaymentsOfDividendsCommonStock ███████▇▇▇▇▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▁█▄▄▄▄▄▄▄▄▄▄▄145.8145.9145.8145.8145.9147.1148.7129.1131.1120.8121.894.094.695.095.687.087.386.986.181.882.382.883.683.777.177.077.575.574.975.074.374.570.71.1144.873.468.667.568.268.468.568.668.669.167.867.7
us-gaap:PaymentsForRepurchaseOfCommonStock ▂▄▁▁▁█▇█▇▇▆▆▅▇▅▄▅▃▂▂▄▄▄▄▃▃▅▃▃▅▄▃▁▃▂▂▂▁▁▁▂▂▁▁▁▁30.2135.61.31.50.2296.8264.4307.2271.2257.4234.6235.9190.6263.2170.6124.8157.670.165.065.0140.8140.3152.5140.596.7107.2165.577.374.9163.0122.997.315.374.262.549.735.814.41.31.340.236.2-0.12.10.13.8
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Par Or Stated Value Per Share

us-gaap:CommonStockParOrStatedValuePerShare

us-gaap:CommonStockParOrStatedValuePerShare


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312009-05-01
Value1.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.66671.671.66671.66671.6667
Percentage of CommonStockParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value209208208208209214217219223225227229230230228229229234235235237237239241241240240241241241241242242242242
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value208208208208208213216218222224225228229229226227228232233233235236237239239239240240241240241242242242241
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.731.711.131.321.471.561.711.71.761.491.811.591.691.591.521.211.121.11.121.091.11.011.00.971.110.950.980.850.760.750.70.850.780.680.690.730.730.660.530.70.620.620.640.640.820.65
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.721.71.121.321.461.551.711.691.751.481.81.581.681.581.511.21.121.091.111.081.091.010.990.961.10.940.980.840.750.750.70.840.780.670.690.730.730.660.540.70.620.610.640.640.820.64
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Tier One Risk Based Capital To Risk Weighted Assets

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets

ntrs:WhollyOwnedSubsidiary, us-gaap:AdvancedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value13.80.130.1410.1370.124
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets100.0100.0100.0100.0100.0

ntrs:WhollyOwnedSubsidiary, us-gaap:StandardizedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value13.00.1230.1310.1260.115
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets94.294.692.992.092.7

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents

ntrs:WhollyOwnedSubsidiary, us-gaap:AdvancedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value13.80.130.1410.1370.124
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets100.0100.0100.0100.0100.0

ntrs:WhollyOwnedSubsidiary, us-gaap:StandardizedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value13.00.1230.1310.1260.115
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets94.294.692.992.092.7

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark

srt:ParentCompany, us-gaap:AdvancedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value14.50.150.150.148
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets105.1115.4106.4108.0

srt:ParentCompany, us-gaap:StandardizedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value13.90.1450.1410.138
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets100.7111.5100.0100.7

us-gaap:TierOneRiskBasedCapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents

srt:ParentCompany, us-gaap:AdvancedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value13.40.1320.1370.135
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets97.1101.597.298.5

srt:ParentCompany, us-gaap:StandardizedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value12.80.1270.1290.126
Percentage of TierOneRiskBasedCapitalToRiskWeightedAssets92.897.791.592.0

Capital To Risk Weighted Assets

us-gaap:CapitalToRiskWeightedAssets dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark

us-gaap:CapitalToRiskWeightedAssets

ntrs:WhollyOwnedSubsidiary, us-gaap:AdvancedApproach


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value15.00.1460.1580.1540.14
Percentage of CapitalToRiskWeightedAssets100.0100.0100.0100.0100.0

ntrs:WhollyOwnedSubsidiary, us-gaap:StandardizedApproach


Capital
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value14.50.140.1480.1430.133
Percentage of CapitalToRiskWeightedAssets96.795.993.792.995.0

us-gaap:CapitalToRiskWeightedAssets us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark

srt:ParentCompany, us-gaap:AdvancedApproach


Capital
Period End2020-12-312019-12-312018-12-312017-12-31
Value15.90.1680.1690.167
Percentage of CapitalToRiskWeightedAssets106.0115.1107.0108.4

srt:ParentCompany, us-gaap:StandardizedApproach


Capital
Period End2020-12-312019-12-312018-12-312017-12-31
Value15.60.1630.1610.158
Percentage of CapitalToRiskWeightedAssets104.0111.6101.9102.6

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value18508.613155316171855211933562121285620202025171619221618202317171820151617241515152211111117
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating5.514.42.43.93.710.22.92.82.98.33.33.35.811.24.54.86.913.65.65.85.87.35.35.56.67.75.46.16.97.85.76.16.67.25.35.15.37.14.54.54.46.63.53.53.75.6

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

us-gaap:EmployeeStockOption


Allocated
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.10.10.10.20.30.40.20.50.60.50.70.80.80.91.06.30.90.90.86.41.01.31.76.02.12.22.16.43.53.74.36.9
Percentage of AllocatedShareBasedCompensationExpense1.20.70.70.41.82.31.10.92.82.62.11.43.74.23.511.24.44.44.024.85.77.78.926.212.812.210.427.720.520.723.533.7
Percentage of InterestAndDividendIncomeOperating0.00.00.00.00.10.10.00.10.10.10.10.20.20.20.21.50.20.30.21.80.30.40.62.00.70.70.72.21.21.31.62.4
Percentage of InterestAndDividendIncomeOperating us-gaap:EmployeeStockOption0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PerformanceShares


Allocated
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value3.6121.61.6122.93.2153.5149.04.9128.54.54.54.13.74.13.4
Percentage of AllocatedShareBasedCompensationExpense19.124.011.510.624.016.817.128.217.943.415.922.742.015.222.122.515.922.021.414.8
Percentage of InterestAndDividendIncomeOperating1.03.50.50.42.40.50.52.40.62.51.81.12.92.11.31.31.21.21.41.1
Percentage of InterestAndDividendIncomeOperating us-gaap:PerformanceShares0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value15381112134012141539161518461415154115151415121113131112141411121112
Percentage of AllocatedShareBasedCompensationExpense80.976.0137.287.888.775.777.780.981.870.973.779.554.582.767.473.154.573.673.873.573.559.373.170.269.859.068.370.673.861.067.867.665.060.5
Percentage of InterestAndDividendIncomeOperating4.411.03.33.43.37.72.22.32.45.92.52.63.29.23.03.53.710.04.14.34.34.33.93.94.64.53.74.35.14.83.84.24.34.3
Percentage of InterestAndDividendIncomeOperating us-gaap:RestrictedStockUnitsRSU0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:TitleOfIndividual, us-gaap:AwardType

ntrs:RetirementEligibleEmployees, us-gaap:PerformanceShares


Allocated
Period End2021-03-312020-03-312019-06-302019-03-312018-06-30
Value9.9100.09.210
Percentage of AllocatedShareBasedCompensationExpense19.620.10.016.631.9
Percentage of InterestAndDividendIncomeOperating2.82.00.01.41.9
Percentage of InterestAndDividendIncomeOperating ntrs:RetirementEligibleEmployees us-gaap:PerformanceShares0.00.00.00.00.0

ntrs:RetirementEligibleEmployees, us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-03-312020-03-312019-03-31
Value214.33.3
Percentage of AllocatedShareBasedCompensationExpense43.28.06.0
Percentage of InterestAndDividendIncomeOperating6.20.80.5
Percentage of InterestAndDividendIncomeOperating ntrs:RetirementEligibleEmployees us-gaap:RestrictedStockUnitsRSU0.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4961324434863860026745357445548335538831527730228129415623730533014023426128414219121218926321912416210023718123017181188176117204216186
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating144.83.769.398.1157.2113.446.473.089.868.774.559.468.362.456.866.667.471.742.168.088.593.942.476.790.795.047.065.172.464.287.175.345.256.833.373.456.567.64.852.252.350.935.362.068.259.3

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value486495373389403461476508506452485481507483435416390390389373394359350353411350345304270269245301285242223266266236171252229230214237299
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating141.8141.7105.9109.799.287.182.781.979.268.274.980.389.395.689.291.893.795.3105.0107.0114.5102.0106.0115.5142.5117.1113.8103.592.191.281.2103.6103.884.673.982.482.869.448.372.863.866.364.171.994.3

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11812013295891001051241171057610611610279118122114123116134117111118142119101998888769594785587867541827779578110081
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating34.534.537.626.822.119.018.320.018.415.911.717.820.620.216.226.029.528.033.233.238.933.433.638.849.239.933.533.930.229.825.132.634.427.418.427.026.922.211.623.721.522.817.124.831.525.8

Income Taxes Paid

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value15830637411772761272052714115117129923626843157183198215-136.930218340119855915789277142498614.82945661136103
Percentage of IncomeTaxesPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating46.38.817.921.028.813.713.320.532.14.121.825.330.15.918.98.164.410.642.452.557.661.1-41.499.163.613.639.329.120.15.125.931.728.15.18.030.419.11.48.413.118.63.310.931.3

Interest And Fee Income Loans And Leases

us-gaap:InterestAndFeeIncomeLoansAndLeases

us-gaap:InterestAndFeeIncomeLoansAndLeases


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value172172168167189250263291300298292282271252241239224213202202201200190186171183182184185182184185185187198206205217219229243246245231226224
Percentage of InterestAndFeeIncomeLoansAndLeases100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating50.249.247.747.046.547.345.846.947.045.045.147.247.849.849.652.853.852.054.557.958.457.157.561.159.261.560.062.963.261.961.063.767.465.465.664.064.063.861.866.267.671.073.570.271.271.4

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7.59.818263412115520322224023119115412110899755646464544413637384044474952545560677767848390113112112968583
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.22.85.27.58.422.927.032.734.836.335.731.927.224.122.121.918.113.812.613.213.112.612.512.013.012.813.215.116.116.817.418.620.121.122.524.021.024.823.426.031.632.533.629.326.826.7

Interest Income Expense Net

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value335340334328372408420417417422417408413384380354341353324303299307289268251260263249246245249237220226234245254256271256246234222233232230
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating97.897.294.892.591.677.173.067.365.263.764.368.172.875.977.978.181.986.287.486.886.987.487.588.087.087.286.884.983.983.282.681.479.978.977.576.079.075.276.674.068.467.566.470.773.273.3

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value152.2361548126169206225244228178147116113
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating4.40.610.44.411.823.929.433.335.136.835.329.726.022.923.3

Marketing And Advertising Expense

us-gaap:MarketingAndAdvertisingExpense

us-gaap:MarketingAndAdvertisingExpense


Marketing
Period End2021-06-302021-03-312020-06-302020-03-31
Value8.97.97.918
Percentage of MarketingAndAdvertisingExpense100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2.62.31.93.6

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value368375240294313360371384389347409374390381356298267276266257260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating107.3107.268.382.977.168.164.462.060.852.463.262.568.875.473.165.864.267.371.873.875.668.772.476.793.277.280.369.661.961.456.170.969.457.255.555.355.947.336.749.142.343.547.047.162.850.0

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value16115886113143177164185191
Percentage of NetIncomeLoss43.942.236.038.445.749.344.348.149.3
Percentage of InterestAndDividendIncomeOperating47.145.224.631.835.233.628.529.830.0
Percentage of InterestAndDividendIncomeOperating ntrs:CorporateAndInstitutionalServiceSegment0.00.00.00.00.00.00.00.00.0

ntrs:TreasuryAndOtherSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-20.4-3.7-15.6-4.8-13.4-6.8-4.4-6.0-2.9
Percentage of NetIncomeLoss-5.5-1.0-6.5-1.6-4.3-1.9-1.2-1.6-0.7
Percentage of InterestAndDividendIncomeOperating-5.9-1.1-4.4-1.4-3.3-1.3-0.8-1.0-0.5
Percentage of InterestAndDividendIncomeOperating ntrs:TreasuryAndOtherSegment0.00.00.00.00.00.00.00.00.0

ntrs:WealthManagementSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value226220169186183189211205200
Percentage of NetIncomeLoss61.658.870.563.258.652.656.953.551.5
Percentage of InterestAndDividendIncomeOperating66.163.048.252.445.235.836.733.131.3
Percentage of InterestAndDividendIncomeOperating ntrs:WealthManagementSegment0.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value368375294313360384389347409374390381356298267276266263260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating107.3107.282.977.168.162.060.852.463.262.568.875.473.165.864.267.371.875.575.668.772.476.793.277.280.369.661.961.456.170.969.457.255.555.355.947.336.749.142.343.547.047.162.850.0
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value363358236278308330365367383329404357384364350281262255260251254235233228263224234204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating105.9102.667.078.375.962.463.459.159.949.862.359.667.772.071.961.962.862.270.372.173.967.070.674.891.275.277.269.661.961.456.170.969.457.255.555.355.947.336.749.142.343.547.047.162.850.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value360355234275305326361362379325398353379359345276257250255247250231229225259221230201178178167203187161165176176160128168150149155154198155
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating105.0101.566.677.475.161.662.758.459.349.161.458.966.871.070.761.061.761.268.970.772.665.969.473.689.874.075.968.460.960.455.269.768.356.354.754.555.046.936.248.541.843.046.646.762.349.6

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value2.15.0-2.61.82.025119.91414111013-13.16.23.64.92.0-1.6-9.56.33.9-13.5-2.35.8-5.91.7-3.6-5.6-1.3-0.6-4.45.8-4.2-4.114-5.915-13.11.22.2
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating0.61.4-0.70.50.54.91.91.62.22.21.71.82.4-2.61.30.81.20.5-0.4-2.71.81.1-4.1-0.82.0-2.00.6-1.2-1.9-0.4-0.2-1.52.1-1.5-1.44.4-1.84.6-3.70.30.6

Preferred Stock Dividends Income Statement Impact

us-gaap:PreferredStockDividendsIncomeStatementImpact

us-gaap:PreferredStockDividendsIncomeStatementImpact


Preferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value4.7164.7164.8305.8175.9175.9175.9175.9175.9205.85.95.85.95.95.85.85.99.50.0
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of InterestAndDividendIncomeOperating1.44.61.34.61.25.81.02.80.92.60.92.91.03.41.23.81.45.01.61.71.71.71.81.92.02.03.10.0

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

us-gaap:RealizedInvestmentGainsLosses


Realized
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-500000.00100000.0-500000.0-400000.0-300000.0500000.0700000.0-1400000.0700000.0300000.0-400000.00500000.00
Percentage of RealizedInvestmentGainsLosses100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0
Percentage of InterestAndDividendIncomeOperating-0.10.00.0-0.1-0.1-0.00.20.2-0.40.20.1-0.10.00.20.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value10751063102610039611003992975955928933939942924981955867899973
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating313.4304.0291.0282.4236.6189.6172.2157.1149.3140.1144.0156.7166.1260.7282.7265.6259.4272.3306.3

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

ntrs:CustodyandFundAdministration


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value479469442416397417416414407397398396399395
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax44.644.243.141.541.441.642.042.542.642.842.642.242.30.0
Percentage of InterestAndDividendIncomeOperating139.7134.2125.5117.297.978.972.366.863.660.061.466.170.378.3
Percentage of InterestAndDividendIncomeOperating ntrs:CustodyandFundAdministration0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:InvestmentManagementandAdvisory


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value521516514519485510501491478459463468465465
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.548.550.151.750.550.950.650.450.049.449.649.949.30.0
Percentage of InterestAndDividendIncomeOperating151.9147.6145.8146.1119.596.587.179.274.769.371.578.281.992.0
Percentage of InterestAndDividendIncomeOperating ntrs:InvestmentManagementandAdvisory0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:OtherTrustInvestmentAndOtherServicingFees


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5559514851525049484950504850
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.25.65.04.85.35.25.15.05.05.35.45.45.10.0
Percentage of InterestAndDividendIncomeOperating16.216.914.713.612.69.88.87.97.57.57.88.48.59.9
Percentage of InterestAndDividendIncomeOperating ntrs:OtherTrustInvestmentAndOtherServicingFees0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:ProductsandServicesOtherOperatingIncome


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1212111010.0101010109.910101111
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.21.21.11.11.01.11.11.11.11.11.11.11.20.0
Percentage of InterestAndDividendIncomeOperating3.73.73.23.02.52.01.91.71.61.51.61.72.02.2
Percentage of InterestAndDividendIncomeOperating ntrs:ProductsandServicesOtherOperatingIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:SecuritiesCommissionandTrading


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2728252126292223192120192224
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.52.72.52.22.72.92.32.42.12.32.22.12.40.0
Percentage of InterestAndDividendIncomeOperating7.98.27.26.16.45.54.03.83.13.23.23.33.94.7
Percentage of InterestAndDividendIncomeOperating ntrs:SecuritiesCommissionandTrading0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

ntrs:SecuritiesLending


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1918171927232220222221243026
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.71.72.02.82.32.32.12.32.52.32.63.20.0
Percentage of InterestAndDividendIncomeOperating5.75.25.05.66.74.44.03.23.43.43.44.15.45.2
Percentage of InterestAndDividendIncomeOperating ntrs:SecuritiesLending0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value611620596584566574567559549
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax56.958.358.158.358.957.257.157.457.5
Percentage of InterestAndDividendIncomeOperating178.2177.3169.1164.6139.4108.598.490.285.8
Percentage of InterestAndDividendIncomeOperating ntrs:CorporateAndInstitutionalServiceSegment0.00.00.00.00.00.00.00.00.0

ntrs:WealthManagementSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value463443430418395429425415406
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax43.141.741.941.741.142.842.942.642.5
Percentage of InterestAndDividendIncomeOperating135.2126.7122.0117.997.381.173.866.963.4
Percentage of InterestAndDividendIncomeOperating ntrs:WealthManagementSegment0.00.00.00.00.00.00.00.00.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value1075106331311003961100332139759559283140939942924981955867899973
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating313.4304.0888.2282.4236.6189.6557.8157.1149.3140.1484.2156.7166.1260.7282.7265.6259.4272.3306.3

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value17229116392417000315208215143216170913682812435512655012186913221213237813510612967213859013140012560512148812392612008512150911779811674911999511994210695210994611115310576110383210294795969972369315697463936329445591604100223960989739892679838438214182053
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets ntrs:LeveragedLeases, us-gaap:ConsolidatedEntities

ntrs:LeveragedLeases, us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsntrs:
Period End2020-12-312019-12-31
Value1142
Percentage of Assets0.00.0
Percentage of Assets0.00.0
Percentage of Assets ntrs:LeveragedLeases us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0

us-gaap:Assets ntrs:LeveragedLeases, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

ntrs:LeveragedLeases, us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsntrs:
Period End2020-09-302020-06-302019-12-31
Value303042
Percentage of Assets0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets ntrs:LeveragedLeases us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0100.0

us-gaap:Assets us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:OtherAssets, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Assetsus-gaap:
Period End2020-09-302020-06-302019-12-31
Value715678700
Percentage of Assets0.50.40.5
Percentage of Assets0.50.40.5
Percentage of Assets us-gaap:OtherAssets us-gaap:VariableInterestEntityNotPrimaryBeneficiary100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value17059158861434813620
Percentage of Assets10.011.610.99.8
Percentage of Assets10.011.610.99.8
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, us-gaap:OtherAssets


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value860863874700
Percentage of Assets0.50.50.50.5
Percentage of Assets0.50.50.50.5
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary us-gaap:OtherAssets100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementGeographical

us-gaap:DomesticCountry


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value131610108939994991082659898286113816207270668265715985937162888
Percentage of Assets77.479.675.378.179.973.874.270.670.071.470.876.6
Percentage of Assets77.479.675.378.179.973.874.270.670.071.470.876.6
Percentage of Assets us-gaap:DomesticCountry100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCountry


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value38393278883271230325249443063628326302412919828625244721925324433
Percentage of Assets22.620.424.721.920.126.225.829.430.028.629.223.429.8
Percentage of Assets22.620.424.721.920.126.225.829.430.028.629.223.429.8
Percentage of Assets us-gaap:ForeignCountry100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1604681524661583151405021400501508291257371135441157451112531217041220141247481194461283741212351155371115111141561105051125581089661080431112101111939834410149710261197718958849503588152895118554489936861008706584381931068894590372857517701375829
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets93.193.093.192.492.593.391.991.391.591.392.192.292.392.192.692.392.091.892.192.092.692.592.592.792.792.092.392.392.492.392.391.992.191.892.392.092.292.192.992.692.892.591.992.3

us-gaap:Liabilities us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:OtherLiabilities, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2020-09-302020-06-302019-12-31
Value283301354
Percentage of Liabilities0.20.20.3
Percentage of Assets0.20.20.3
Percentage of Assets us-gaap:OtherLiabilities us-gaap:VariableInterestEntityNotPrimaryBeneficiary0.00.00.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value5371479538393403
Percentage of Liabilities3.43.83.22.7
Percentage of Assets3.23.52.92.5
Percentage of Assets srt:ParentCompany31.530.226.825.0

us-gaap:Liabilities us-gaap:ConsolidatedEntities, us-gaap:BalanceSheetLocation

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, us-gaap:OtherLiabilities


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312019-12-31
Value250298335354
Percentage of Liabilities0.20.20.20.3
Percentage of Assets0.10.20.20.3
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary us-gaap:OtherLiabilities0.00.00.00.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value172291163924170003152082151432161709136828124355126550121869132212132378135106129672138590131400125605121488123926120085121509117798116749119995119942106952109946111153105761103832102947959699723693156974639363294455916041002239609897398926798384382141
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value17059158861434813620
Percentage of LiabilitiesAndStockholdersEquity10.011.610.99.8
Percentage of Assets10.011.610.99.8
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value11823114571168811579113821087911091108111080510616105081036410357102261021610165100679977977095798951883287058784874986078448854280427948791278177724761275277532739072237117715270256928683067686619644763126389
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.97.06.97.67.56.78.18.78.58.77.97.87.77.97.47.78.08.27.98.07.47.57.57.37.38.07.77.77.67.77.78.17.98.27.78.07.87.97.17.47.27.58.10.00.00.07.77.8

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value11688110911050810216
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets6.98.17.97.4
Percentage of Assets srt:ParentCompany68.569.873.275.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-324.7-347.5-355.3-389.7-407.2-415.8-422.8-389.9-394.2-398.4-410.7-378.1-385.0-392.4-342.2-314.6-318.9-323.2-325.2-309.7-313.0-317.0-321.1-322.5-328.6-340.9-260.3
Percentage of StockholdersEquity-2.7-3.0-3.0-3.4-3.6-3.8-3.8-3.6-3.6-3.8-3.9-3.6-3.7-3.8-3.3-3.1-3.2-3.2-3.3-3.2-3.5-3.6-3.7-3.7-3.8-4.0-3.3
Percentage of Assets-0.2-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value-5.4-8.4-3.21.60.33.6-3.72.14.5-0.34.0-6.0-1.81.74.56.1-3.0
Percentage of StockholdersEquity-0.0-0.1-0.00.00.00.0-0.00.00.0-0.00.0-0.1-0.00.00.00.1-0.0
Percentage of Assets-0.0-0.0-0.00.00.00.0-0.00.00.0-0.00.0-0.0-0.00.00.00.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value373272641665631313114190133-29.3-114.9-199.6-167.5-147.6-74.8-13.7-11.5-13.1-32.4637743-31.05259276.0
Percentage of StockholdersEquity3.22.45.55.75.62.91.01.81.2-0.3-1.1-1.9-1.6-1.4-0.7-0.1-0.1-0.1-0.30.70.90.5-0.40.60.70.30.1
Percentage of Assets0.20.20.40.40.40.20.10.20.1-0.0-0.1-0.2-0.1-0.1-0.1-0.0-0.0-0.0-0.00.10.10.0-0.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1946542842437045-194.7-91.0-159.8-345.3-453.7-526.9-508.1-505.7-414.3-335.1-338.9-352.0-370.0-259.7-239.6-283.9-372.7-273.7-273.7-266.4-319.7-218.4-205.2-236.1-244.3-337.9-350.7-284.1-283.0-215.9-274.1-276.3-345.6-232.5-243.3-279.6-305.3-266.1-315.3-332.5-361.6-494.9-90.3
Percentage of StockholdersEquity1.60.63.73.73.30.4-1.8-0.8-1.5-3.3-4.3-5.1-4.9-4.9-4.1-3.3-3.4-3.5-3.8-2.7-2.7-3.2-4.3-3.1-3.1-3.1-3.8-2.6-2.6-3.0-3.1-4.3-4.5-3.7-3.8-2.9-3.7-3.8-4.9-3.3-3.5-4.0-4.5-3.9-4.8-5.2-5.7-7.70.0
Percentage of Assets0.10.00.30.30.20.0-0.1-0.1-0.1-0.3-0.3-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.4-0.4-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.40.00.00.0-0.4-0.60.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value151149144147145143117106968267564632-1.8-8.0-11.6-16.5-18.5-16.9-7.4-13.7-17.6-4.1-1.8-1.77.1
Percentage of StockholdersEquity1.31.31.21.31.31.31.11.00.90.80.60.50.40.3-0.0-0.1-0.1-0.2-0.2-0.2-0.1-0.2-0.2-0.0-0.0-0.00.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value9219149639619519381013100910131003106810551050102010471037102710101035103810401022107210581044102410501055103910221035103110149951012100499598197796294893292091190589588817869
Percentage of StockholdersEquity7.88.08.28.38.48.69.19.39.49.510.210.210.110.010.310.210.210.110.610.811.611.612.312.111.911.912.412.412.912.913.113.213.113.113.513.313.513.613.713.513.513.513.513.513.713.914.12.80.0
Percentage of Assets0.50.60.60.60.60.60.70.80.80.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.00.91.01.01.01.11.01.11.01.11.11.11.01.01.01.01.10.00.00.01.10.20.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408379379
Percentage of StockholdersEquity3.53.63.53.53.63.83.73.83.83.83.93.93.94.04.04.04.14.14.24.34.64.64.74.74.74.74.84.85.15.15.25.25.35.45.45.45.55.75.75.75.85.96.06.06.26.36.55.90.0
Percentage of Assets0.20.20.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.00.00.00.50.50.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-312012-12-312008-12-31
Value88488488488488488412738828828828828828828828828828828828828823883883883883883880.00.01501
Percentage of StockholdersEquity7.57.77.67.67.88.111.58.28.28.38.48.58.58.68.68.78.88.89.09.24.34.44.54.44.44.60.00.023.5
Percentage of Assets0.50.50.50.60.60.50.90.70.70.70.70.70.70.70.60.70.70.70.70.70.30.30.30.30.30.40.00.01.8
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value12630124151220712118119881182811656114411122510972107761049610262997396859431924790748908873685668394824280937949777176257469734472417134704069096793670266076502632363026240613860545972588357965665557650914556
Percentage of StockholdersEquity106.8108.4104.4104.7105.3108.7105.1105.8103.9103.4102.6101.399.197.594.892.891.990.991.291.295.795.094.792.190.990.390.387.491.391.190.290.189.489.389.087.788.087.588.587.287.487.487.486.987.687.988.379.70.0
Percentage of Assets7.37.67.28.07.97.38.59.28.99.08.27.97.67.77.07.27.47.57.27.37.07.17.16.76.67.36.96.76.97.06.97.37.17.36.97.16.96.96.36.56.36.57.10.00.00.06.86.20.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-3217.2-3231.2-3204.5-3219.0-3221.6-3225.2-3066.1-2839.2-2564.6-2305.3-2173.9-1950.8-1737.6-1553.1-1392.4-1259.0-1158.3-1045.5-1094.4-1225.8-1212.5-1097.3-1033.6-891.3-768.5-719.7-704.8-561.0-544.2-488.5-422.8-325.5-256.8-301.4-314.0-273.2-241.7-214.5-225.5-226.5-227.1-188.2-165.1-169.3-175.5-189.2-199.2-266.5-405.7
Percentage of StockholdersEquity-27.2-28.2-27.4-27.8-28.3-29.6-27.6-26.3-23.7-21.7-20.7-18.8-16.8-15.2-13.6-12.4-11.5-10.5-11.2-12.8-13.5-12.4-11.9-10.1-8.8-8.4-8.3-6.6-6.8-6.1-5.3-4.2-3.3-4.0-4.2-3.6-3.3-3.0-3.2-3.2-3.2-2.7-2.4-2.5-2.7-2.9-3.2-4.20.0
Percentage of Assets-1.9-2.0-1.9-2.1-2.1-2.0-2.2-2.3-2.0-1.9-1.6-1.5-1.3-1.2-1.0-1.0-0.9-0.9-0.9-1.0-1.0-0.9-0.9-0.7-0.6-0.7-0.6-0.5-0.5-0.5-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.20.00.00.0-0.2-0.30.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Tier One Risk Based Capital

us-gaap:TierOneRiskBasedCapital dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark

us-gaap:TierOneRiskBasedCapital

ntrs:WhollyOwnedSubsidiary, us-gaap:AdvancedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value100038476872285178201
Percentage of TierOneRiskBasedCapital100.0100.0100.0100.0100.0
Percentage of Assets5.96.26.66.16.6
Percentage of Assets ntrs:WhollyOwnedSubsidiary us-gaap:AdvancedApproach0.00.00.00.00.0

ntrs:WhollyOwnedSubsidiary, us-gaap:StandardizedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value100038476872285178201
Percentage of TierOneRiskBasedCapital100.0100.0100.0100.0100.0
Percentage of Assets5.96.26.66.16.6
Percentage of Assets ntrs:WhollyOwnedSubsidiary us-gaap:StandardizedApproach0.00.00.00.00.0

us-gaap:TierOneRiskBasedCapital dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents

ntrs:WhollyOwnedSubsidiary, us-gaap:AdvancedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value100038476872285178201
Percentage of TierOneRiskBasedCapital100.0100.0100.0100.0100.0
Percentage of Assets5.96.26.66.16.6
Percentage of Assets ntrs:WhollyOwnedSubsidiary us-gaap:AdvancedApproach us-gaap:CommonStock0.00.00.00.00.0

ntrs:WhollyOwnedSubsidiary, us-gaap:StandardizedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value100038476872285178201
Percentage of TierOneRiskBasedCapital100.0100.0100.0100.0100.0
Percentage of Assets5.96.26.66.16.6
Percentage of Assets ntrs:WhollyOwnedSubsidiary us-gaap:StandardizedApproach us-gaap:CommonStock0.00.00.00.00.0

us-gaap:TierOneRiskBasedCapital us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark

srt:ParentCompany, us-gaap:AdvancedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value108221015295969473
Percentage of TierOneRiskBasedCapital108.2119.8110.0111.2
Percentage of Assets6.47.47.36.8
Percentage of Assets srt:ParentCompany us-gaap:AdvancedApproach0.00.00.00.0

srt:ParentCompany, us-gaap:StandardizedApproach


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value108221015295969473
Percentage of TierOneRiskBasedCapital108.2119.8110.0111.2
Percentage of Assets6.47.47.36.8
Percentage of Assets srt:ParentCompany us-gaap:StandardizedApproach0.00.00.00.0

us-gaap:TierOneRiskBasedCapital us-gaap:ConsolidatedEntities, us-gaap:ConcentrationRiskByBenchmark, us-gaap:StatementEquityComponents

srt:ParentCompany, us-gaap:AdvancedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value9962889887298626
Percentage of TierOneRiskBasedCapital99.6105.0100.1101.3
Percentage of Assets5.96.56.66.2
Percentage of Assets srt:ParentCompany us-gaap:AdvancedApproach us-gaap:CommonStock0.00.00.00.0

srt:ParentCompany, us-gaap:StandardizedApproach, us-gaap:CommonStock


Tier
Period End2020-12-312019-12-312018-12-312017-12-31
Value9962889887298626
Percentage of TierOneRiskBasedCapital99.6105.0100.1101.3
Percentage of Assets5.96.56.66.2
Percentage of Assets srt:ParentCompany us-gaap:StandardizedApproach us-gaap:CommonStock0.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value47994584438947374462583344595037534850744581507345185332
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.82.82.63.12.93.63.34.14.24.23.53.83.34.3

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1612146713171335123611371061117711291058879947
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.91.11.01.01.01.01.01.11.21.11.01.2

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value257305245260247239232255258252201256
Percentage of PropertyPlantAndEquipmentGross16.020.818.719.520.021.021.921.722.823.822.927.1
Percentage of Assets0.20.20.20.20.20.20.20.20.30.30.20.3
Percentage of Assets us-gaap:Building0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Equipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value816731649590524450392488437391342359
Percentage of PropertyPlantAndEquipmentGross50.649.849.344.242.439.637.041.538.736.938.937.9
Percentage of Assets0.50.50.50.40.40.40.40.50.40.40.40.4
Percentage of Assets us-gaap:Equipment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LandImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value141415152626262731323341
Percentage of PropertyPlantAndEquipmentGross0.91.01.21.12.12.32.52.32.83.13.84.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.1
Percentage of Assets us-gaap:LandImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value523416406389357341327323320298218205
Percentage of PropertyPlantAndEquipmentGross32.528.430.829.228.930.030.827.528.428.224.921.7
Percentage of Assets0.30.30.30.30.30.30.30.30.30.30.30.3
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1097984888871769691617718660563374403
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.70.70.60.60.60.60.70.70.60.40.5

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value1631561481441341261171341331277087
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment14.815.916.716.517.518.319.018.720.322.518.921.7
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:Building0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Equipment


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value596521457405344289234320268209160185
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment54.453.051.546.544.741.938.044.640.637.142.746.0
Percentage of Assets0.40.40.30.30.30.20.20.30.30.20.20.2
Percentage of Assets us-gaap:Equipment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LandImprovements


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value0.50.51.11.00.80.70.70.60.60.80.60.8
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment0.00.10.10.10.10.10.10.10.10.10.20.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:LandImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value3373062812632362222122132101809988
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment30.731.131.730.230.732.334.429.731.832.026.521.9
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.10.1
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.94.34.34.34.24.14.14.24.14.24.24.34.44.54.66.05.32.93.33.43.53.54.0
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AmortizationOfIntangibleAssets us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Amortization
Period End2021-06-302021-03-312020-06-302020-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value95949191838285837875797571677065645965605754575552525048464445444139
Percentage of AmortizationOfIntangibleAssets2459.02186.02169.02234.11978.61923.31943.21857.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0969.6683.3737.7
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherIntangibleAssets


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value3.94.34.34.34.24.14.14.24.14.24.24.34.44.54.42.32.32.42.52.02.22.12.12.12.14.64.84.85.04.95.65.25.15.25.35.25.24.66.05.32.9
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value496496514510501490483400407411428417428442464462463459466438434437446427436442444436441449458444454457469453462481494492495494504543
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.30.30.30.40.30.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.50.50.50.50.50.60.7

us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value9414997116112112115121124125130169
Percentage of PropertyPlantAndEquipmentNet18.431.022.825.024.125.326.026.526.425.325.831.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.20.2
Percentage of Assets us-gaap:Building0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Equipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value219209192185180161157167169181182173
Percentage of PropertyPlantAndEquipmentNet42.643.344.939.938.736.135.436.636.036.836.131.9
Percentage of Assets0.10.20.10.10.10.10.10.20.20.20.20.2
Percentage of Assets us-gaap:Equipment0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LandImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value141414142525252631313240
Percentage of PropertyPlantAndEquipmentNet2.72.93.33.15.55.85.85.86.66.46.57.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:LandImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LeaseholdImprovements


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value186110124126121118115110110118119117
Percentage of PropertyPlantAndEquipmentNet36.222.829.027.226.126.525.924.023.523.923.621.6
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets us-gaap:LeaseholdImprovements0.00.00.00.00.00.00.00.00.00.00.00.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value709704707698690689696687682683669672673611605526523519519524527523526529534527533538544541540537530529537538533536532534434405400401389
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.50.50.40.50.60.50.60.50.50.50.50.40.40.40.40.40.40.40.40.50.40.40.50.50.50.50.50.50.60.50.60.60.60.60.60.50.60.40.40.50.50.5

us-gaap:Goodwill us-gaap:BusinessAcquisition

ntrs:PariluxInvestmentTechnologyLLC


Goodwillus-gaap:
Period End2021-06-30
Value4.2
Percentage of Goodwill0.6
Percentage of Assets0.0
Percentage of Assets ntrs:PariluxInvestmentTechnologyLLC0.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value638632636626619625598
Percentage of Goodwill90.089.989.989.889.789.889.4
Percentage of Assets0.40.40.40.40.40.50.5
Percentage of Assets ntrs:CorporateAndInstitutionalServiceSegment0.00.00.00.00.00.00.0

ntrs:WealthManagementSegment


Goodwillus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-12-31
Value71717171717171
Percentage of Goodwill10.010.110.110.210.310.210.6
Percentage of Assets0.00.00.00.00.00.10.1
Percentage of Assets ntrs:WealthManagementSegment0.00.00.00.00.00.00.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


Finite
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value100103112112112114120121130132138144149160161373941414547454649515260657378838792971041081121201231309353
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:ComputerSoftwareIntangibleAsset


Finite
Period End2021-06-302021-03-312020-12-312019-12-31
Value1605159415921507
Percentage of FiniteLivedIntangibleAssetsNet1590.81535.91414.71249.8
Percentage of Assets0.91.00.91.1
Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset0.00.00.00.0

us-gaap:OtherIntangibleAssets


Finite
Period End2020-12-312019-12-31
Value112120
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0
Percentage of Assets0.10.1
Percentage of Assets us-gaap:OtherIntangibleAssets0.00.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value560491466436460
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets0.30.40.40.30.4

Other Assets

us-gaap:OtherAssets

us-gaap:OtherAssets


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value947988218384845883841180284017982730360895757575263215457468746154454391249534191575750644464511641015363586552893870430747644952622541253930358037503444406864554675445638883651
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.55.44.95.65.57.36.16.45.85.04.44.34.74.23.43.53.53.24.03.54.74.33.84.33.45.05.34.83.74.14.65.26.44.44.03.84.03.84.16.74.84.84.64.4

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value9001444803706
Percentage of OtherAssets10.717.213.915.1
Percentage of Assets0.51.10.60.5
Percentage of Assets srt:ParentCompany5.39.15.65.2

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-31
Value92
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-31
Value85
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0
Percentage of Assets0.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-31
Value74
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value77
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-31
Value372
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0
Percentage of Assets0.2

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value700603552492509
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.4

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-31
Value801
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0
Percentage of Assets0.5

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-31
Value100
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0
Percentage of Assets0.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value11823114571168811579113821087911091108111080510616105081036410357102261021610165100679977977095798951883287058784874986078448854280427948791278177724761275277532739072237117715270256928683067686619644763126389
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.97.06.97.67.56.78.18.78.58.77.97.87.77.97.47.78.08.27.98.07.47.57.57.37.38.07.77.77.67.77.78.17.98.27.78.07.87.97.17.47.27.58.10.00.00.07.77.8

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value11688110911050810216
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets6.98.17.97.4
Percentage of Assets srt:ParentCompany68.569.873.275.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value-324.7-347.5-355.3-389.7-407.2-415.8-422.8-389.9-394.2-398.4-410.7-378.1-385.0-392.4-342.2-314.6-318.9-323.2-325.2-309.7-313.0-317.0-321.1-322.5-328.6-340.9-260.3
Percentage of StockholdersEquity-2.7-3.0-3.0-3.4-3.6-3.8-3.8-3.6-3.6-3.8-3.9-3.6-3.7-3.8-3.3-3.1-3.2-3.2-3.3-3.2-3.5-3.6-3.7-3.7-3.8-4.0-3.3
Percentage of Assets-0.2-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-31
Value-5.4-8.4-3.21.60.33.6-3.72.14.5-0.34.0-6.0-1.81.74.56.1-3.0
Percentage of StockholdersEquity-0.0-0.1-0.00.00.00.0-0.00.00.0-0.00.0-0.1-0.00.00.00.1-0.0
Percentage of Assets-0.0-0.0-0.00.00.00.0-0.00.00.0-0.00.0-0.0-0.00.00.00.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value373272641665631313114190133-29.3-114.9-199.6-167.5-147.6-74.8-13.7-11.5-13.1-32.4637743-31.05259276.0
Percentage of StockholdersEquity3.22.45.55.75.62.91.01.81.2-0.3-1.1-1.9-1.6-1.4-0.7-0.1-0.1-0.1-0.30.70.90.5-0.40.60.70.30.1
Percentage of Assets0.20.20.40.40.40.20.10.20.1-0.0-0.1-0.2-0.1-0.1-0.1-0.0-0.0-0.0-0.00.10.10.0-0.00.00.00.00.0
Percentage of Assets us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1946542842437045-194.7-91.0-159.8-345.3-453.7-526.9-508.1-505.7-414.3-335.1-338.9-352.0-370.0-259.7-239.6-283.9-372.7-273.7-273.7-266.4-319.7-218.4-205.2-236.1-244.3-337.9-350.7-284.1-283.0-215.9-274.1-276.3-345.6-232.5-243.3-279.6-305.3-266.1-315.3-332.5-361.6-494.9-90.3
Percentage of StockholdersEquity1.60.63.73.73.30.4-1.8-0.8-1.5-3.3-4.3-5.1-4.9-4.9-4.1-3.3-3.4-3.5-3.8-2.7-2.7-3.2-4.3-3.1-3.1-3.1-3.8-2.6-2.6-3.0-3.1-4.3-4.5-3.7-3.8-2.9-3.7-3.8-4.9-3.3-3.5-4.0-4.5-3.9-4.8-5.2-5.7-7.70.0
Percentage of Assets0.10.00.30.30.20.0-0.1-0.1-0.1-0.3-0.3-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.4-0.4-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.40.00.00.0-0.4-0.60.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-31
Value151149144147145143117106968267564632-1.8-8.0-11.6-16.5-18.5-16.9-7.4-13.7-17.6-4.1-1.8-1.77.1
Percentage of StockholdersEquity1.31.31.21.31.31.31.11.00.90.80.60.50.40.3-0.0-0.1-0.1-0.2-0.2-0.2-0.1-0.2-0.2-0.0-0.0-0.00.1
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value9219149639619519381013100910131003106810551050102010471037102710101035103810401022107210581044102410501055103910221035103110149951012100499598197796294893292091190589588817869
Percentage of StockholdersEquity7.88.08.28.38.48.69.19.39.49.510.210.210.110.010.310.210.210.110.610.811.611.612.312.111.911.912.412.412.912.913.113.213.113.113.513.313.513.613.713.513.513.513.513.513.713.914.12.80.0
Percentage of Assets0.50.60.60.60.60.60.70.80.80.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.00.91.01.01.01.11.01.11.01.11.11.11.01.01.01.01.10.00.00.01.10.20.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408408379379
Percentage of StockholdersEquity3.53.63.53.53.63.83.73.83.83.83.93.93.94.04.04.04.14.14.24.34.64.64.74.74.74.74.84.85.15.15.25.25.35.45.45.45.55.75.75.75.85.96.06.06.26.36.55.90.0
Percentage of Assets0.20.20.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.00.00.00.50.50.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:PreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312013-12-312012-12-312008-12-31
Value88488488488488488412738828828828828828828828828828828828828823883883883883883880.00.01501
Percentage of StockholdersEquity7.57.77.67.67.88.111.58.28.28.38.48.58.58.68.68.78.88.89.09.24.34.44.54.44.44.60.00.023.5
Percentage of Assets0.50.50.50.60.60.50.90.70.70.70.70.70.70.70.60.70.70.70.70.70.30.30.30.30.30.40.00.01.8
Percentage of Assets us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value12630124151220712118119881182811656114411122510972107761049610262997396859431924790748908873685668394824280937949777176257469734472417134704069096793670266076502632363026240613860545972588357965665557650914556
Percentage of StockholdersEquity106.8108.4104.4104.7105.3108.7105.1105.8103.9103.4102.6101.399.197.594.892.891.990.991.291.295.795.094.792.190.990.390.387.491.391.190.290.189.489.389.087.788.087.588.587.287.487.487.486.987.687.988.379.70.0
Percentage of Assets7.37.67.28.07.97.38.59.28.99.08.27.97.67.77.07.27.47.57.27.37.07.17.16.76.67.36.96.76.97.06.97.37.17.36.97.16.96.96.36.56.36.57.10.00.00.06.86.20.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-3217.2-3231.2-3204.5-3219.0-3221.6-3225.2-3066.1-2839.2-2564.6-2305.3-2173.9-1950.8-1737.6-1553.1-1392.4-1259.0-1158.3-1045.5-1094.4-1225.8-1212.5-1097.3-1033.6-891.3-768.5-719.7-704.8-561.0-544.2-488.5-422.8-325.5-256.8-301.4-314.0-273.2-241.7-214.5-225.5-226.5-227.1-188.2-165.1-169.3-175.5-189.2-199.2-266.5-405.7
Percentage of StockholdersEquity-27.2-28.2-27.4-27.8-28.3-29.6-27.6-26.3-23.7-21.7-20.7-18.8-16.8-15.2-13.6-12.4-11.5-10.5-11.2-12.8-13.5-12.4-11.9-10.1-8.8-8.4-8.3-6.6-6.8-6.1-5.3-4.2-3.3-4.0-4.2-3.6-3.3-3.0-3.2-3.2-3.2-2.7-2.4-2.5-2.7-2.9-3.2-4.20.0
Percentage of Assets-1.9-2.0-1.9-2.1-2.1-2.0-2.2-2.3-2.0-1.9-1.6-1.5-1.3-1.2-1.0-1.0-0.9-0.9-0.9-1.0-1.0-0.9-0.9-0.7-0.6-0.7-0.6-0.5-0.5-0.5-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.20.00.00.0-0.2-0.30.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312011-03-312010-12-312009-12-31
Value92191496396195193810131009101310031068105510501020104710371027101010351038104010221072105810441024105010551035932920888
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.60.60.60.60.70.80.80.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.00.91.01.01.11.1

us-gaap:AdditionalPaidInCapital us-gaap:ConsolidatedEntities

srt:ParentCompany


Additional
Period End2020-12-312019-12-312018-12-312017-12-31
Value963101310681047
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0
Percentage of Assets0.60.70.80.8
Percentage of Assets srt:ParentCompany5.66.47.47.7

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value126301241512207121181198811828116561144111225109721077610496102629973968594319247907489088736856683948242809379497771762574697344724171347040690967936702660765026323630262406138605459725576
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.37.67.28.07.97.38.59.28.99.08.27.97.67.77.07.27.47.57.27.37.07.17.16.76.67.36.96.76.97.06.97.37.17.36.97.16.96.96.36.56.36.57.16.8

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

srt:ParentCompany


Retained
Period End2020-12-312019-12-312018-12-312017-12-31
Value1220711656107769685
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0
Percentage of Assets7.28.58.27.0
Percentage of Assets srt:ParentCompany71.673.475.171.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value1946542842437045-194.7-91.0-159.8-345.3-453.7-526.9-508.1-505.7-414.3-335.1-338.9-352.0-370.0-259.7-239.6-283.9-372.7-273.7-273.7-266.4-319.7-218.4-205.2-236.1-244.3-337.9-350.7-284.1-283.0-215.9-274.1-276.3-345.6-232.5-243.3-279.6-305.3-266.1-315.3-332.5-361.6-494.9-90.3
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.00.30.30.20.0-0.1-0.1-0.1-0.3-0.3-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.4-0.4-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.40.00.00.0-0.4-0.60.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

srt:ParentCompany


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-31
Value428-194.7-453.7-414.3
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0
Percentage of Assets0.3-0.1-0.3-0.3
Percentage of Assets srt:ParentCompany2.5-1.2-3.2-3.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value32173231320432193221322530662839256423052173195017371553139212591158104510941225121210971033891768719704561544488422325256301314273241214225226227188165199
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.92.01.92.12.12.02.22.32.01.91.61.51.31.21.01.00.90.90.91.01.00.90.90.70.60.70.60.50.50.50.40.30.30.30.30.30.30.20.20.20.20.20.20.2

us-gaap:TreasuryStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Treasury
Period End2020-12-312019-12-312018-12-312017-12-31
Value3204306621731392
Percentage of TreasuryStockValue100.0100.0100.0100.0
Percentage of Assets1.92.21.61.0
Percentage of Assets srt:ParentCompany18.819.315.210.2

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1236.0681476-77.93183-2685.31636577842934591453332-477.8850557-472.17848381184-214.0-299.11350-1043.41036490-337.5-266.51001538-121.62242-1594.231223251-218.37571391-700.249072-129.215273234
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-360.219.5418.7-21.9783.6-507.4284.093.013.244.370.8242.658.5-94.4174.3122.8-113.2191.3226.0339.2-62.1-85.0408.4-341.3358.9164.3-111.1-90.7340.9182.3-40.2770.4-579.1109.07.778.0-67.9222.2392.1-201.7136.321.0-38.646.0230.411.1

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-7365.35133-16808.511767209-21500.3-12403.41667-4276.311607-1021.11730-7538.711156-8055.9-5667.7-1324.51026-4939.4-322.3-5583.66533609-2849.9-10466.62805853-5981.3-2262.5-822.1-6193.3-2201.1-1727.84438-3705.3724-3294.27903-6472.12215-3126.5-8005.7-4072.4-477.1-2724.55506
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-2146.71467.2-4767.0331.11774.3-4062.8-2153.0268.5-668.01751.3-157.4288.8-1327.92205.2-1650.5-1248.9-317.5250.2-1331.4-92.3-1619.8185.61091.6-932.3-3624.2939.1280.8-2035.8-770.1-278.3-2048.0-756.1-627.61548.3-1226.5224.1-1024.62317.6-1824.2638.4-869.2-2306.5-1218.2-144.5-857.01751.8

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8800-4905.614839-838.3-11837.42570810114-2483.54431-11446.477-2939.66210-9167.2643646322891-2707.64715-1307.341253.4-3035.3133912421-2191.3-417.4527614267886814-1989.3-5104.146673978-1173.52909-8787.35155-2061.64025868434611522896-5365.9
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2565.1-1402.04208.6-235.9-2913.54857.91755.7-400.0692.1-1727.012.0-490.61094.0-1812.11318.61020.8693.1-659.91271.0-374.41196.81.0-917.8438.24301.0-733.4-137.31795.8485.7266.82253.3-683.4-1854.01628.01317.0-363.2904.9-2576.91453.0-593.91119.02502.01035.446.3911.2-1707.3

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value214194-348.0275-1371.01374-578.4-310.7274492-491.8
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating62.655.7-98.777.5-337.4259.6-100.4-50.042.874.3-75.8

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value626-462.0-189.5548113-456.1203-249.4126368-435.7-294.3-242.3242-461.2-122.6713172-669.1-104.7-222.7343-12.164113151134108-302.9-26.8-109.8-85.1173-188.420011686-407.3-220.5-315.11832-184.617969-206.5
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1236.0681476-77.93183-2685.31636577842934591453332-477.8850557-472.17848381184-214.0-299.11350-1043.41036490-337.5-266.51001538-121.62242-1594.231223251-218.37571391-700.249072-129.215273234
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-360.219.5418.7-21.9783.6-507.4284.093.013.244.370.8242.658.5-94.4174.3122.8-113.2191.3226.0339.2-62.1-85.0408.4-341.3358.9164.3-111.1-90.7340.9182.3-40.2770.4-579.1109.07.778.0-67.9222.2392.1-201.7136.321.0-38.646.0230.411.1

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value368375240294313360371384389347409374390381356298267276266257260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating107.3107.268.382.977.168.164.462.060.852.463.262.568.875.473.165.864.267.371.873.875.668.772.476.793.277.280.369.661.961.456.170.969.457.255.555.355.947.336.749.142.343.547.047.162.850.0

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value16115886113143177164185191
Percentage of NetIncomeLoss43.942.236.038.445.749.344.348.149.3
Percentage of InterestAndDividendIncomeOperating47.145.224.631.835.233.628.529.830.0
Percentage of InterestAndDividendIncomeOperating ntrs:CorporateAndInstitutionalServiceSegment0.00.00.00.00.00.00.00.00.0

ntrs:TreasuryAndOtherSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-20.4-3.7-15.6-4.8-13.4-6.8-4.4-6.0-2.9
Percentage of NetIncomeLoss-5.5-1.0-6.5-1.6-4.3-1.9-1.2-1.6-0.7
Percentage of InterestAndDividendIncomeOperating-5.9-1.1-4.4-1.4-3.3-1.3-0.8-1.0-0.5
Percentage of InterestAndDividendIncomeOperating ntrs:TreasuryAndOtherSegment0.00.00.00.00.00.00.00.00.0

ntrs:WealthManagementSegment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value226220169186183189211205200
Percentage of NetIncomeLoss61.658.870.563.258.652.656.953.551.5
Percentage of InterestAndDividendIncomeOperating66.163.048.252.445.235.836.733.131.3
Percentage of InterestAndDividendIncomeOperating ntrs:WealthManagementSegment0.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value368375294313360384389347409374390381356298267276266263260241239234269230244204181181169206191164167178179161130170152151157155199157
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating107.3107.282.977.168.162.060.852.463.262.568.875.473.165.864.267.371.875.575.668.772.476.793.277.280.369.661.961.456.170.969.457.255.555.355.947.336.749.142.343.547.047.162.850.0
Percentage of InterestAndDividendIncomeOperating us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-7365.35133-16808.511767209-21500.3-12403.41667-4276.311607-1021.11730-7538.711156-8055.9-5667.7-1324.51026-4939.4-322.3-5583.66533609-2849.9-10466.62805853-5981.3-2262.5-822.1-6193.3-2201.1-1727.84438-3705.3724-3294.27903-6472.12215-3126.5-8005.7-4072.4-477.1-2724.55506
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating-2146.71467.2-4767.0331.11774.3-4062.8-2153.0268.5-668.01751.3-157.4288.8-1327.92205.2-1650.5-1248.9-317.5250.2-1331.4-92.3-1619.8185.61091.6-932.3-3624.2939.1280.8-2035.8-770.1-278.3-2048.0-756.1-627.61548.3-1226.5224.1-1024.62317.6-1824.2638.4-869.2-2306.5-1218.2-144.5-857.01751.8

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value28103326393710822189.15815176.0272325145326201243121725301818134812191145117.09.94130168.931281019
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8800-4905.614839-838.3-11837.42570810114-2483.54431-11446.477-2939.66210-9167.2643646322891-2707.64715-1307.341253.4-3035.3133912421-2191.3-417.4527614267886814-1989.3-5104.146673978-1173.52909-8787.35155-2061.64025868434611522896-5365.9
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of InterestAndDividendIncomeOperating2565.1-1402.04208.6-235.9-2913.54857.91755.7-400.0692.1-1727.012.0-490.61094.0-1812.11318.61020.8693.1-659.91271.0-374.41196.81.0-917.8438.24301.0-733.4-137.31795.8485.7266.82253.3-683.4-1854.01628.01317.0-363.2904.9-2576.91453.0-593.91119.02502.01035.446.3911.2-1707.3

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value145145145145145147148129131120121949495958787868681828283837777777574757474701.11447368676868686868696767
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:PaymentsForRepurchaseOfCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value301351.31.50.2296264307271257234235190263170124157706565140140152140961071657774163122971574624935141.31.34036-0.12.10.13.8
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

ntrs:StockOptionPlans


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value66.8764.7761.960.9955.255.5154.753.6452.5352.39
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value708524401364553656785803
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value139143149155300265226188229264184212446
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value222521271712111519178988334
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value55290.31.10.91.63.90.00.00.0
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:DeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority

us-gaap:ForeignCountry


Deferred
Period End2020-12-312019-12-31
Value2529
Percentage of DeferredTaxAssetsValuationAllowance45.899.0

ntrs:AllowanceForCreditLossRecovery

ntrs:AllowanceForCreditLossRecovery


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3200000.01300000.01200000.01200000.03000000.01100000.01500000.01700000.01800000.02200000.0
Percentage of AllowanceForCreditLossRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:AllowanceForCreditLossWriteoff

ntrs:AllowanceForCreditLossWriteoff


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.46.70.80.41.83.81.10.61.0
Percentage of AllowanceForCreditLossWriteoff0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:AverageInterestBearingDepositsInFederalReserveBankForReserveRequirements

ntrs:AverageInterestBearingDepositsInFederalReserveBankForReserveRequirements


Average
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value-100.0-300.0-900.017000.01600150015000.01700170018004004000180020002200230018001800170017001500130013001200900900900110010001100467238331186268
Percentage of AverageInterestBearingDepositsInFederalReserveBankForReserveRequirements100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:ChangeInFederalFundsPurchased

ntrs:ChangeInFederalFundsPurchased


Change
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.02601943-1489.03655-3817.7-352.41672831942
Percentage of ChangeInFederalFundsPurchased0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:ChangeInPresentExpenseReversalAndWriteoffAfterRecovery

ntrs:ChangeInPresentExpenseReversalAndWriteoffAfterRecovery


Change
Period End2020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value5500000.0-400000.0-2600000.0700000.0-600000.0-1200000.0-1200000.0
Percentage of ChangeInPresentExpenseReversalAndWriteoffAfterRecovery100.0100.0100.0100.0100.0100.0100.0

ntrs:ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

ntrs:ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement

us-gaap:InterestRateContract, us-gaap:InterestExpense


Changein
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value247.023-2.511-2.99.1-6.03.7-1.64.6-6.48.31.59.41.115
Percentage of ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:InterestIncome


Changein
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-2.0-1.6-1.6-14.23.1-0.57.92.85.05.5113.56.6-3.71.9-6.71.5
Percentage of ChangeinUnrealizedGainLossonAmountsRelatedtoSettlement-8.2-22.9-6.7568.027.017.286.8-46.7135.1-343.8247.8-54.779.5-246.720.2-609.19.9

ntrs:CreditLossExpenseReversal

ntrs:CreditLossExpenseReversal


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-27.0-30.0-2.50.56660-1.0-7.0-6.50.0
Percentage of CreditLossExpenseReversal100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

ntrs:CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss

ntrs:CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss


Credit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-27.0-30.0-2.50.56661-1.0-7.0-6.50.0
Percentage of CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

ntrs:CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Credit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-16.8-5.4-19.228254.8-2.4
Percentage of CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss62.218.0-3840.043.642.1-68.636.9

ntrs:WealthManagementSegment


Credit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-10.2-24.6193735-11.8-4.1
Percentage of CreditLossExpenseReversalAndAvailableForSaleAllowanceForCreditLoss37.882.03940.056.457.9168.663.1

ntrs:DebtSecuritiesHeldToMaturityUnrealizedGainLossTransferFromAvailableForSale

ntrs:DebtSecuritiesHeldToMaturityUnrealizedGainLossTransferFromAvailableForSale


Debt
Period End2021-06-30
Value120
Percentage of DebtSecuritiesHeldToMaturityUnrealizedGainLossTransferFromAvailableForSale100.0

ntrs:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForAmortizationPeriodAdjustment

ntrs:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForAmortizationPeriodAdjustment


Defined
Period End2021-06-302021-03-312020-08-312020-09-302020-06-302020-03-312019-09-30
Value118103-0.397909787
Percentage of DefinedBenefitPlanBenefitObligationIncreaseDecreaseForAmortizationPeriodAdjustment100.0100.0100.0100.0100.0100.0100.0

ntrs:EquipmentAndSoftwareExpense

ntrs:EquipmentAndSoftwareExpense


Equipment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17817617617016416216415114714815214514414013213013312712011411811411611311411010310011610198959291908699909576837378726966
Percentage of EquipmentAndSoftwareExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:FinancingReceivableNonTDRModificationsDeferredInterest ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanRestructuringModificationName

ntrs:FinancingReceivableNonTDRModificationsDeferredInterest

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient, ntrs:CARESAct


Financing
Period End2020-12-31
Value0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.0

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-100000.0200000.0-200000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-200000.02000000.0700000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-600000.03200000.0-100000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-200000.01200000.00
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-200000.02000000.0200000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:FinancingReceivableNonTDRModificationsDeferredInterest ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-100000.0200000.0-200000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-800000.05200000.0600000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-400000.03200000.0200000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:FinancingReceivableNonTDRModificationsDeferredInterest ntrs:DeferralStatus, us-gaap:LoanRestructuringModificationName

ntrs:ActiveDeferral, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-100000.0200000.0-700000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:CompletedDeferral, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-1200000.08400000.0800000.0
Percentage of FinancingReceivableNonTDRModificationsDeferredInterest0.00.00.0

ntrs:FinancingReceivableNonTDRModificationsDeferredPrincipal ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanRestructuringModificationName

ntrs:FinancingReceivableNonTDRModificationsDeferredPrincipal

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value0.00.2-0.2
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal0.0100.0100.0

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans, ntrs:CARESAct


Financing
Period End2020-12-31
Value-4.9
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal2450.0

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value0.11.41.1
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal0.0700.0-550.0

ntrs:FinancingReceivableNonTDRModificationsDeferredPrincipal ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value0.00.2-0.1
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal0.0100.050.0

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CARESAct


Financing
Period End2020-12-31
Value-7.8
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal3900.0

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value0.11.4-1.2
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal0.0700.0600.0

ntrs:FinancingReceivableNonTDRModificationsDeferredPrincipal ntrs:DeferralStatus, us-gaap:LoanRestructuringModificationName

ntrs:ActiveDeferral, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value0.00.2-0.4
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal0.0100.0200.0

ntrs:CompletedDeferral, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value0.11.4-9.0
Percentage of FinancingReceivableNonTDRModificationsDeferredPrincipal0.0700.04500.0

ntrs:FinancingReceivableNonTDRModificationsRecordedInvestment ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:LoanRestructuringModificationName

ntrs:FinancingReceivableNonTDRModificationsRecordedInvestment

ntrs:ActiveDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans, ntrs:CARESAct


Financing
Period End2020-12-31
Value-67.2
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment100.0

ntrs:ActiveDeferral, us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate, ntrs:CARESAct


Financing
Period End2020-12-31
Value-6.6
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment9.8

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient, ntrs:CARESAct


Financing
Period End2020-12-31
Value3.7
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment-5.5

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-4.89.5-14.2
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.021.1

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-11.723849
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.0-73.8

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-13.5457-4.4
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.06.5

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:PrivateClient, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-16.8169-5.7
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.08.5

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-18.6164-2.1
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.03.1

ntrs:FinancingReceivableNonTDRModificationsRecordedInvestment ntrs:DeferralStatus, us-gaap:FinancingReceivablePortfolioSegment, us-gaap:LoanRestructuringModificationName

ntrs:ActiveDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CARESAct


Financing
Period End2020-12-31
Value-73.8
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment109.8

ntrs:ActiveDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-4.89.5-10.5
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.015.6

ntrs:CompletedDeferral, us-gaap:CommercialPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-25.269545
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.0-67.3

ntrs:CompletedDeferral, us-gaap:ConsumerPortfolioSegment, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-35.4334-7.8
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.011.6

ntrs:FinancingReceivableNonTDRModificationsRecordedInvestment ntrs:DeferralStatus, us-gaap:LoanRestructuringModificationName

ntrs:ActiveDeferral, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-4.89.5-84.3
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.0125.4

ntrs:CompletedDeferral, ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-12-31
Value-60.6103037
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestment0.00.0-55.7

ntrs:FinancingReceivableNonTDRModificationsRecordedInvestmentPaidOff us-gaap:LoanRestructuringModificationName

ntrs:FinancingReceivableNonTDRModificationsRecordedInvestmentPaidOff

ntrs:CARESAct


Financing
Period End2021-06-302021-03-312020-09-30
Value5742-28.7
Percentage of FinancingReceivableNonTDRModificationsRecordedInvestmentPaidOff100.0100.0100.0

ntrs:FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance

ntrs:FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value1143-3.0180.025183.17.8
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance100.0100.0100.0100.00.0100.0100.0100.0100.0

ntrs:FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1142-1.01.00.0240.00.00.08.8
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance94.199.333.35.40.095.30.00.00.00.0

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.70.3-2.0170.01.2183.17.89.9
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance5.90.766.794.60.04.7100.0100.0100.00.0

ntrs:FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.019-1.01.00.0240.00.00.08.8
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance0.045.433.35.40.095.30.00.00.00.0

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2021-06-302021-03-312019-06-30
Value11230.0
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance94.153.90.0

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.70.3-2.0170.01.2183.17.89.9
Percentage of FinancingReceivableTroubledDebtRestructuringPostmodificationUnpaidPrincipalBalance5.90.766.794.60.04.7100.0100.0100.00.0

ntrs:HeldToMaturitySecuritiesTransferredFromAvailableForSale

ntrs:HeldToMaturitySecuritiesTransferredFromAvailableForSale


Held
Period End2021-06-302020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-09-30
Value68600.03010.01601603010.02872871000
Percentage of HeldToMaturitySecuritiesTransferredFromAvailableForSale100.00.0100.00.0100.0100.0100.00.0100.0100.0100.0

ntrs:IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment

ntrs:IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value494502384397410469486516514460498491516492451428399399394380401365357359417356352311277278254309293250232277276246180262240240224246309
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value214208131151184227211244250
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment43.441.534.238.244.948.543.647.448.6

ntrs:TreasuryAndOtherSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-27.2-4.9-20.800000000000004-6.4-17.9-9.0-5.8-7.9-3.9
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment-5.5-1.0-5.4-1.6-4.4-1.9-1.2-1.5-0.8

ntrs:WealthManagementSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value307299273252244250280279268
Percentage of IncomeLossBeforeIncomeTaxesIncludingFullyTaxableEquivalentAdjustment62.159.571.363.459.553.457.654.152.1

ntrs:IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment

ntrs:IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1261271431039710811513112511288116126110951301311231281231401231171241481251081069596851021028664989685509288896791109
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value535044384149475958
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment41.839.331.137.542.345.941.445.546.6

ntrs:TreasuryAndOtherSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-6.8-1.2-5.199999999999999-1.6-4.5-2.2-1.4-1.9-1.0
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment-5.4-0.9-3.6-1.5-4.6-2.0-1.2-1.4-0.8

ntrs:WealthManagementSegment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value8078103666060687367
Percentage of IncomeTaxExpenseBenefitIncludingFullyTaxableEquivalentAdjustment63.561.672.664.162.356.159.855.954.2

ntrs:InterestExpenseSeniorNotes

ntrs:InterestExpenseSeniorNotes


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value131315192017181918151514111111111111111111111111111111111317171819191918161616161515141111
Percentage of InterestExpenseSeniorNotes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:InterestIncomeFederalReserveDepositsAndOther

ntrs:InterestIncomeFederalReserveDepositsAndOther


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.11.21.40000000000000372.74.024364450686960575452524136262823169.4101012119.18.79.35.83.82.62.94.12.35.25.37.29.66.54.03.12.74.3
Percentage of InterestIncomeFederalReserveDepositsAndOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment

ntrs:InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value343346345336379416430425425429430418422392396366350362329310306314296275257266270256253254259244228233
Percentage of InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value153160148139165211224229229
Percentage of InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment44.546.443.141.643.550.852.154.154.0

ntrs:WealthManagementSegment


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value190186196196214204206195195
Percentage of InterestRevenueExpenseNetIncludingFullyTaxableEquivalentAdjustment55.553.656.958.456.549.247.945.946.0

ntrs:InvestmentSecurityGainsLossesNet

ntrs:InvestmentSecurityGainsLossesNet


Investment
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-500000.00100000.00-500000.0-300000.0-100000.0-200000.0-500000.0000-400000.0-400000.0-400000.0-200000.00200000.00300000.00-400000.0100000.0-700000.0300000.0400000.0-100000.0400000.0-2200000.0100000.0200000.00400000.0500000.0700000.0200000.0-700000.0300000.0-400000.00500000.00300000.0
Percentage of InvestmentSecurityGainsLossesNet100.00.0100.00.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0

ntrs:NetChangeInClientSecuritySettlementReceivables

ntrs:NetChangeInClientSecuritySettlementReceivables


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value47810-1150.5218-82.71241-1286.1796-750.9419106-483.01484-1058.2372-442.3142519-931.2-229.8317-261.0240-108.6-187.966042-52.2-251.6485-273.9144671-1232.6970353-260.5207-169.9-629.8273602-3.0-157.5-108.8175
Percentage of NetChangeInClientSecuritySettlementReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:NetIncomeLossAllocatedToCommonStockholdersBasic

ntrs:NetIncomeLossAllocatedToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value360355234275305326361362379325398353379359345276257250255246250231229225259221230201178178166203187161165176176159128168150149155154198
Percentage of NetIncomeLossAllocatedToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:NoninterestExpenseOther

ntrs:NoninterestExpenseOther


Noninterest
Period End2021-06-302021-03-312020-06-302020-03-31
Value40495839
Percentage of NoninterestExpenseOther100.0100.0100.0100.0

ntrs:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTa

ntrs:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTa


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-12.182-117.4-55.01421077.92837157-74.3-62.3-102.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTa100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:OtherFinancialAssetsCreditLossExpenseReversal

ntrs:OtherFinancialAssetsCreditLossExpenseReversal


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-03-31
Value-500000.0900000.0100000.0-600000.0200000.0700000.00
Percentage of OtherFinancialAssetsCreditLossExpenseReversal100.0100.0100.0100.0100.0100.00.0

ntrs:OtherNoninterestIncome

ntrs:OtherNoninterestIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value169179161152172176134144133130152126149154
Percentage of OtherNoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:PaymentsForProceedsFromFederalReserveAndForeignCentralBankDeposits

ntrs:PaymentsForProceedsFromFederalReserveAndForeignCentralBankDeposits


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value7368-8369.315252-3852.0-2760.41120410715-4539.44246-6738.8-2445.5-439.24738-11533.0627646672572-767.14913-688.31885-1987.3-3798.45094
Percentage of PaymentsForProceedsFromFederalReserveAndForeignCentralBankDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:PercentageOfConsolidatedNetIncome

ntrs:PercentageOfConsolidatedNetIncome


Percentage
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value100.0100.0100.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.0
Percentage of PercentageOfConsolidatedNetIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:PercentageOfConsolidatedNetIncome us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Percentage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value44.042.0-2.039.00.4549.0-1.048.00.49
Percentage of PercentageOfConsolidatedNetIncome44.042.00.039.045.04900.00.04800.049.0

ntrs:TreasuryAndOtherSegment


Percentage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-6.0-1.00-2.0-0.04-2.00-2.0-0.01
Percentage of PercentageOfConsolidatedNetIncome-6.0-1.00.0-2.0-4.0-200.00.0-200.0-1.0

ntrs:WealthManagementSegment


Percentage
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value62.059.02.063.00.5953.01.054.00.52
Percentage of PercentageOfConsolidatedNetIncome62.059.00.063.059.05300.00.05400.052.0

ntrs:ProceedsfromSaleofInvestmentSecurities

ntrs:ProceedsfromSaleofInvestmentSecurities


Proceedsfrom
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-30
Value0.04092801771011270.01762.039897854121710.05133.8
Percentage of ProceedsfromSaleofInvestmentSecurities0.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:RevenueIncludingFullyTaxableEquivalentAdjustment

ntrs:RevenueIncludingFullyTaxableEquivalentAdjustment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value158815901532149315131595155715451514148815161484151514841440135713301293124612201323119611631161126211401137108510881049105410551028984979983998975965981955908
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:RevenueIncludingFullyTaxableEquivalentAdjustment us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value901916864839868912887898881
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment56.757.656.456.357.457.257.058.258.2

ntrs:TreasuryAndOtherSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-8.5-3.6-7.3-5.3-8.62.9-2.2-6.7-3.1
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment-0.5-0.2-0.5-0.4-0.60.2-0.1-0.4-0.2

ntrs:WealthManagementSegment


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value695677675658653680672653636
Percentage of RevenueIncludingFullyTaxableEquivalentAdjustment43.842.644.144.143.242.643.242.342.0

ntrs:SalariesWagesAndIncentives

ntrs:SalariesWagesAndIncentives


Salaries
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value486518525461460499463458455482444436454471457418432425390382389378365361361354355348372341334324326320316315313321341311320294281273278274
Percentage of SalariesWagesAndIncentives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:SecurityCommissionsandTradingIncome

ntrs:SecurityCommissionsandTradingIncome


Security
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value33343226334127292323232126272321242021202018182020192014171414161818201717181513151517141513
Percentage of SecurityCommissionsandTradingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:SegmentReportingInformationConsolidatedAverageAssets

ntrs:SegmentReportingInformationConsolidatedAverageAssets


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1543001532552165140925138770124170186116352116358119416-550.112215512386612449391112115911840011647666011638211491311341799610992411169110751311271052441033241002431634952129284991569-438.192709924109512820239402992359832651382747067428574969
Percentage of SegmentReportingInformationConsolidatedAverageAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:SegmentReportingInformationConsolidatedAverageAssets us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value119502120157188810882310705192715-107.08598286696
Percentage of SegmentReportingInformationConsolidatedAverageAssets77.478.487.277.277.174.7-57.373.974.5

ntrs:WealthManagementSegment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value34797330982773210231719314552933036929662
Percentage of SegmentReportingInformationConsolidatedAverageAssets22.621.612.822.822.925.3157.326.125.5

ntrs:SegmentReportingInformationFullyTaxableEquivalentAdjustment

ntrs:SegmentReportingInformationFullyTaxableEquivalentAdjustment


Segment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.36.6107.97.78.19.77.67.77.812109.38.716128.98.95.07.06.96.26.66.16.46.27.06.96.88.79.27.87.97.69.411109.99.49.81010109.59.69.7
Percentage of SegmentReportingInformationFullyTaxableEquivalentAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue us-gaap:AwardType

ntrs:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue

us-gaap:PerformanceShares


Share
Period End2021-03-312020-03-31
Value1920
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2021-03-312020-03-31
Value7076
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue361.0366.3

ntrs:TreasuryManagementFees

ntrs:TreasuryManagementFees


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value11111111111110111111111213141313141415151616161616161616161617171716161617171717181818191920
Percentage of TreasuryManagementFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments

us-gaap:AccretionAmortizationOfDiscountsAndPremiumsInvestments


Accretion
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-24.0-26.1-25.6-23.5-17.4-22.4-12.9-14.1-17.6-20.0-16.1-21.0-23.2-35.6-16.4-35.6-34.1-18.9-35.3-28.4-24.7-12.5-10.3-15.5-16.8-10.7-4.7-12.9-14.2-3.0-18.9-6.3-18.0-1.5-26.02.5151915-0.5109.014131313
Percentage of AccretionAmortizationOfDiscountsAndPremiumsInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount

us-gaap:AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount


Affordable
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value232320221616161615141412111212
Percentage of AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationConsiderationTransferred1

ntrs:PariluxInvestmentTechnologyLLC


Business
Period End2021-06-30
Value17
Percentage of BusinessCombinationConsiderationTransferred1100.0

us-gaap:CapitalizedComputerSoftwareAmortization1

us-gaap:CapitalizedComputerSoftwareAmortization1


Capitalized
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9191918684838483828583
Percentage of CapitalizedComputerSoftwareAmortization1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths us-gaap:InformationByCategoryOfDebtSecurity

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

ntrs:ForeignCurrencyDenominate


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2.0-8.0-4.11.52.0-2.6-5.06.2-3.9-0.2-0.2
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

ntrs:ForeignCurrencyDenominatedInvestmentSecurities


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-215.9287-66.8-35.82.616-13.416-0.20.31.1
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths-10795.0-3598.81629.3-2386.7130.0-650.0268.0258.15.1-150.0-550.0

us-gaap:AvailableforsaleSecurities


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.20.10.0-0.40.10.10.5-0.8-0.1
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths-4.96.70.015.4-2.01.6-12.8400.050.0

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1

us-gaap:InterestRateContract, us-gaap:InterestExpense


Change
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value31-142.9-51.9-2.94.6150-42.251612836-8.9-15.2-21.9-20.30.1-5.3
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:InterestIncome


Change
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-0.5189.315-14.7-76.03.1-14.9-48.7-35.4-63.8131054217.8-24.6
Percentage of ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1-1.6-12.9-17.9-520.7-319.6-50.5-7.3-29.0-78.9-124.2-174.8-146.1-68.4-247.9-107.47800.0464.2

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1

us-gaap:InterestRateContract, us-gaap:InterestExpense


Change
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-31.9142512.9-4.6-150.442-51.4-61.7-28.5-36.58.9152120-0.15.3
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:InterestIncome


Change
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value0.5-18.4-9.3-15.11476-3.114483563-13.0-10.4-54.3-21.8-7.824
Percentage of ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1-1.6-12.9-17.9-520.7-319.6-50.5-7.3-29.0-78.9-124.2-174.8-146.1-68.4-247.9-107.47800.0464.2

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain

us-gaap:DebtSecuritiesAvailableForSaleRealizedGain


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value002700000.0700000.0800000.0100000.0100000.01300000.0
Percentage of DebtSecuritiesAvailableForSaleRealizedGain0.00.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss

us-gaap:DebtSecuritiesAvailableForSaleRealizedLoss


Debt
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value500000.002600000.0700000.01300000.0400000.0200000.01500000.0
Percentage of DebtSecuritiesAvailableForSaleRealizedLoss100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-03-31
Value1900000.01300000.0400000.0400000.0-3000000.02900000.00
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal100.0100.0100.0100.0100.0100.00.0

us-gaap:DebtSecuritiesHeldToMaturityCreditLossExpenseReversal us-gaap:FinancialInstrument

ntrs:CoveredBonds


Debt
Period End2020-12-312020-09-302020-06-302020-03-31
Value0100000.0-100000.0100000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal0.025.03.33.4

ntrs:SubSovereignSupranationalAndNonUsAgencyBonds


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value800000.0600000.0600000.0-100000.0-600000.0400000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal42.146.2150.0-25.020.013.8

us-gaap:CertificatesOfDeposit


Debt
Period End2020-09-302020-06-302020-03-31
Value200000.0-200000.0200000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal50.06.76.9

us-gaap:CorporateDebtSecurities


Debt
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value500000.0300000.0200000.0-2200000.01900000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal26.323.150.073.365.5

us-gaap:ForeignGovernmentDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value600000.0700000.0-200000.000100000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal31.653.8-50.00.0-0.03.4

us-gaap:OtherDebtSecurities


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value0-300000.0100000.00100000.0200000.0
Percentage of DebtSecuritiesHeldToMaturityCreditLossExpenseReversal0.0-23.125.00.0-3.36.9

us-gaap:DefinedBenefitPlanActuarialGainLoss us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanActuarialGainLoss

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-9.4-9.4-110.1-8.8-8.8-8.8-200.4-4.3-4.3-4.3133-7.0-7.0-7.1-128.3-4.7
Percentage of DefinedBenefitPlanActuarialGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-0.2-0.3-18.3-0.2-0.3-0.3-20.4-0.2-0.2-0.110-0.3-0.3-0.30.6-0.4-0.3-0.3-25.2-0.3-0.3
Percentage of DefinedBenefitPlanActuarialGainLoss2.13.216.62.33.43.410.24.74.72.37.64.34.34.2-0.58.50.00.00.00.00.0

us-gaap:DefinedBenefitPlanActuarialGainLoss us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value0.00.1-0.40.10.20.2-1.00.20.30.36.70.00.00.00.20.00.0-2.70.00.0
Percentage of DefinedBenefitPlanActuarialGainLoss-0.0-1.10.4-1.1-2.3-2.30.5-4.7-7.0-7.05.0-0.0-0.0-0.0-0.2-0.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-2.0-2.1-15.1-1.7-1.8-1.8-17.8-1.4-1.4-1.415-1.9-1.8-1.8-17.2-1.5-1.4-1.4-3.0-1.5-1.4
Percentage of DefinedBenefitPlanActuarialGainLoss21.322.313.719.320.520.58.932.632.632.611.427.125.725.413.431.90.00.00.00.00.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-30
Value0.10.30.1
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-08-312020-09-302019-06-302019-03-312018-06-302018-03-31
Value-0.3-0.2-0.2-12.7-0.10.00.00.00.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-300.00.0-66.7-100.00.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value0.10.00.10.00.10.00.10.00.00.10.10.00.10.10.00.10.00.1
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit33.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-30
Value74
Percentage of DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-03-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.20.10.00.20.00.0
Percentage of DefinedBenefitPlanBenefitObligationIncreaseDecreaseForRemeasurementDueToSettlement0.00.00.00.00.00.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value20201919191921212121222222222323
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.70.60.80.80.80.71.51.00.91.01.11.11.11.11.21.11.11.10.91.21.2
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets3.53.04.24.24.23.66.94.64.14.65.05.05.05.05.14.70.00.00.00.00.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value9.89.81010101011111111111111111111
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.50.60.80.70.70.71.00.91.01.01.01.01.01.01.11.01.00.91.01.21.2
Percentage of DefinedBenefitPlanInterestCost5.16.17.36.56.56.58.57.68.58.59.19.09.09.09.68.80.00.00.00.00.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.10.10.10.20.20.20.30.30.30.30.30.30.40.30.30.30.40.40.40.40.3
Percentage of DefinedBenefitPlanInterestCost1.01.00.91.91.91.92.52.52.52.52.72.73.62.72.62.60.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1.00.91.21.21.21.21.41.51.41.51.31.31.41.31.31.31.31.31.21.31.3
Percentage of DefinedBenefitPlanInterestCost10.29.211.011.111.111.111.912.711.912.711.811.712.611.711.311.40.00.00.00.00.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2912121212124.64.74.74.76.36.36.26.52.22.2
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1.41.01.10.90.71.00.40.60.80.60.70.61.00.60.91.00.40.14.00.30.3
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost4.78.29.17.45.88.38.712.817.012.811.19.516.19.240.945.50.00.00.00.00.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-0.2-0.20.00.00.00.10.00.00.30.30.40.30.30.40.40.40.40.40.4
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-0.7-1.60.00.00.02.10.00.04.84.86.54.613.618.20.00.00.00.00.0

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value4.34.34.2000000000000024.14.24.13.94.03.93.94.34.34.44.23.73.93.63.63.63.73.6
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost14.435.234.733.634.733.984.885.183.083.068.368.371.064.6168.2177.30.00.00.00.00.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCostCreditIncreaseDecreaseForPlanAmendment us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCostCreditIncreaseDecreaseForPlanAmendment

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-08-31
Value300000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCostCreditIncreaseDecreaseForPlanAmendment100.0

us-gaap:DefinedBenefitPlanPlanAmendments

us-gaap:DefinedBenefitPlanPlanAmendments


Defined
Period End2020-08-31
Value-12600000.0
Percentage of DefinedBenefitPlanPlanAmendments100.0

us-gaap:DefinedBenefitPlanPlanAmendments us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage


Defined
Period End2020-08-31
Value-12600000.0
Percentage of DefinedBenefitPlanPlanAmendments100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-30
Value-17600000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-30
Value-700000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements14.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

country:US, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value13131111111110101010101010109.59.6
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.60.50.30.60.50.50.50.50.50.50.50.40.40.40.40.00.00.0
Percentage of DefinedBenefitPlanServiceCost4.53.82.55.04.24.24.84.84.84.84.93.83.93.84.20.00.00.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1.31.31.21.21.11.11.01.11.01.01.11.01.11.10.91.00.90.90.90.90.8
Percentage of DefinedBenefitPlanServiceCost9.89.810.110.19.39.39.610.69.69.610.79.610.710.69.510.40.00.00.00.00.0

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAmortizationAndAccretionNet


Depreciation
Period End2021-06-302021-03-312020-06-302020-03-31
Value128125124123
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0

us-gaap:DepreciationNonproduction

us-gaap:DepreciationNonproduction


Depreciation
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value302829282626242426262727272623232222222223202323222123232223242222212222212124222326
Percentage of DepreciationNonproduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeGainLossOnDerivativeNet

ntrs:OtherFinancialObligations, us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedge, us-gaap:OtherIncome


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-8.5-3.6-7.3-5.3-8.62.9-2.2-6.4-4.1-7.32.1-9.5-7.8-4.0-4.9-4.0-1.4
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignExchangeContract, us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedge, us-gaap:OtherIncome


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2.90.12.64.2-0.50.10.1-1.8-0.80.9-2.0-0.8-5.44.06.0-5.96.4
Percentage of DerivativeGainLossOnDerivativeNet-34.1-2.8-35.6-79.25.83.4-4.528.119.5-12.3-95.28.469.2-100.0-122.4147.5-457.1

us-gaap:ForeignExchangeContract, us-gaap:NotDesignatedAsHedgingInstrumentTrading, ntrs:ForeignExchangeTradingIncome


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value7078686171886459606678717878624949
Percentage of DerivativeGainLossOnDerivativeNet-830.6-2186.1-939.7-1162.3-829.13065.5-2931.8-932.8-1475.6-906.83719.0-754.7-1011.5-1962.5-1281.6-1227.5-3564.3

us-gaap:InterestRateContract, us-gaap:NotDesignatedAsHedgingInstrumentTrading, ntrs:SecurityCommissionsAndTradingIncome


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2.83.03.92.35.2113.74.92.81.51.71.42.91.72.42.74.4
Percentage of DerivativeGainLossOnDerivativeNet-32.9-83.3-53.4-43.4-60.5379.3-168.2-76.6-68.3-20.581.0-14.7-37.2-42.5-49.0-67.5-314.3

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value6778676267102665658617962680.01.1-9.95.0-1.2-4.0-3.5-6.01.9-3.3-6.5-4.7-8.7-5.0-10.11.5-0.70.36.7-1.6-3.07.44.4-1.7
Percentage of DerivativeGainLossOnDerivativeNet-797.6-2172.2-928.8-1184.9-783.73548.3-3004.5-881.2-1424.4-839.73804.8-661.1-879.5-0.0-22.4247.5-357.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NotDesignatedAsHedgingInstrumentEconomicHedge


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-5.6-3.5-4.7-1.1-9.13.0-2.1-8.2-4.9-6.40.1-10.3-13.20.01.1-9.95.0
Percentage of DerivativeGainLossOnDerivativeNet65.997.264.420.8105.8103.495.5128.1119.587.74.8108.4169.2-0.0-22.4247.5-357.1

us-gaap:NotDesignatedAsHedgingInstrumentTrading


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value7381726376996864636779738180655154
Percentage of DerivativeGainLossOnDerivativeNet-863.5-2269.4-993.2-1205.7-889.53444.8-3100.0-1009.4-1543.9-927.43800.0-769.5-1048.7-2005.0-1330.6-1295.0-3878.6

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1481511481481481511301331239596
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1481511481481481511301331231239596969788898887838384848578787979747575757272730.91406868686868686868
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DividendsPreferredStock

us-gaap:DividendsPreferredStock


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4.716164.819175.917175.917
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value4.716164.819175.9175.9175.9175.9175.9205.85.95.85.95.95.85.85.99.5
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Effect
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value15-101.51441473-148.473-71.43437-7.6
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeBenefitsAndShareBasedCompensation us-gaap:AwardType

us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2021-03-312020-03-31
Value4200000.04300000.0
Percentage of EmployeeBenefitsAndShareBasedCompensation100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.7122.33.53.8134.04.34.7135.44.98.2148.38.510217.87.77.69.76.66.47.28.66.16.87.58.76.46.86.87.75.96.26.59.16.35.85.98.54.34.24.46.4
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings

ntrs:VisaConversionRateSwap


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value8.53.67.35.38.6-2.92.26.73.15.1-0.68.87.54.24.34.01.52.9-2.52.34.9-0.30.60.2110.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements us-gaap:FairValueByLiabilityClass

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements

ntrs:VisaConversionRateSwap


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value4.74.34.2999999999999984.33.84.06.53.73.42.93.28.32.72.62.32.22.01.71.81.50.80.81.90.60.00.00.00.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:FederalDepositInsuranceCorporationPremiumExpense

us-gaap:FederalDepositInsuranceCorporationPremiumExpense


Federal
Period End2021-06-302021-03-312020-06-302020-03-31
Value4.13.62.92.5
Percentage of FederalDepositInsuranceCorporationPremiumExpense100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3200000.0-900000.05500000.0-400000.0-2600000.0700000.02300000.0-600000.0-1200000.0-1200000.0
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment


Financing
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-500000.06000000.0-200000.0-1300000.0-600000.02700000.00-300000.0-300000.0
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery15.6109.150.050.0-85.7117.4-0.025.025.0

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-2700000.0-900000.0-500000.0-200000.0-1300000.01300000.0-400000.0-600000.0-900000.0-900000.0
Percentage of FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery84.4100.0-9.150.050.0185.7-17.4100.075.075.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3200000.01300000.01200000.01200000.03000000.01100000.01500000.01700000.01800000.02200000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment


Financing
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value500000.0200000.0200000.01300000.0700000.0200000.00300000.0400000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery15.616.716.743.363.613.30.016.718.2

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2700000.01300000.01000000.01000000.01700000.0400000.01300000.01700000.01500000.01800000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery84.4100.083.383.356.736.486.7100.083.381.8

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.46.70.80.41.83.81.10.61.0
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment


Financing
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.20.00.00.12.90.00.00.1
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs92.50.00.05.676.30.00.010.0

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.40.50.80.41.70.91.10.60.9
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs0.0100.07.5100.0100.094.423.7100.0100.090.0

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value7.541-3.1180.025163.17.7
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment2100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2 us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.941-1.01.00.024-0.10.00.07.6
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment292.099.532.35.40.096.0-0.60.00.00.0

us-gaap:ConsumerPortfolioSegment


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.60.2-2.1170.01.0163.17.79.8
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment28.00.567.794.60.04.0100.6100.0100.00.0

us-gaap:FinancingReceivableModificationsPostModificationRecordedInvestment2 us-gaap:FinancingReceivablePortfolioSegment, us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:CommercialPortfolioSegment, ntrs:CommercialAndInstitutionalLoans


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.019-1.01.00.024-0.10.00.07.6
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment20.047.632.35.40.096.0-0.60.00.00.0

us-gaap:CommercialPortfolioSegment, us-gaap:CommercialRealEstate


Financing
Period End2021-06-302021-03-312019-06-30
Value6.9210.0
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment292.051.90.0

us-gaap:ConsumerPortfolioSegment, us-gaap:ResidentialRealEstate


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.60.2-2.1170.01.0163.17.79.8
Percentage of FinancingReceivableModificationsPostModificationRecordedInvestment28.00.567.794.60.04.0100.6100.0100.00.0

us-gaap:FinancingReceivableNonaccrualInterestIncome

us-gaap:FinancingReceivableNonaccrualInterestIncome


Financing
Period End2021-06-302021-03-312020-06-302020-03-31
Value800000.0900000.01100000.01300000.0
Percentage of FinancingReceivableNonaccrualInterestIncome100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


Foreign
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value707868617188645960667871787862494948585364605262747160465250506271594044596171878084988811579
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Foreign
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value677464586885595557
Percentage of ForeignCurrencyTransactionGainLossBeforeTax96.294.794.094.895.895.792.693.094.7

ntrs:WealthManagementSegment


Foreign
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value2.74.24.13.23.03.84.84.23.2
Percentage of ForeignCurrencyTransactionGainLossBeforeTax3.85.36.05.24.24.37.47.05.3

us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings us-gaap:IncomeStatementLocation

us-gaap:GainLossOnFairValueHedgesRecognizedInEarnings

us-gaap:InterestExpense


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value247.023-2.511-2.99.1-6.03.7-1.64.6-6.48.31.59.41.115
Percentage of GainLossOnFairValueHedgesRecognizedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncome


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-2.0-1.6-1.6-14.23.1-0.57.92.85.05.5113.56.6-3.71.9-6.71.5
Percentage of GainLossOnFairValueHedgesRecognizedInEarnings-8.2-22.9-6.7568.027.017.286.8-46.7135.1-343.8247.8-54.779.5-246.720.2-609.19.9

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillForeignCurrencyTranslationGainLoss


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value1.2-3.29.27.41.3-7.5
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-30
Value1.2-3.29.17.3
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.098.998.6

us-gaap:IncreaseDecreaseInDeposits

us-gaap:IncreaseDecreaseInDeposits


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8805-5844.119440-727.4-10531.32395610619-2051.84534-8838.2133-1298.02842-7841.164417682985-1671.835885532207388-2834.944813309-2817.7-68.940882385208257847492182-5778.34476-64.33063-8744.641631013642568795749493516-846.1
Percentage of IncreaseDecreaseInDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDerivativeAssets

us-gaap:IncreaseDecreaseInDerivativeAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1083824-919.469-2702.83570-1114.2317-64.6-292.7437-679.432161948-57.895-572.5-149.7-737.0867200-967.11318-862.9-289.5522364-22.2-505.7361-2013.818475542-122.8381-173.2-1376.31294-143.153706-250.9
Percentage of IncreaseDecreaseInDerivativeAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFederalFundsSold

us-gaap:IncreaseDecreaseInFederalFundsSold


Increase
Period End2021-06-302021-03-312020-06-302020-03-31
Value0-100000.005000000.0
Percentage of IncreaseDecreaseInFederalFundsSold0.0100.00.0100.0

us-gaap:IncreaseDecreaseInInterestPayableNet

us-gaap:IncreaseDecreaseInInterestPayableNet


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-7.77.3-18.611-10.4-5.7-14.4-3.9-1.7-3.62.4137.05.7-5.88.22.45.9-0.81.4-3.02.3-2.32.9-2.6-6.2-1.67.3-10.1-0.13.5-2.56.6-18.8-11.22.712-13.83.4121.0-11.813-1.714-18.4
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value126643-87.0-83.3122-278.3-141.7365105-44.03312779-15.863655.64839-53.9952.9-14.478-50.32198-395.4254178122-126.8326.3134.517284-10.2-129.234-25.2167-51.0-0.3
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value768900.0833620.016331.0582300.0499720.0935690.044386.01029800.01030500.01033400.0-55988.01417200.01403800.01366400.0-40748.01302800.01441300.01571300.091422.01515100.01661300.01360600.0-32477.01931500.02083800.01907500.016558.02036100.01741000.01842600.046698.01400600.01302100.01021700.0-944.0460050.0467140.0466000.0-78883.0202500.0427860.0843470.018373.033966.0551270.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndDividendIncomeOperating

us-gaap:InterestAndDividendIncomeOperating


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value343349352355406529576620640662648599567505488453417410371349344352330305288298303293293295302291275286302323321341354347359347334330317314
Percentage of InterestAndDividendIncomeOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseDeposits

us-gaap:InterestExpenseDeposits


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-14.8-13.4-8.3-3.5-0.7608512213314713810577635855412720202122211718161721222023252529334332464350706665534139
Percentage of InterestExpenseDeposits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseFederalFundsPurchased

us-gaap:InterestExpenseFederalFundsPurchased


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-0.50.10.10.10.02.03.12.47.1131516135.34.74.30.90.50.50.40.30.30.30.10.10.20.20.50.30.30.50.40.30.30.10.10.60.40.10.10.61.00.91.01.61.3
Percentage of InterestExpenseFederalFundsPurchased100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseJuniorSubordinatedDebentures

us-gaap:InterestExpenseJuniorSubordinatedDebentures


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.50.60.60.41.51.71.82.12.12.22.12.01.91.51.31.41.11.11.00.90.80.80.70.60.50.60.50.60.50.60.60.60.60.60.60.70.70.80.60.60.60.60.60.80.60.4
Percentage of InterestExpenseJuniorSubordinatedDebentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseOtherLongTermDebt

us-gaap:InterestExpenseOtherLongTermDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5.35.35.45.77.08.48.99.410.010.01011121110119.67.47.16.86.46.15.65.55.57.88.79.29.4109.68.08.9101313151921212415-37.2282811
Percentage of InterestExpenseOtherLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseOtherShortTermBorrowings

us-gaap:InterestExpenseOtherShortTermBorrowings


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value3.23.54.75.06.4293646494947403526181410.07.65.65.74.02.71.71.01.11.21.00.90.80.70.80.81.00.70.71.21.21.01.21.41.7
Percentage of InterestExpenseOtherShortTermBorrowings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase

us-gaap:InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.00.00.01.01.01.62.11.81.71.52.02.72.01.81.30.90.80.50.60.40.10.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.30.30.20.30.2
Percentage of InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase0.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeDepositsWithFinancialInstitutions

us-gaap:InterestIncomeDepositsWithFinancialInstitutions


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2.72.42.42.74.51216181917161518191816141414151623262728263130333236363435374443506149443733403133
Percentage of InterestIncomeDepositsWithFinancialInstitutions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss

us-gaap:InterestIncomeExpenseAfterProvisionForLoanLoss


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value362370336328306347421424423422421417411387393361348354346306302305307278261265260249246242244232215221229235249251259239236219182203182190
Percentage of InterestIncomeExpenseAfterProvisionForLoanLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxExempt

us-gaap:InterestIncomeSecuritiesTaxExempt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.40.40.30.30.30.50.70.91.01.11.51.71.92.02.32.32.52.62.52.21.61.11.11.11.21.31.51.61.82.22.62.73.03.33.84.14.55.25.96.16.36.87.47.37.37.5
Percentage of InterestIncomeSecuritiesTaxExempt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeSecuritiesTaxable

us-gaap:InterestIncomeSecuritiesTaxable


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value16517318018220824125826526927726923821917717214313514312510396103978177767665636969604858596365626354554943475044
Percentage of InterestIncomeSecuritiesTaxable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentCompanyVoluntaryFeeWaived

us-gaap:InvestmentCompanyVoluntaryFeeWaived


Investment
Period End2021-06-302021-03-312020-06-302019-06-30
Value79500.30.0
Percentage of InvestmentCompanyVoluntaryFeeWaived100.0100.0100.00.0

us-gaap:LoanProcessingFee us-gaap:LoansInsuredOrGuaranteedByGovernmentAuthorities

us-gaap:LoanProcessingFee

ntrs:PaycheckProtectionProgram


Loan
Period End2021-06-302021-03-312020-12-31
Value100000.02600000.00
Percentage of LoanProcessingFee100.0100.00.0

us-gaap:MarketableSecuritiesGainLoss

us-gaap:MarketableSecuritiesGainLoss


Marketable
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-500000.00100000.00-500000.0-400000.0-300000.0-200000.0-700000.0-100000.00-200000.0-500000.0-400000.0-400000.0-300000.0-1300000.0200000.0-2400000.0300000.000-400000.0100000.0-1000000.0300000.0400000.0-4000000.0400000.0-2200000.0100000.0200000.00200000.0500000.0
Percentage of MarketableSecuritiesGainLoss100.00.0100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:NoninterestExpense

us-gaap:NoninterestExpense


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1120111711511094103610651072103610061028102110029979951001935937894873843925828824812854789781774811768794740729728741696717723771701705652641622614619
Percentage of NoninterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestExpense us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value703713730707655659675649633
Percentage of NoninterestExpense62.863.863.564.663.261.962.962.662.9

ntrs:TreasuryAndOtherSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value181.3131.19.3113.61.20.8
Percentage of NoninterestExpense1.70.11.20.10.91.10.30.10.1

ntrs:WealthManagementSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value398403407386372394393385372
Percentage of NoninterestExpense35.636.135.435.335.937.036.737.237.0

us-gaap:NoninterestIncome

us-gaap:NoninterestIncome


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value12441243118711561134117911261120108910581086106610921092104499197993091791010178828678861004873866829835794795810800750735726734709683714698663674656731667
Percentage of NoninterestIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncome us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value748755715700703701663669651
Percentage of NoninterestIncome60.160.760.360.562.059.558.859.759.8

ntrs:TreasuryAndOtherSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value-8.5-3.6-7.3-5.3-8.62.9-2.2-6.7-3.1
Percentage of NoninterestIncome-0.7-0.3-0.6-0.5-0.80.2-0.2-0.6-0.3

ntrs:WealthManagementSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value504491479461439475466457440
Percentage of NoninterestIncome40.639.540.439.938.740.341.440.940.5

us-gaap:NoninterestIncomeOther

us-gaap:NoninterestIncomeOther


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value9810092911018770857363745571757174817464681757367741737477657565709971
Percentage of NoninterestIncomeOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoninterestIncomeOther us-gaap:StatementBusinessSegments

ntrs:CorporateAndInstitutionalServiceSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value686055566941365344
Percentage of NoninterestIncomeOther69.859.859.362.268.248.051.963.161.2

ntrs:TreasuryAndOtherSegment


Noninterest
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value-8.5-3.6-5.3-8.62.9-6.7-3.1
Percentage of NoninterestIncomeOther-8.6-3.6-5.8-8.53.3-7.9-4.2

ntrs:WealthManagementSegment


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value384445394042363831
Percentage of NoninterestIncomeOther38.843.848.643.640.348.751.344.843.0

us-gaap:NoninterestIncomeOtherOperatingIncome

us-gaap:NoninterestIncomeOtherOperatingIncome


Noninterest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5454495356343245382940203134344043392833141383338137384134403738673624354634383742423542273739
Percentage of NoninterestIncomeOtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OccupancyNet

us-gaap:OccupancyNet


Occupancy
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value52506751605157535051495148515247464547444540434343434543474443434343464342414945434240424142
Percentage of OccupancyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:ForeignExchangeContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.2-2.5106.6-1.813-2.50.79.47.2
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.20.00.40.10.10.80.6
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent-3.0-0.03.0-4.014.38.58.3

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.4-1.335120.5-1.3-48.20.10.011
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent-9.552.0329.6190.9-27.8-9.81928.014.30.0156.9

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value149-496.5-30.045424266-102.976217115
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent3569.019860.0-277.8686.4-23588.92006.04116.010871.42314.91601.4

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent

us-gaap:ForeignExchangeContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.1-1.88.05.0-1.410.0-1.90.57.15.5
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Oci
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.20.00.30.10.10.60.4
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent-4.0-0.03.0-5.320.08.57.3

us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.5-1.0269.50.5-1.2-37.20.100000000000000940.08.2
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent16.155.6328.8190.0-35.7-12.01957.920.00.0149.1

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value112-369.7-23.933318199-76.35616285
Percentage of OciBeforeReclassificationsNetOfTaxAttributableToParent3632.320538.9-298.8670.0-22728.61997.04015.811340.02285.91552.7

us-gaap:OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax us-gaap:StatementEquityComponents

us-gaap:OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Oci
Period End2021-06-30
Value104
Percentage of OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax100.0

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal


Off
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-8.6-6.016-4.18.611-2.1-1.3-1.6-0.7
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal us-gaap:FinancingReceivablePortfolioSegment

us-gaap:CommercialPortfolioSegment


Off
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-8.1-5.917-6.07.311-2.0-0.7-2.0-0.6
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal94.298.3108.0146.384.995.795.253.8125.085.7

us-gaap:ConsumerPortfolioSegment


Off
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-0.5-0.1-1.31.91.30.5-0.1-0.60.4-0.1
Percentage of OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal5.81.7-8.0-46.315.14.34.846.2-25.014.3

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:ForeignExchangeContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.1-0.71.6-0.43.30.22.31.78.42.83.13.2
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.00.10.00.20.20.00.00.0-0.4
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax0.0-0.03.00.08.711.80.00.00.0-12.5

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-0.9-0.33.10.0-0.10.00.03.1-12.00.00.02.5-25.1-0.20.00.0-11.20.00.00.0-8.20.00.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax-81.842.9193.8-0.0-3.00.00.0182.4-142.90.00.078.10.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value37-126.8111066719552928-10.7-6.5-20.4-38.4-1.00.8
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax3390.918114.3737.5-26600.02033.39700.02404.31758.8338.1-382.1-209.7-637.50.00.00.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value165-468.0-20.946427338-160.5113245149
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent us-gaap:StatementEquityComponents

ntrs:AccumulatedTranslationAdjustmentMemberAccumulatedForeignCurrencyAdjustmentAttributableToParentOtherMember


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value10-57.39250-89.8-71.99.0
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent6.112.2199.811.9-26.5-63.53.7

ntrs:LongtermIntraentityForeignCurrencyTransactionGainsLosses


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.4-0.21.41.20.1-0.60.8-1.3-0.70.7
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent0.20.0-6.72.60.0-0.2-0.5-1.1-0.30.5

ntrs:NetInvestmentHedgeGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-12.182-148.9-117.4-55.0142-84.41077.928
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent-7.3-17.7712.4-254.7-12.942.252.695.13.219.2

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value29104623119.5-42.65.65.616
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent17.6-2.2-222.050.32.62.826.54.92.311.2

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.0-7.0-6.31.7-4.39.7-7.7-3.26.4-5.8
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent2.41.530.13.7-1.02.94.8-2.82.6-3.9

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value134-496.5-29.545424266-102.476217115
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent81.0106.1141.198.399.478.963.867.588.577.4

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-1.625-31.5-24.1-4.252-7.8341622
Percentage of OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent-1.0-5.4150.7-52.3-1.015.54.930.46.615.3

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3000000.0-5200000.0-4800000.01300000.0-3300000.07300000.0-5800000.0-2400000.04800000.0-4300000.010000000.0-4200000.0-3500000.0-3700000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:ForeignExchangeContract, ntrs:OtherNoninterestIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-2.5-1.00.10.3-0.1-0.1-0.31.40.3-0.60.20.21.12.40.81.7
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignExchangeContract, us-gaap:InterestIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.75.5164.22.54.15.62.73.714191716147.24.2
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-108.0-550.016600.01400.0-2500.0-4100.0-1866.7192.91233.3-2400.09950.08650.01454.5591.7900.0247.1

us-gaap:InterestRateContract, us-gaap:InterestIncome


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.20.20.10.00.0-0.1-0.2-0.20.0-0.1-0.10.00.10.1
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax200.066.7-100.0-0.0-0.0-7.1-66.733.30.0-50.0-9.10.012.55.9

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax us-gaap:IncomeStatementLocation

ntrs:OtherNoninterestIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-2.5-1.00.10.3-0.1-0.1-0.31.40.3-0.60.20.21.12.40.81.7
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.75.5164.42.64.15.62.63.514191715147.34.3
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax-108.0-550.016800.01466.7-2600.0-4100.0-1866.7185.71166.7-2366.79950.08600.01445.5591.7912.5252.9

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value128-362.13.554325239-103.768185108
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

ntrs:AccumulatedTranslationAdjustmentMemberAccumulatedForeignCurrencyAdjustmentAttributableToParentOtherMember


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value10-56.88943-80.2-69.98.7
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent8.515.7164.513.3-33.5-101.64.7

ntrs:LongtermIntraentityForeignCurrencyTransactionGainsLosses


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.2-0.11.10.90.1-0.50.6-1.0-0.50.5
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent0.20.031.41.70.0-0.2-0.6-1.5-0.30.5

ntrs:NetInvestmentHedgeGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-9.061-112.4-88.1-41.3106-60.4805.919
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent-7.0-17.1-3211.4-162.8-12.744.458.2117.43.217.7

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value227.834178.67.0-32.94.34.212
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent17.7-2.2982.932.32.62.931.76.22.311.3

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.0-5.2-4.81.3-3.37.3-5.8-2.44.8-4.3
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent2.31.4-137.12.4-1.03.05.6-3.52.6-4.0

us-gaap:AccumulatedNetUnrealizedInvestmentGainLoss


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value100-369.7-23.5000000000000633318199-76.15716285
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent78.3102.1-671.461.997.883.373.482.887.579.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value128-362.15432523968185108
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedTranslationAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.15.0-2.61.82.025119.91414
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent1.6-1.4-74.33.30.610.7-10.714.47.613.7

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-22.8-7.8-34.4-17.5-8.6-7.032-4.3-4.2-12.332-6.9-7.4-5.727-4.3-4.3-2.015-3.3-4.0-4.1-1.4-6.1-6.1-6.291-3.5-3.6-3.4-111.7-7.1-7.0-7.057-5.3-5.3-22.289-4.8-5.7
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1

us-gaap:OtherComprehensiveIncomeLossTaxPortionAttributableToParent1