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Label Element Value
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]  
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (408,000,000)
Common Stock [Member]  
Common Stock, Shares, Outstanding us-gaap_CommonStockSharesOutstanding 457,000,000
Common Stock, Shares, Outstanding us-gaap_CommonStockSharesOutstanding 433,000,000
AOCI Attributable to Parent [Member]  
Accumulated Other Comprehensive Income (Loss), Net of Tax us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 799,000,000
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]  
Accumulated Other Comprehensive Income Loss Available For Sale Otti Securities Adjustment Net Of Tax pnc_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleOttiSecuritiesAdjustmentNetOfTax 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]  
Accumulated Other Comprehensive Income Loss Available For Sale Non Otti Securities Adjustment Net Of Tax pnc_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleNonOttiSecuritiesAdjustmentNetOfTax 1,067,000,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]  
Accumulated Other Comprehensive Income (Loss), Cash Flow Hedge, After Reclassification And Tax pnc_AccumulatedOtherComprehensiveIncomeLossCashFlowHedgeAfterReclassificationAndTax 276,000,000
AOCI Attributable to Parent, Other [Member]  
Accumulated Other Comprehensive Income Loss Other Net Of Tax End Balance pnc_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTaxEndBalance (136,000,000)
Cumulative Effect, Period Of Adoption, Adjusted Balance [Member]  
Financing Receivable, Allowance for Credit Loss us-gaap_FinancingReceivableAllowanceForCreditLosses 3,205,000,000
Financing Receivable, Allowance for Credit Loss And Off-Balance Sheet, Credit Loss, Liability pnc_FinancingReceivableAllowanceforCreditLossAndOffBalanceSheetCreditLossLiability 3,702,000,000
Cumulative Effect, Period Of Adoption, Adjusted Balance [Member] | Consumer Portfolio Segment [Member]  
Financing Receivable, Allowance for Credit Loss us-gaap_FinancingReceivableAllowanceForCreditLosses 1,697,000,000
Cumulative Effect, Period Of Adoption, Adjusted Balance [Member] | Commercial Portfolio Segment [Member]  
Financing Receivable, Allowance for Credit Loss us-gaap_FinancingReceivableAllowanceForCreditLosses 1,508,000,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period Of Adoption, Adjustment [Member] | Consumer Portfolio Segment [Member]  
Financing Receivable, Allowance for Credit Loss us-gaap_FinancingReceivableAllowanceForCreditLosses 767,000,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period Of Adoption, Adjustment [Member] | Commercial Portfolio Segment [Member]  
Financing Receivable, Allowance for Credit Loss us-gaap_FinancingReceivableAllowanceForCreditLosses $ (304,000,000)