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Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Charge off threshold - small business commercial loans $ 1,000,000pnc_ChargeOffThresholdCommercialLoansSmallBusiness    
Equity investments 10,728,000,000pnc_EquityInvestments [1],[2] 10,560,000,000pnc_EquityInvestments [1],[2]  
Cumulative effect of adopting ASU 2014-01 [Member]      
Cumulative effect adjustment     (38,000,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_NewAccountingPronouncementEarlyAdoptionEffectMember		 [3]
Cumulative effect of adopting ASU 2014-01 [Member] | Low Income Housing Tax Credit Investments [Member]      
Amortization recognized for low income housing tax credits associated with adoption of ASU 2014-01 181,000,000pnc_AmortizationRecognizedLowIncomeHousingTaxCreditInvestments
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_NewAccountingPronouncementEarlyAdoptionEffectMember
/ us-gaap_FinancialInstrumentAxis
= pnc_LowIncomeHousingTaxCreditInvestmentsMember		    
Tax credits recognized for low income housing tax credits associated with adoption of ASU 2014-01 212,000,000pnc_TaxCreditsRecognizedLowIncomeHousingTaxCreditInvestments
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_NewAccountingPronouncementEarlyAdoptionEffectMember
/ us-gaap_FinancialInstrumentAxis
= pnc_LowIncomeHousingTaxCreditInvestmentsMember		    
Other tax benefits recognized for low income housing tax credits associated with adoption of ASU 2014-01 66,000,000pnc_OtherTaxBenefitsRecognizedLowIncomeHousingTaxCreditInvestments
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_NewAccountingPronouncementEarlyAdoptionEffectMember
/ us-gaap_FinancialInstrumentAxis
= pnc_LowIncomeHousingTaxCreditInvestmentsMember		    
Equity investments 1,800,000,000pnc_EquityInvestments
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_NewAccountingPronouncementEarlyAdoptionEffectMember
/ us-gaap_FinancialInstrumentAxis
= pnc_LowIncomeHousingTaxCreditInvestmentsMember		    
Retained Earnings [Member] | Cumulative effect of adopting ASU 2014-01 [Member]      
Cumulative effect adjustment     $ (43,000,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_NewAccountingPronouncementEarlyAdoptionEffectMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 [3]
[1]
Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).
[2]
Amounts for 2013 period have been updated to reflect the first quarter 2014 adoption of ASU 2014-01 related to investments in low income housing tax credits.
[3]
Amounts for 2012 and 2013 periods have been updated to reflect the first quarter 2014 adoption of ASU 2014-01 related to investments in low income housing tax credits. See Note 1 Accounting Policies for further detail of the adoption.