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Financial Derivatives (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]        
Cash And Securities Held To Collateralize Net Derivative Assets $ 700,000,000   $ 700,000,000  
Cash And Securities Pledged To Collateralize Net Derivative Liabilities 1,500,000,000   1,500,000,000  
Aggregate fair value of all derivative instruments with credit-risk-related contingent features 1,100,000,000   1,100,000,000  
Collateral posted on derivative instruments with credit-risk-related contingent features 700,000,000   700,000,000  
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 400,000,000   400,000,000  
Fair Value Hedging [Member] | Interest Rate Contracts [Member]        
Derivative [Line Items]        
Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net     $ 0 $ 0
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]        
Derivative [Line Items]        
Maximum length of time over which forecasted loan cash flows are hedged     7 years  
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net     $ 0 0
Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net     $ 0 0
Cash Flow Hedge Ineffectiveness Is Immaterial     Cash flow hedge ineffectiveness was not significant for the periods presented.  
Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | Pretax [Member]        
Derivative [Line Items]        
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months     $ 143,000,000  
Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | After Tax [Member]        
Derivative [Line Items]        
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months     93,000,000  
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Gain Loss From Components Excluded From Assessment Of Net Investment Hedge Effectiveness Net     0 0
Amount Of Ineffectiveness On Net Investment Hedges     0 0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net $ 26,000,000 $ 27,000,000 $ 76,000,000 $ 136,000,000