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Financial Derivatives (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]      
Cash And Securities Held To Collateralize Net Derivative Assets $ 900,000,000    
Cash And Securities Pledged To Collateralize Net Derivative Liabilities 1,500,000,000    
Aggregate fair value of all derivative instruments with credit-risk-related contingent features 1,600,000,000    
Collateral posted on derivative instruments with credit-risk-related contingent features 800,000,000    
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 800,000,000    
Risk Participation Agreements Sold      
Derivative [Line Items]      
Derivative Liability, Notional Amount 3,600,000,000 $ 4,300,000,000  
Credit Derivative, Maximum Exposure, Undiscounted 100,000,000 100,000,000  
Fair Value Hedging | Interest Rate Contract      
Derivative [Line Items]      
Gain Loss From Components Excluded From Assessment Of Fair Value Hedge Effectiveness Net $ 0 0 $ 0
Cash Flow Hedging | Interest Rate Contract      
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 0
Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net 0 0 0
Cash Flow Hedging | Interest Rate Contract | Pretax      
Derivative [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 102,000,000    
Cash Flow Hedging | Interest Rate Contract | After Tax      
Derivative [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 81,000,000    
Net Investment Hedging | Foreign Exchange Contract      
Derivative [Line Items]      
Gain Loss From Components Excluded From Assessment Of Net Investment Hedge Effectiveness Net 0 0 0
Amount Of Ineffectiveness On Net Investment Hedges 0 0 0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ (81,000,000) $ 186,000,000 $ 60,000,000