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Financial Derivatives (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]      
Cash And Securities Held To Collateralize Net Derivative Assets $ 1,100    
Cash And Securities Pledged To Collateralize Net Derivative Liabilities 1,400    
Aggregate fair value of all derivative instruments with credit-risk-related contingent features 1,700    
Collateral posted on derivative instruments with credit-risk-related contingent features 1,200    
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 500    
Risk Participation Agreements Sold      
Derivative [Line Items]      
Derivative Liability, Notional Amount 8,000 $ 6,000  
Credit Derivative, Maximum Exposure, Undiscounted 300 200  
Cash Flow Hedging | Interest Rate Contract      
Derivative [Line Items]      
Cash flow hedge gain (loss) to be reclassified within twelve months 164    
Cash flow hedge gain (loss) to be reclassified within twelve months, net of tax $ 129    
Maximum length of time over which forecasted loan cash flows are hedged 10 years    
Net Investment Hedging | Foreign Exchange Contract      
Derivative [Line Items]      
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, before Tax $ (24) $ 76 $ (81)