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Financial Derivatives (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]      
Increase (Decrease) in Derivative Assets $ (1,500)    
Increase (Decrease) in Derivative Liabilities (700)    
Cash And Securities Held To Collateralize Net Derivative Assets 400    
Cash And Securities Pledged To Collateralize Net Derivative Liabilities 1,200    
Aggregate fair value of all derivative instruments with credit-risk-related contingent features 1,500    
Collateral posted on derivative instruments with credit-risk-related contingent features 1,000    
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 500    
Risk Participation Agreements Sold      
Derivative [Line Items]      
Derivative Liability, Notional Amount 6,000 $ 3,600  
Credit Derivative, Maximum Exposure, Undiscounted 200 100  
Cash Flow Hedging | Interest Rate Contract      
Derivative [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (35)    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax $ (27)    
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 $ 76 $ (81) $ 186