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Financial Derivatives (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative [Line Items]    
Increase (Decrease) in Derivative Assets $ (1,300,000,000)  
Increase (Decrease) in Derivative Liabilities (500,000,000)  
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months 38,000,000  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax 30,000,000  
Cash And Securities Held To Collateralize Net Derivative Assets 200,000,000  
Cash And Securities Pledged To Collateralize Net Derivative Liabilities 1,400,000,000  
Derivative, Net Liability Position, Aggregate Fair Value 1,900,000,000  
Collateral already posted, aggregate fair value 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 1,200,000,000  
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]    
Derivative [Line Items]    
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net $ 0 $ 0
Maximum length of time over which forecasted loan cash flows are hedged 7 years  
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Amount Of Ineffectiveness On Net Investment Hedges $ 0 0
Gain Loss From Components Excluded From Assessment Of Net Investment Hedge Effectiveness Net 0 0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net 39,000,000 14,000,000
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