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Financial Derivatives (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Derivative [Line Items]      
Cash and securities held to collateralize net derivative assets $ 3,000,000,000.0    
Cash and securities pledged to collateralize net derivative liabilities 2,000,000,000.0    
Derivative, net liability position, aggregate fair value 3,500,000,000    
Collateral already posted, aggregate fair value 2,400,000,000    
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 1,100,000,000    
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]      
Derivative [Line Items]      
Cash flow hedge gain (loss) to be reclassified within twelve months 491,000,000    
Cash flow hedge gain (loss) to be reclassified within twelve months, net of tax $ 388,000,000    
Maximum length of time hedged in cash flow hedge 10 years    
Gain (loss) from components excluded from assessment of cash flow hedge effectiveness, net $ 0 $ 0  
Gain (loss) on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net 0 0  
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  
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 $ 0
Derivative instruments, gain (loss) reclassified from accumulated oci into income, effective portion, net $ 75,000,000 $ (18,000,000)