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Financial Derivatives (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative [Line Items]        
Cash and securities held to collateralize net derivative assets $ 1,000,000,000.0   $ 1,000,000,000.0  
Cash and securities pledged to collateralize net derivative liabilities 1,400,000,000   1,400,000,000  
Derivative, net liability position, aggregate fair value 1,500,000,000   1,500,000,000  
Collateral already posted, aggregate fair value 1,100,000,000   1,100,000,000  
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 400,000,000   400,000,000  
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]        
Derivative [Line Items]        
Cash flow hedge gain (loss) to be reclassified within twelve months     115,000,000  
Cash flow hedge gain (loss) to be reclassified within twelve months, net of tax     $ 91,000,000  
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 $ 0 $ 0
Gain (loss) on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net 0 0 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 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 0
Derivative instruments, gain reclassified from accumulated oci into income, effective portion, net $ 32,000,000 $ 69,000,000 $ 14,000,000 $ 30,000,000