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Financial Derivatives (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative [Line Items]        
Cash and securities held to collateralize net derivative assets $ 1,600,000,000   $ 1,600,000,000  
Cash and securities pledged to collateralize net derivative liabilities 3,400,000,000   3,400,000,000  
Derivative, net liability position, aggregate fair value 3,500,000,000   3,500,000,000  
Collateral already posted, aggregate fair value 2,800,000,000   2,800,000,000  
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 700,000,000   700,000,000  
Cash flow hedges | Interest Rate Contracts        
Derivative [Line Items]        
Cash flow hedge gain (loss) to be reclassified within twelve months     312,000,000  
Cash flow hedge gain (loss) to be reclassified within twelve months, net of tax     $ 240,000,000  
Maximum length of time hedged in cash flow hedge     10 years  
Net investment hedges | Foreign exchange contracts:        
Derivative [Line Items]        
Derivative instruments, gain (loss) reclassified from accumulated oci into income, effective portion, net 28,000,000 $ (42,000,000) $ 20,000,000 $ 38,000,000
Gain loss from components excluded from assessment of net investment hedge effectiveness net $ 0 $ 0 $ 0 $ 0