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Financial Derivatives (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]      
Gain (loss) on net investment hedge derivatives $ 119,000,000 $ 0 $ 0
Cash and securities held to collateralize net derivative assets 1,500,000,000    
Cash and securities pledged to collateralize net derivative liabilities 2,500,000,000    
Aggregate fair value of all derivative instruments with credit-risk-related contingent features 5,800,000,000 2,400,000,000  
Collateral posted on derivative instruments with credit-risk-related contingent features 1,700,000,000 1,800,000,000  
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 4,100,000,000 600,000,000  
Cash Flow Hedging | Interest Rate Contract      
Derivative [Line Items]      
Cash flow hedge gain (loss) to be reclassified within twelve months 1,400,000,000    
Cash flow hedge gain (loss) to be reclassified within twelve months, net of tax $ 1,100,000,000    
Maximum length of time over which forecasted loan cash flows are hedged 10 years    
Net Investment Hedging | Foreign Exchange Contract      
Derivative [Line Items]      
Gain (loss) from components excluded from assessment of net investment hedge effectiveness net $ 0 $ 0 $ 0