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Financial Derivatives (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Cash And Securities Held To Collateralize Net Derivative Assets $ 900,000,000    
Cash And Securities Pledged To Collateralize Net Derivative Liabilities 900,000,000    
Aggregate fair value of all derivative instruments with credit-risk-related contingent features 800,000,000    
Collateral posted on derivative instruments with credit-risk-related contingent features 600,000,000    
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered 200,000,000    
Risk Participation Agreements Sold [Member]      
Derivative [Line Items]      
Credit Derivative Maximum Exposure Undiscounted 122,000,000 $ 124,000,000  
Derivative Liability Notional Amount $ 2,500,000,000 2,800,000,000  
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]      
Derivative [Line Items]      
Maximum length of time over which forecasted loan cash flows are hedged 7 years    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net $ 415,000,000 431,000,000 $ (141,000,000)
Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | Pretax [Member]      
Derivative [Line Items]      
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months 190,000,000    
Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | After Tax [Member]      
Derivative [Line Items]      
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months 124,000,000    
Net Investment Hedging [Member]      
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net $ 60,000,000 $ 54,000,000 $ (21,000,000)
Forward Contracts [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member]      
Derivative [Line Items]      
Maximum length of time over which forecasted loan cash flows are hedged 2 months    
Forward Contracts [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | Pretax [Member]      
Derivative [Line Items]      
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months $ 24,000,000    
Forward Contracts [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | After Tax [Member]      
Derivative [Line Items]      
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months $ 16,000,000