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Financial Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Derivative [Line Items]      
Cash And Securities Held To Collateralize Net Derivative Assets $ 900    
Cash And Securities Pledged To Collateralize Net Derivative Liabilities 1,300    
Aggregate fair value of all derivative instruments with credit-risk-related contingent features 1,200    
Collateral posted on derivative instruments with credit-risk-related contingent features 1,000    
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    
Risk Participation Agreements Sold [Member]      
Derivative [Line Items]      
Credit Derivative Maximum Exposure Undiscounted 166   $ 122
Derivative Liability Notional Amount $ 3,200   $ 2,500
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]      
Derivative [Line Items]      
Maximum length of time over which forecasted loan cash flows are hedged 6 years    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net $ 265 $ 298  
Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | Pretax [Member]      
Derivative [Line Items]      
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months 198    
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 129    
Net Investment Hedging [Member]      
Derivative [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net $ 29 $ 54  
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 $ 45    
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 $ 29