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Derivatives (Derivative Financial Instruments - Additional Information) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2009
Derivative      
Valuation adjustments related to the credit risk associated with counterparties of customer accommodation derivative contracts $ 6 $ 9  
Maximum Length Of Time Hedged In Interest Rate Cash Flow Hedge 3 years    
Notional amount of the risk participations agreements $ 2,467 1,664  
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants     51.00%
Credit Risk      
Derivative      
Credit Risk Derivatives Average Life 3 years 1 month 6 days    
Cash Flow Hedging      
Derivative      
Gains or Losses Reclassified from AOCI into Earnings $ 0 0  
Interest Rate Contract      
Derivative      
Fair value of risk participation agreements 4 3  
Interest Rate Contract | Cash Flow Hedging      
Derivative      
Deferred gains, net of tax, on cash flow hedges were recorded in accumulated other comprehensive income 10 22  
Net deferred gains, net of tax, recorded in accumulated other comprehensive income are expected to be reclassified into earnings 15    
Total collateral      
Derivative      
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 444 821  
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 399 $ 504