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Derivatives (Derivative Financial Instruments - Additional Information) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2009
Derivative      
Derivative Asset, Fair Value, Amount Not Offset Against Collateral $ 481 $ 409  
Valuation adjustments related to the credit risk associated with counterparties of customer accommodation derivative contracts 3 3  
Derivative Liability, Fair Value, Amount Offset Against Collateral $ 551 365  
Maximum Length Of Time Hedged In Interest Rate Cash Flow Hedge 6 years    
Notional amount of the risk participations agreements $ 4,002 2,838,000  
Credit Risk Derivatives Average Life 3 years 6 months 4 days    
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants     51.00%
Amount of variation margin payment applied to derivative asset contracts $ 249    
Amount of variation margin payment applied to derivative liability contracts 23    
Interest Rate Contract      
Derivative      
Fair value of risk participation agreements 8 5  
Interest Rate Contract | Cash Flow Hedging      
Derivative      
Deferred gains, net of tax, on cash flow hedges were recorded in accumulated other comprehensive income 160 $ 9  
Net deferred gains or losses, net of tax, recorded in AOCI are expected to be reclassified into earnings $ 10