Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2009
Derivative [Line Items]
Valuation adjustments related to the credit risk associated with counterparties of customer accommodation derivative contracts	$ 9	$ 16
Maximum Length Of Time Hedged In Interest Rate Cash Flow Hedge	4 years
Notional amount of the risk participations agreements	$ 1,664	1,113
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants			51.00%
Credit Risk
Derivative [Line Items]
Credit Risk Derivatives Average Life	3 years 2 months 12 days
Interest Rate Contract
Derivative [Line Items]
Fair value of risk participation agreements	$ 3	2
Interest Rate Contract | Cash Flow Hedging
Derivative [Line Items]
Deferred gains, net of tax, on cash flow hedges were recorded in accumulated other comprehensive income	22	23
Net deferred gains, net of tax, recorded in accumulated other comprehensive income are expected to be reclassified into earnings	25
Total collateral
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	821	830
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 504	$ 574