Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended			3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2009	Sep. 30, 2014 Credit Risk	Sep. 30, 2014 Interest Rate Contract	Dec. 31, 2013 Interest Rate Contract	Sep. 30, 2014 Interest Rate Contract Cash Flow Hedging	Dec. 31, 2013 Interest Rate Contract Cash Flow Hedging	Sep. 30, 2014 Interest Rate Contract Lender Concentration Risk	Dec. 31, 2013 Interest Rate Contract Lender Concentration Risk	Sep. 30, 2014 Total collateral (up to and exceeding 100% of the net position)	Dec. 31, 2013 Total collateral (up to and exceeding 100% of the net position)
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral											$ 659	$ 514
Valuation adjustments related to the credit risk associated with counterparties of customer accomodation derivative contracts	8	12
Derivative Liability, Fair Value, Amount Offset Against Collateral											495	559
Maximum length of time hedged in cash flow hedge	5 years 2 months
Deferred gains, net of tax, on cash flow hedges were recorded in accumulated other comprehensive income							12	13
Net deferred gains, net of tax, recorded in accumulated other comprehensive income are expected to be reclassified into earnings during the next twelve months							30
Notional amount of the risk participation agreements									1,237	1,203
Credit Risk Derivatives Average Remaining Life				2 years 8 months 12 days
Fair value of risk participation agreements					$ 2	$ 3
Percentage of Vantiv Holding, LLC sold to Advent for cash and warrants			51.00%