Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used for Risk Management and Other Business Purposes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Interest Rate Contract | Forward Contracts | Loans Held-for-Sale | Mortgage Banking Revenue | Residential Mortgage
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	$ 8		$ (18)	$ 24
Interest Rate Contract | Servicing Rights | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	90		95	(30)
Foreign Exchange Contract | Forward Contracts | Other Noninterest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	23		14	5
Equity Contract | Warrant | Other Noninterest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	325	[1]	31	206
Equity Contract | Swap | Other Noninterest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recorded in earnings	$ (37)		$ (38)	$ (31)

[1] The Bancorp recognized a net gain of $89 million on both the sale and exercise of the warrant during the fourth quarter of 2015.