Derivatives (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, 2016		Dec. 31, 2015		Dec. 31, 2014
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ 24		$ 90		$ 95
Interest Rate Contract | Forward Contracts | Loans Held-for-Sale | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	14		8		(18)
Interest Rate Contract | Servicing Rights | Mortgage Banking Revenue | Residential Mortgage
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	24		90		95
Foreign Exchange Contract | Forward Contracts | Other Noninterest Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	2		23		14
Equity Contract | Warrant | Other Noninterest Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	73	[1]	325	[1]	31
Equity Contract | Swap | Other Noninterest Income
Derivative Instruments, Gain (Loss)
Net gains (losses) recorded in earnings	$ (56)		$ (37)		$ (38)

[1] a) The Bancorp recognized a net gain of $ 9 on the exercise of the remaining warrant during the fourth quarter of 2016 and a net gain of $89 on both the sale and partial exercise of the warrant during the fourth quarter of 2015