Investments in Qualified Affordable Housing Tax Credits (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Noninterest Expense
Schedule of Equity Method Investments [Line Items]
Pre-tax investment and impairment losses	[1]	$ 126	$ 118	$ 90
Applicable income tax expense
Schedule of Equity Method Investments [Line Items]
Tax credits and other benefits		$ (205)	$ (185)	$ (164)

[1] The Bancorp did not recognize impairment losses resulting from the forfeiture or ineligibility of tax credits or other circumstances during the years ended December 31, 2015, 2014 and 2013.