Investments in Qualified Affordable Housing Tax Credits (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other noninterest expense
Investments In Affordable Housing Projects [Line Items]
Pre-tax investment losses		$ 33	$ 29	$ 67	$ 58
Impairment losses	[1]	33	29	67	59
Applicable income tax expense
Investments In Affordable Housing Projects [Line Items]
Tax credits and other benefits		$ 52	$ 47	$ 104	$ 93

[1] The Bancorp did not recognize impairment losses resulting from the forfeiture or ineligibility of tax credits or other circumstances during the three and six months ended June 30, 2015 and 2014.