VIE (Investments in Qualified Affordable Housing Tax Credits) (Detail) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other noninterest expense
Schedule of Equity Method Investments
Pre-tax investment and impairment losses	[1]	$ 207	$ 144	$ 126
Applicable income tax expense
Schedule of Equity Method Investments
Tax credits and other benefits		$ (246)	$ (220)	$ (205)

[1] (a) The Bancorp recognized $68 of impairment losses primarily due to the change in the federal statutory corporate tax rate during the year ended December 31, 2017 and did not recognize impairment losses resulting from the forfeiture or ineligibility of tax credits or othe r circumstances during the years ended December 31, 2017 , 2016 and 2015 .