Parent Company Financial Statements (Condensed Statements of Income - Parent Company Only) (Parenthetical) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividend Received From Nonbank Companies And Related Subsidiaries		$ 2,300	$ 1,900
Parent Company Only
Dividend Received From Nonbank Companies And Related Subsidiaries	[1]	$ 2,343	$ 1,886	$ 1,040

[1] (a) The Bancorp’s indirect banking subsidiary paid dividends to the Bancorp’s direct nonbank subsidiary holding company of $2 .3 billion , $1.9 billion and $1.0 billion for the years ended December 31, 2017 , 2016 and 2015 , respectively .