Parent Company Financial Statements (Condensed Statements of Income - Parent Company Only) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Dividends from subsidiaries:
Consolidated nonbank subsidiaries		$ 1,900	$ 1,000
Total income		4,193	4,028	$ 4,030
Expenses
Interest		578	495	451
Other		187	191	181
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		2,065	2,365	2,028
Applicable income tax benefit		(505)	(659)	(545)
Net income (loss) attributable to Bancorp		1,564	1,712	1,481
Other Comprehensive Income (loss)		(138)	(232)	347
Comprehensive income attributable to Bancorp		1,426	1,480	1,828
Parent Company Only
Dividends from subsidiaries:
Consolidated nonbank subsidiaries	[1]	1,886	1,040	1,094
Interest on loans to subsidiaries		18	15	14
Total income		1,904	1,055	1,108
Expenses
Interest		171	178	163
Other		18	22	17
Total expenses		189	200	180
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		1,715	855	928
Applicable income tax benefit		63	69	62
Income (Loss) Before Change in Undistributed Earnings of Subsidiaries		1,778	924	990
Change in undistributed earnings (loss)		(214)	788	491
Net income (loss) attributable to Bancorp		1,564	1,712	1,481
Other Comprehensive Income (loss)		0	0	0
Comprehensive income attributable to Bancorp		$ 1,564	$ 1,712	$ 1,481

[1] (a) The Bancorp’s indirect banking subsidiary paid dividends to the Bancorp’s direct nonbank subsidiary holding company of $1.9 billion , $1.0 billion and $1.1 billion for the years ended December 31, 2016 , 2015 and 2014 , respectively .