Parent Company Financial Statements (Condensed Statements of Income - Parent Company Only) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Dividends from subsidiaries:
Consolidated nonbank subsidiaries		$ 2,300	$ 1,900
Total income		4,489	4,193	$ 4,028
Expenses
Interest		691	578	495
Other		186	187	191
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		2,771	2,065	2,365
Applicable income tax benefit		(577)	(505)	(659)
Net income (loss) attributable to Bancorp		2,194	1,564	1,712
Other Comprehensive Income (loss)		14	(138)	(232)
Comprehensive income attributable to Bancorp		2,208	1,426	1,480
Parent Company Only
Dividends from subsidiaries:
Consolidated nonbank subsidiaries	[1]	2,343	1,886	1,040
Interest on loans to subsidiaries		21	18	15
Total income		2,364	1,904	1,055
Expenses
Interest		176	171	178
Other		42	18	22
Total expenses		218	189	200
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		2,146	1,715	855
Applicable income tax benefit		68	63	69
Income (Loss) Before Change in Undistributed Earnings of Subsidiaries		2,214	1,778	924
Change in undistributed earnings (loss)		(20)	(214)	788
Net income (loss) attributable to Bancorp		2,194	1,564	1,712
Other Comprehensive Income (loss)		0	0	0
Comprehensive income attributable to Bancorp		$ 2,194	$ 1,564	$ 1,712

[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 .