Parent Company Financial Statements (Condensed Statements of Income - Parent Company Only) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2016
Dividends from subsidiaries:
Consolidated nonbank subsidiaries		$ 1,900		$ 2,300
Total income		5,183		4,489	$ 4,193
Expenses
Interest		1,043		691	578
Other		219		186	187
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		2,765		2,979	2,208
Applicable income tax benefit		(572)		(799)	(665)
Net income (loss) attributable to Bancorp		2,193		2,180	1,547
Other Comprehensive Income (loss)		(183)	$ (183)	14	(138)	$ (138)
Comprehensive income attributable to Bancorp		2,010		2,194	1,409
Parent Company Only
Dividends from subsidiaries:
Consolidated nonbank subsidiaries	[1]	1,890		2,343	1,886
Interest on loans to subsidiaries		24		21	18
Total income		1,914		2,364	1,904
Expenses
Interest		211		176	171
Other		34		42	18
Total expenses		245		218	189
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		1,669		2,146	1,715
Applicable income tax benefit		50		68	63
Income (Loss) Before Change in Undistributed Earnings of Subsidiaries		1,719		2,214	1,778
Change in undistributed earnings (loss)		474		(34)	(231)
Net income (loss) attributable to Bancorp		2,193		2,180	1,547
Other Comprehensive Income (loss)		0		0	0
Comprehensive income attributable to Bancorp		$ 2,193		$ 2,180	$ 1,547

[1] (a) The Bancorp’s indirect banking subsidiary paid dividends to the Bancorp’s direct nonbank subsidiary holding company of $1.9 billion , $2.3 billion and $1.9 billion for the years ended December 31, 2018 , 2017 and 2016 , respectively .