Condensed Statements of Income - Parent Company Only (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends from subsidiaries:
Consolidated nonbank subsidiaries		$ 1,000	$ 1,100
Total income		4,028	4,030	$ 3,973
Expenses
Interest		495	451	412
Other		191	181	193
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		2,365	2,028	2,598
Applicable income tax benefit		(659)	(545)	(772)
Net income attributable to Bancorp		1,712	1,481	1,836
Other Comprehensive Income (loss)		(232)	347	(293)
Comprehensive income attributable to Bancorp		1,480	1,828	1,543
Parent Company Only
Dividends from subsidiaries:
Consolidated nonbank subsidiaries	[1]	1,040	1,094	859
Interest on loans to subsidiaries		15	14	14
Total income		1,055	1,108	873
Expenses
Interest		178	163	178
Other		22	17	36
Total expenses		200	180	214
Income Before Income Taxes and Change in Undistributed Earnings of Subsidiaries		855	928	659
Applicable income tax benefit		69	62	74
Income (Loss) Before Change in Undistributed Earnings of Subsidiaries		924	990	733
Change in undistributed earnings (loss)		788	491	1,103
Net income attributable to Bancorp		1,712	1,481	1,836
Comprehensive income attributable to Bancorp		$ 1,712	$ 1,481	$ 1,836

[1] The Bancorp’s indirect banking subsidiary paid dividends to the Bancorp’s direct nonbank subsidiary holding company of $1.0 billion, $1.1 billion and $859 million for the years ended December 31, 2015, 2014 and 2013, respectively.