Condensed Statements of Income - Parent Company Only (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Dividends from subsidiaries:
Bank subsidiaries	$ 2,000		$ 1,400
Nonbank subsidiaries	1,700		1,400
Total income	4,218		4,489		4,668
Expenses
Interest	661		885		1,314
Income (Loss) Before Income Taxes and Change in Undstributed Earnings of Subsidiaries	1,831		940		767
Applicable income tax benefit	533		187		30
Net Income (Loss)	1,297		753		737
Parent Company [Member]
Dividends from subsidiaries:
Bank subsidiaries	0	[1]	0	[1]	0	[1]
Nonbank subsidiaries	1,677		1,400
Interest on loans to subsidiaries	29		33		39
Total income	1,706		1,433		39
Expenses
Interest	216		188		222
Other	25		26		20
Total expenses	241		214		242
Income (Loss) Before Income Taxes and Change in Undstributed Earnings of Subsidiaries	1,465		1,219		(203)
Applicable income tax benefit	(79)		(64)		(71)
Income (Loss) Before Change in Undistributed Earnings of Subsidiaries	1,544		1,283		(132)
Change in undistributed earnings (loss)	(247)		(530)		869
Net Income (Loss)	$ 1,297		$ 753		$ 737

[1] ( a) The Bancorp’s indirect banking subsidiary paid dividends, to the Bancorp’s direct non-bank subsidiary holding company of $2.0 billion, $1.4 billion, and $0 for the years ended 2011, 2010, 2009, respectively