Condensed Statements of Income - Parent Company Only (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Dividends from subsidiaries:
Bank subsidiaries	$ 2,000,000,000		$ 2,000,000,000		$ 1,400,000,000
Nonbank subsidiaries	2,000,000,000		1,700,000,000
Total interest income	4,107,000,000		4,218,000,000		4,489,000,000
Expenses
Interest	512,000,000		661,000,000		885,000,000
Income (Loss) Before Income Taxes and Change in Undstributed Earnings of Subsidiaries	2,210,000,000		1,831,000,000		940,000,000
Applicable income tax benefit	636,000,000		533,000,000		187,000,000
Net Income (Loss)	1,576,000,000		1,297,000,000		753,000,000
Parent Company [Member]
Dividends from subsidiaries:
Nonbank subsidiaries	1,959,000,000	[1]	1,677,000,000	[1]	1,400,000,000	[1]
Interest on loans to subsidiaries	17,000,000		29,000,000		33,000,000
Total interest income	1,976,000,000		1,706,000,000		1,433,000,000
Expenses
Interest	215,000,000		216,000,000		188,000,000
Other	61,000,000		25,000,000		26,000,000
Total expenses	276,000,000		241,000,000		214,000,000
Income (Loss) Before Income Taxes and Change in Undstributed Earnings of Subsidiaries	1,700,000,000		1,465,000,000		1,219,000,000
Applicable income tax benefit	(96,000,000)		(79,000,000)		(64,000,000)
Income (Loss) Before Change in Undistributed Earnings of Subsidiaries	1,796,000,000		1,544,000,000		1,283,000,000
Change in undistributed earnings (loss)	(220,000,000)		(247,000,000)		(530,000,000)
Net Income (Loss)	$ 1,576,000,000		$ 1,297,000,000		$ 753,000,000

[1] The Bancorp’s indirect banking subsidiary paid dividends, to the Bancorp’s direct nonbank subsidiary holding company of $2.0 billion, $2.0 billion, and $1.4 billion for the years ended 2012, 2011, and 2010, respectively.