Reconciliation of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders (Detail) (USD $) In Millions, except Share data	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Net income/(loss)	$ 178		$ 12		$ 358		$ (149)
Series A preferred dividends	(2)		(2)		(4)		(4)
Dividends and accretion of discount on preferred stock issued to the U.S. Treasury			(66)		(66)		(132)
Accelerated accretion for repurchase of preferred stock issued to the U.S. Treasury					(74)
Dividends and undistributed earnings allocated to unvested shares	(2)				(2)
Net income/(loss) available to common shareholders	$ 174		$ (56)		$ 212		$ (285)
Average basic common shares	531,792,000		495,351,000		515,819,000		495,112,000
Effect of dilutive securities:
Stock options	1,000,000		1,000,000		2,000,000		1,000,000
Restricted stock	2,000,000		2,000,000		2,000,000		2,000,000
Average diluted common shares	535,416,000		498,499,000		519,548,000		498,369,000
Net income/(loss) per average common share - diluted	$ 0.33	[1]	$ (0.11)	[1]	$ 0.41	[1]	$ (0.58)	[1]
Net income/(loss) per average common share - basic	$ 0.33		$ (0.11)		$ 0.41		$ (0.58)

[1] For earnings per share calculation purposes, the impact of dilutive securities are excluded from the diluted share count during periods that the Company has recognized a net loss available to common shareholders because the impact would be anti-dilutive.