Reconciliation of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Net Income (Loss) Attributable to Parent	$ 1,344		$ 1,958	$ 647
Dividends, Preferred Stock, Cash	(37)	[1]	(12)	(7)
United States Treasury Preferred Dividends	0		0	(66)
Accelerated Accretion On US Treasury Preferred Stock	0		0	74
Undistributed Earnings Allocated to Participating Securities	(10)		(15)	(5)
Net Income (Loss) Available to Common Stockholders, Basic	$ 1,297		$ 1,931	$ 495
Average basic common shares	534,283,000		534,149,000	523,995,000
Stock options	1,000,000		1,000,000	2,000,000
Restricted stock	4,000,000		3,000,000	2,000,000
Average diluted common shares	539,093,000		538,061,000	527,618,000
Net income/(loss) per average common share - diluted	$ 2.41		$ 3.59	$ 0.94
Earnings Per Share, Basic	$ 2.43		$ 3.62	$ 0.94

[1] Dividends were $4,056 per share for Perpetual Preferred Stock Series A and B and $5,793 per share for Perpetual Preferred Stock Series E for the year ended December 31, 2013.