Reconciliation of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Net Income (Loss) Attributable to Parent	$ 576	$ 189	$ 1,380		$ 918
Dividends, Preferred Stock, Cash	(9)	(9)	(28)	[1]	(28)	[1]
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	4	1	9		6
Net Income (Loss) Available to Common Stockholders, Basic	$ 563	$ 179	$ 1,343		$ 884
Average basic common shares	527,402	533,829	529,429		534,887
Stock options	2,000	1,000	2,000		1,000
Restricted stock	4,000	4,000	4,000		3,000
Average diluted common shares	533,230	538,850	535,222		539,488
Net income/(loss) per average common share - diluted	$ 1.06	$ 0.33	$ 2.51		$ 1.64
Earnings Per Share, Basic	$ 1.07	$ 0.33	$ 2.54		$ 1.65

[1] For the nine months ended September 30, 2014, dividends were $3,044 per share for both Perpetual Preferred Stock Series A and B and $4,406 per share for Perpetual Preferred Stock Series E.For the nine months ended September 30, 2013, dividends were $3,044 per share for both Perpetual Preferred Stock Series A and B and $4,325 per share for Perpetual Preferred Stock Series E.