Consolidated Statements of Changes in Stockholders' Equity and Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	Total	Preferred stock	Common stock	Capital surplus	Retained earnings	Accumulated other comprehensive income/(loss)	Shares held in RSU Trust, at cost	Treasury stock, at cost
Beginning balance at Dec. 31, 2010		$ (7,800)	$ (4,105)	$ (97,415)	$ (73,998)	$ (1,001)	$ (53)	$ (8,160)
Shares issued and commitments to issue common stock for employee stock-based compensation awards, and related tax effects				(2,755)
Stockholders' equity	(180,598)	(7,800)	(4,105)	(94,660)	(78,342)	(712)	(53)	(4,968)
Net income	5,555				5,555
Dividends declared:
Preferred stock					(157)
Common stock ($.30, and $0.25 per share)					(1,054)
Other comprehensive (loss)/income						(289)
Purchase of treasury stock								(95)
Reissuance from treasury stock								3,287
Comprehensive income	5,266
Ending balance at Mar. 31, 2011	(180,598)	(7,800)	(4,105)	(94,660)	(78,342)	(712)	(53)	(4,968)
Beginning balance at Dec. 31, 2011		(7,800)	(4,105)	(95,602)	(88,315)	(944)	(38)	(13,155)
Shares issued and commitments to issue common stock for employee stock-based compensation awards, and related tax effects				(1,532)
Stockholders' equity	(189,728)	(7,800)	(4,105)	(94,070)	(92,347)	(2,645)	(38)	(11,201)
Net income	5,383				5,383
Dividends declared:
Preferred stock					(157)
Common stock ($.30, and $0.25 per share)					(1,194)
Other comprehensive (loss)/income						1,701
Purchase of treasury stock								(216)
Reissuance from treasury stock								2,170
Comprehensive income	7,084
Ending balance at Mar. 31, 2012	$ (189,728)	$ (7,800)	$ (4,105)	$ (94,070)	$ (92,347)	$ (2,645)	$ (38)	$ (11,201)