Consolidated Statements of Changes in Stockholders' Equity and Comprehensive Income (Unaudited) (USD $) In Millions	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, 2009		$ 8,152	$ 4,105	$ 97,982	$ 62,481	$ (91)	$ (68)	$ (7,196)
Redemption of preferred stock	(352)	(352)
Shares issued and commitments to issue common stock for employee stock-based compensation awards, and related tax effects				229
Other				(1,273)
Cumulative effect of changes in accounting principles	173,830	7,800	4,105	96,938	69,531	3,096	(68)	(7,572)
Cumulative effect of changes in accounting principles (Adjustments for New Accounting Pronouncement [Member])					(4,376)	(144)
Net income	12,539				12,539
Dividends declared:
Preferred stock					485
Common stock ($0.75 and $0.15 per share)					628
Purchase of treasury stock								2,312
Reissuance from treasury stock								1,936
Other comprehensive income/(loss)	3,331					3,331
Other comprehensive income/(loss) (Adjustments for New Accounting Pronouncement [Member])						(144)
Other comprehensive income/(loss) (Cumulative-Effect Adjustment, Consolidation of Variable Interest Entity [Member])						129
Other comprehensive income/(loss) (Accounting Standards Update 2010-11 [Member])						15
Comprehensive income	15,870
Ending balance (Adjustments for New Accounting Pronouncement [Member])					(4,376)	(144)
Ending balance at Sep. 30, 2010	173,830	7,800	4,105	96,938	69,531	3,096	(68)	(7,572)
Beginning balance (Accounting Standards Update 2010-11 [Member])
Cumulative effect of changes in accounting principles	173,830		4,105				(68)
Cumulative effect of changes in accounting principles (Adjustments for New Accounting Pronouncement [Member])					(4,376)
Net income	4,418
Ending balance (Adjustments for New Accounting Pronouncement [Member])					(4,376)
Ending balance at Sep. 30, 2010	173,830		4,105				(68)
Beginning balance at Dec. 31, 2010		7,800	4,105	97,415	73,998	1,001	(53)	(8,160)
Redemption of preferred stock	0
Shares issued and commitments to issue common stock for employee stock-based compensation awards, and related tax effects				(2,212)
Other				(125)
Cumulative effect of changes in accounting principles	182,287	7,800	4,105	95,078	85,726	1,964	(53)	(12,333)
Cumulative effect of changes in accounting principles (Adjustments for New Accounting Pronouncement [Member])					0	0
Net income	15,248
Dividends declared:
Preferred stock					(472)
Common stock ($0.75 and $0.15 per share)					(3,048)
Purchase of treasury stock								(7,877)
Reissuance from treasury stock								3,704
Other comprehensive income/(loss)	963					963
Comprehensive income	16,211
Ending balance (Adjustments for New Accounting Pronouncement [Member])					0	0
Ending balance at Sep. 30, 2011	182,287	7,800	4,105	95,078	85,726	1,964	(53)	(12,333)
Beginning balance (Accounting Standards Update 2010-11 [Member])
Cumulative effect of changes in accounting principles	182,287	7,800	4,105		85,726		(53)
Cumulative effect of changes in accounting principles (Adjustments for New Accounting Pronouncement [Member])					0	0
Net income	4,262				15,248
Ending balance (Adjustments for New Accounting Pronouncement [Member])					0	0
Ending balance at Sep. 30, 2011	$ 182,287	$ 7,800	$ 4,105		$ 85,726		$ (53)