Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Convertible preferred stock - savings plan
Convertible preferred stock - savings plan, balance, beginning of year			$ 68	$ 79
Convertible preferred stock - savings plan, redemptions			(5)	(7)
Convertible preferred stock - savings plan, conversion to common stock			(63)
Convertible preferred stock - savings plan, balance, end of period		72		72
Common stock
Common stock, balance, beginning of year			20,162	19,593
Common stock, employee share-based compensation			263	209
Common stock, common shares issued - conversion of preferred stock			93
Common stock, compensation amortization under share-based plans and other changes			89	82
Common stock, balance, end of period	20,607	19,884	20,607	19,884
Retained earnings
Retained earnings, balance, beginning of year			18,847	16,315
Net income	(364)	670	475	1,317
Dividends			(331)	(345)
Premium on preferred stock converted to common stock			(30)
Retained earnings, other			5	(2)
Retained earnings, balance, end of period	18,966	17,285	18,966	17,285
Accumulated other changes in equity from nonowner sources, net of tax
Accumulated other changes in equity from nonowner sources, balance, beginning of year			1,255	1,219
Change in net unrealized gain on investment securities having no credit losses recognized in the consolidated statement of income (loss)	429	422	369	476
Change in net unrealized gain on investment securities having credit losses recognized in the consolidated statement of income (loss)	(6)	21	12	44
Net change in unrealized foreign currency translation and other changes	16	(24)	75	(49)
Accumulated other changes in equity from nonowner sources, balance, end of period	1,711	1,690	1,711	1,690
Treasury stock (at cost)
Treasury stock (at cost), balance, beginning of year			(14,857)	(9,791)
Treasury stock (at cost), treasury shares acquired - share repurchase authorization			(1,337)	(2,800)
Treasury stock (at cost), net shares acquired related to employee share-based compensation plans			(82)	(54)
Treasury stock (at cost), balance, end of period	(16,276)	(12,645)	(16,276)	(12,645)
Total common shareholders' equity	25,008	26,214	25,008	26,214
Total shareholders' equity	25,008	26,286	25,008	26,286
Common shares outstanding
Common shares outstanding, balance, beginning of year			434.6	520.3
Common shares outstanding, treasury shares acquired - share repurchase authorization			(22.8)	(55.0)
Common shares outstanding, common shares issued - conversion of preferred stock			1.5
Common shares outstanding, net shares issued under employee share-based compensation plans			6.2	5.5
Common shares outstanding, balance, end of period	419.5	470.8	419.5	470.8
Summary of changes in equity from nonowner sources
Net income	(364)	670	475	1,317
Other changes in equity from nonowner sources, net of tax			456	471
Total changes in equity from nonowner sources	$ 75	$ 1,089	$ 931	$ 1,788