Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 864	$ 333	$ 2,169	$ 808
Other comprehensive income:
Change in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	470	687	609	1,226
Change in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	41	(9)	71	9
Net changes in benefit plan assets and obligations	22	20	64	57
Net changes in unrealized foreign currency translation and other changes	65	(180)	43	(94)
Other comprehensive income before income taxes	598	518	787	1,198
Income tax expense, other comprehensive income	192	197	256	421
Other comprehensive income, net of taxes	406	321	531	777
Comprehensive income	$ 1,270	$ 654	$ 2,700	$ 1,585