Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 896	$ 806
Other comprehensive income:
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	(376)	(77)
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	9	25
Net changes in benefit plan assets and obligations	28	20
Net changes in unrealized foreign currency translation	(96)	64
Other comprehensive income (loss) before income taxes	(435)	32
Income tax benefit	(125)	(2)
Other comprehensive income (loss), net of taxes	(310)	34
Comprehensive income	$ 586	$ 840