Consolidated Statement of Comprehensive Income (Loss) (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Statement of Comprehensive Income (Loss) (Unaudited)
Net income	$ 925	$ 499	$ 1,821	$ 1,305
Other comprehensive income (loss):
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	(1,790)	216	(2,166)	139
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	(5)	5	4	30
Net changes in benefit plan assets and obligations	26	22	54	42
Net changes in unrealized foreign currency translation	(73)	(86)	(169)	(22)
Other comprehensive income (loss) before income taxes	(1,842)	157	(2,277)	189
Income tax expense (benefit)	(636)	66	(761)	64
Other comprehensive income (loss), net of taxes	(1,206)	91	(1,516)	125
Comprehensive income (loss)	$ (281)	$ 590	$ 305	$ 1,430