Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 919	$ 864	$ 2,654	$ 2,685
Other comprehensive income (loss):
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	(154)	(204)	901	(2,370)
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	1	(2)	4	2
Net changes in benefit plan assets and obligations	15	24	45	78
Net changes in unrealized foreign currency translation	(203)	112	(149)	(57)
Other comprehensive income (loss) before income taxes	(341)	(70)	801	(2,347)
Income tax expense (benefit)	(79)	(55)	311	(816)
Other comprehensive income (loss), net of taxes	(262)	(15)	490	(1,531)
Comprehensive income	$ 657	$ 849	$ 3,144	$ 1,154