Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 1,052	$ 896
Other comprehensive income (loss):
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	537	(376)
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	2	9
Net changes in benefit plan assets and obligations	15	28
Net changes in unrealized foreign currency translation	(43)	(96)
Other comprehensive income (loss) before income taxes	511	(435)
Income tax expense (benefit)	194	(125)
Other comprehensive income (loss), net of taxes	317	(310)
Comprehensive income	$ 1,369	$ 586