Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 716	$ 928	$ 2,071	$ 2,573
Other comprehensive income (loss):
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	(455)	67	1,138	(829)
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	6	(3)	23	(13)
Net changes in benefit plan assets and obligations	16	24	50	71
Net changes in unrealized foreign currency translation	(31)	(227)	37	(407)
Other comprehensive income (loss) before income taxes	(464)	(139)	1,248	(1,178)
Income tax expense (benefit)	(159)	(2)	431	(330)
Other comprehensive income (loss), net of taxes	(305)	(137)	817	(848)
Comprehensive income	$ 411	$ 791	$ 2,888	$ 1,725