Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 293	$ 716	$ 1,505	$ 2,071
Other comprehensive income (loss):
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	(42)	(455)	429	1,138
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	2	6	4	23
Net changes in benefit plan assets and obligations	(9)	16	25	50
Net changes in unrealized foreign currency translation	113	(31)	202	37
Other comprehensive income (loss) before income taxes	64	(464)	660	1,248
Income tax expense (benefit)	5	(159)	190	431
Other comprehensive income (loss), net of taxes	59	(305)	470	817
Comprehensive income	$ 352	$ 411	$ 1,975	$ 2,888