Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 664	$ 812	$ 1,355	$ 1,645
Other comprehensive income (loss):
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	879	(1,065)	1,593	(896)
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	12	(5)	17	(10)
Net changes in benefit plan assets and obligations	18	23	34	47
Net changes in unrealized foreign currency translation	(35)	94	68	(180)
Other comprehensive income (loss) before income taxes	874	(953)	1,712	(1,039)
Income tax expense (benefit)	323	(353)	590	(328)
Other comprehensive income (loss), net of taxes	551	(600)	1,122	(711)
Comprehensive income	$ 1,215	$ 212	$ 2,477	$ 934