Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statement of Comprehensive Income (Unaudited)
Net income	$ 595	$ 664	$ 1,212	$ 1,355
Other comprehensive income:
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income	327	879	471	1,593
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income	2	12	2	17
Net changes in benefit plan assets and obligations	17	18	34	34
Net changes in unrealized foreign currency translation	48	(35)	89	68
Other comprehensive income before income taxes	394	874	596	1,712
Income tax expense	123	323	185	590
Other comprehensive income, net of taxes	271	551	411	1,122
Comprehensive income	$ 866	$ 1,215	$ 1,623	$ 2,477