Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,340	$ 2,015	$ 2,577	$ 3,441
Other comprehensive income (loss):
Net unrealized securities gains, net of tax	0	5	6	7
Foreign currency translation adjustments, net of tax	33	(130)	349	(126)
Pension and other postretirement benefits	9	6	1	32
Other comprehensive income (loss)	42	(119)	356	(87)
Comprehensive income	$ 1,382	$ 1,896	$ 2,933	$ 3,354