Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 2,015	$ 1,473	$ 3,441	$ 2,998
Other comprehensive income (loss):
Net unrealized securities gains, net of tax	5	(20)	7	(20)
Foreign currency translation adjustments, net of tax	(130)	11	(126)	(244)
Pension and other postretirement benefit gains	6	6	32	29
Other comprehensive income (loss)	(119)	(3)	(87)	(235)
Comprehensive income	$ 1,896	$ 1,470	$ 3,354	$ 2,763