Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,426	$ 1,525
Other comprehensive income (loss):
Net unrealized securities gains, net of tax	2	0
Foreign currency translation adjustments, net of tax	4	(255)
Pension and other postretirement benefit gains	26	23
Other comprehensive income (loss)	32	(232)
Comprehensive income	$ 1,458	$ 1,293