CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 403	$ 364
Other comprehensive income, net of tax:
Foreign currency translation adjustment	7	(11)
Net unrealized gains on securities	7	193
Net unrealized gains on derivatives	1	1
Defined benefit plans	5	0
Other	(1)	0
Total other comprehensive income, net of tax	19	183
Total comprehensive income	$ 422	$ 547