CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 503	$ 507	$ 1,559	$ 1,303
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(3)	16	(18)	46
Net unrealized gains (losses) on securities	(62)	(4)	(454)	60
Net unrealized gains (losses) on derivatives	0	1	0	2
Defined benefit plans	0	0	0	5
Other	0	0	0	(1)
Total other comprehensive income (loss), net of tax	(65)	13	(472)	112
Total comprehensive income	$ 438	$ 520	$ 1,087	$ 1,415