CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 1,893	$ 2,098	$ 1,480
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	17	(31)	(8)
Net unrealized gains (losses) on securities	556	(465)	7
Net unrealized gains (losses) on derivatives	(2)	0	3
Defined benefit plans	(18)	(23)	28
Other	0	0	(1)
Total other comprehensive income (loss), net of tax	553	(519)	29
Total comprehensive income	$ 2,446	$ 1,579	$ 1,509