CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,534	$ 1,893	$ 2,098
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	27	17	(31)
Net unrealized gains (losses) on securities	407	556	(465)
Net unrealized gains (losses) on derivatives	(1)	(2)	0
Defined benefit plans	(66)	(18)	(23)
Total other comprehensive income (loss), net of tax	367	553	(519)
Total comprehensive income	$ 1,901	$ 2,446	$ 1,579