CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 437	$ 2,036
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(1)	(33)
Net unrealized gains (losses) on securities	(340)	(524)
Defined benefit plans	29
Total other comprehensive income (loss), net of tax	(312)	(557)
Total comprehensive income	$ 125	$ 1,479