CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 591	$ (539)	$ 1,028	$ 1,497
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	2	(8)	1	(41)
Net unrealized gains (losses) on securities	141	697	(199)	173
Defined benefit plans			29
Total other comprehensive income (loss), net of tax	143	689	(169)	132
Total comprehensive income	$ 734	$ 150	$ 859	$ 1,629