CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,031	$ (140)	$ 2,059	$ 1,357
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	(22)	27	(21)	(14)
Net unrealized gains (losses) on securities	(339)	95	(538)	268
Defined benefit plans			29
Total other comprehensive income (loss), net of tax	(361)	122	(530)	254
Total comprehensive income (loss)	$ 670	$ (18)	$ 1,529	$ 1,611