Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,178	$ 129	$ 1,642	$ 197
Other comprehensive income (loss):
Foreign currency translation adjustment	63	73	(157)	(4)
Comprehensive income	1,241	202	1,485	193
Less: Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interests in subsidiaries	36	25	62	77
Comprehensive income attributable to common stockholders	$ 1,205	$ 177	$ 1,423	$ 116