Income Taxes - Schedule of Components of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S.	$ 49	$ (18)	$ 55
Foreign	458	443	445
Total current	507	425	500
Deferred:
U.S.	(6)	(12)	(60)
Foreign	149	63	(38)
Total deferred	143	51	(98)
Provision for income taxes	$ 650	$ 476	$ 402