Income Taxes - Comparative Analysis of Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current
U.S. federal	$ (11)	$ 8	$ 8
State and local	1	1	1
Foreign	168	161	119
Total current income tax expenses	158	170	128
Deferred
U.S. federal	336	(101)	(35)
State and local	35	(13)	(5)
Foreign	(70)	(37)	(25)
Total deferred income tax expenses	301	(151)	(65)
Income tax expense	$ 459	$ 19	$ 63