Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 241	$ 157	$ 122
State	122	86	148
Non-U.S.	310	357	374
Total current expense	673	600	644
Deferred:
Federal	(168)	(6)	(128)
State	5	33	(22)
Non-U.S.	(31)	(157)	14
Total deferred expense (benefit)	(194)	(130)	(136)
Total income tax expense (benefit)	$ 479	$ 470	$ 508