Income Taxes - Schedule of Changes in Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation Of Changes In Valuation Allowance [Roll Forward]
Balance at beginning of year	$ 2,307	$ 2,121	$ 2,357
Increase to allowance	113	136	19
Release of allowance	(94)	(50)	(211)
Acquisitions and divestitures	0	0	(2)
Tax apportionment, tax rate and tax law changes	63	(23)	(13)
Foreign currency translation	(110)	123	(29)
Balance at end of year	$ 2,279	$ 2,307	$ 2,121