Income Taxes - Reconciliation of Unrecognized Tax Benefits (Excluding Interest and Penalties) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 2	$ 176	$ 148
Additions for tax positions of the current year	0	0	34
Additions for tax positions of prior years	0	0	0
Reductions for tax positions of prior years	0	(182)	(1)
Settlements with tax authorities	0	(1)	0
Expiration of the statute of limitations	0	0	(2)
Foreign currency translation	0	9	(3)
Balance at end of year	$ 2	$ 2	$ 176