Income Taxes - Deferred Income Tax Valuation Allowance Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets Valuation Allowance [Roll Forward]
Beginning balance of deferred income tax valuation allowance	$ 95	$ 119	$ 119
Charges against goodwill	0	2	1
Increases/(Decreases)	4	(26)	(1)
Ending balance of deferred income tax valuation allowance	$ 99	$ 95	$ 119