Segment Information - Reconciliation of Segment Adjusted EBITDA to GAAP Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 140	$ 135
Adjustments to reconcile to GAAP income before income taxes
Depreciation and amortization	(26)	(24)
Interest expense, net	(12)	(27)
IPO and separation-related costs	(3)	(14)
Unrealized losses on derivatives		(4)
Other		(1)
Income before income taxes	99	65
Segment Adjusted EBITDA
Segment Reporting Information [Line Items]
Adjusted EBITDA	149	153
Adjustments to reconcile to GAAP income before income taxes
Depreciation and amortization	(18)	(17)
Corporate / Unallocated Expenses
Segment Reporting Information [Line Items]
Adjusted EBITDA	(9)	(18)
Adjustments to reconcile to GAAP income before income taxes
Depreciation and amortization	$ (8)	$ (7)