Segment Information - Reconciliation of Segment Adjusted EBITDA to GAAP Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 148	$ 193	$ 288	$ 328
Adjustments to reconcile to GAAP income before income taxes
Depreciation and amortization	(27)	(24)	(53)	(48)
Interest expense, net	(12)	(17)	(24)	(44)
IPO and separation-related costs	(4)	(7)	(7)	(21)
Unrealized gains (losses) on derivatives		3		(1)
Other				(1)
Income before income taxes	105	148	204	213
Segment Adjusted EBITDA
Segment Reporting Information [Line Items]
Adjusted EBITDA	170	200	318	353
Adjustments to reconcile to GAAP income before income taxes
Depreciation and amortization	(19)	(16)	(37)	(33)
Corporate / Unallocated Expenses
Segment Reporting Information [Line Items]
Adjusted EBITDA	(22)	(7)	(30)	(25)
Adjustments to reconcile to GAAP income before income taxes
Depreciation and amortization	$ (8)	$ (8)	$ (16)	$ (15)