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Long-Term Debt and Revolving Credit Arrangements - Components of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Jun. 13, 2018
Debt Instrument [Line Items]
Total debt	$ 5,784	$ 5,791
Less: unamortized discount and issuance costs	(54)	(57)
Less: current portion of long-term debt	(27)	(27)
Total long-term debt	5,703	5,707
Secured Loans \| 2016 Senior Secured Term Loan
Debt Instrument [Line Items]
Total debt	$ 1,110	1,113
Effective Interest Rate	6.10%		6.10%
Secured Loans \| 2018 Senior Secured Term Loan
Debt Instrument [Line Items]
Total debt	$ 1,474	1,478
Effective Interest Rate	6.20%
Senior Note \| 2023 Senior Note
Debt Instrument [Line Items]
Total debt	$ 500	500
Effective Interest Rate	7.70%
Senior Note \| 2026 Senior Note
Debt Instrument [Line Items]
Total debt	$ 1,500	1,500
Effective Interest Rate	8.10%
Senior Note \| 2027 Senior Note
Debt Instrument [Line Items]
Total debt	$ 1,200	$ 1,200
Effective Interest Rate	7.70%