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Debt - Term Loan Facility Narrative (Details)	1 Months Ended	12 Months Ended
Debt - Term Loan Facility Narrative (Details)	Oct. 31, 2015 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 28, 2018 USD ($)	Mar. 31, 2017 USD ($)
Debt Instrument [Line Items]
Debt extinguishment loss		$ 5,000,000	$ 27,000,000	$ 36,000,000
Secured Debt \| Amendment No. 2 to Credit Agreement
Debt Instrument [Line Items]
Long-term debt						$ 1,494,000,000
Secured Debt \| Amendment No. 3 to Credit Agreement
Debt Instrument [Line Items]
Long-term debt					$ 1,503,000,000
Secured Debt \| Amendment No. 1 to Credit Agreement
Debt Instrument [Line Items]
Long-term debt						$ 1,482,000,000
Term loan facility
Debt Instrument [Line Items]
Secured revolving loan credit agreement amount	$ 1,600,000,000
Original issue discount	$ 32,000,000
Long-term debt		$ 1,503,000,000	1,503,000,000
Prepayment as percentage of excess cash flow	50.00%
Required leverage ratio (less than or equal to)		2.50
Term loan facility \| Secured Debt
Debt Instrument [Line Items]
Annual effective interest rate		3.80%
Term loan facility \| Secured Debt \| Amendment No. 2 to Credit Agreement
Debt Instrument [Line Items]
Debt extinguishment loss			$ 10,000,000
Term loan facility \| Secured Debt \| Amendment No. 1 to Credit Agreement
Debt Instrument [Line Items]
Debt extinguishment loss				$ 8,000,000
Incremental loan facility
Debt Instrument [Line Items]
Long-term debt		$ 500,000,000
Incremental loan facility \| Secured Debt
Debt Instrument [Line Items]
Annual effective interest rate		4.24%
Term Loan Facility, Scenario 1
Debt Instrument [Line Items]
Prepayment as percentage of excess cash flow	25.00%
Term Loan Facility, Scenario 1 \| Minimum
Debt Instrument [Line Items]
Required leverage ratio (less than or equal to)	2.50
Term Loan Facility, Scenario 1 \| Maximum
Debt Instrument [Line Items]
Required leverage ratio (less than or equal to)	3.00
Term Loan Facility, Scenario 2
Debt Instrument [Line Items]
Prepayment as percentage of excess cash flow	0.00%
Term Loan Facility, Scenario 2 \| Maximum
Debt Instrument [Line Items]
Required leverage ratio (less than or equal to)	2.50