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Debt - Summary of Long-Term Debt and Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total long-term debt $ 2,546 $ 2,548
Current portion of long-term debt 6 0
deferred financing costs, net 27 25
Long-term debt 2,513 2,523
Senior Secured Credit Facility Term Loan, Variable, Due 2022    
Debt Instrument [Line Items]    
Total long-term debt 0 1,148
Senior Notes, Fixed 5.0%, Due 2024    
Debt Instrument [Line Items]    
Total long-term debt 1,000 1,000
Senior Secured Credit Facility Term Loan, Variable, Due 2026    
Debt Instrument [Line Items]    
Total long-term debt 646 0
Senior Notes, Fixed 4.75%, Due 2027    
Debt Instrument [Line Items]    
Total long-term debt 400 400
Senior Notes, Fixed 5.875%, Due 2029    
Debt Instrument [Line Items]    
Total long-term debt 500 $ 0
deferred financing costs, net $ 6