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Long-Term Debt - Summary of Carrying Value of Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total debt $ 2,516 $ 2,703
Less: debt issuance costs (12) (22)
Less: unamortized discounts (19) (33)
Less: Current portion of long-term debt (34) 0
Total long-term debt 2,451 2,648
Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt 235 0
Senior Notes    
Debt Instrument [Line Items]    
Total debt 300 1,050
Term Loan | Term Loan B    
Debt Instrument [Line Items]    
Total debt 1,293 1,653
Term Loan | Term Loan A    
Debt Instrument [Line Items]    
Total debt $ 688 $ 0