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Long-Term Debt - Summary of Carrying Value of Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2018
May 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Total debt $ 2,014   $ 2,249
Less: debt issuance costs (6)   (7)
Less: unamortized discounts (9)   (15)
Less: Current portion of long-term debt (85)   (51)
Total long-term debt 1,914   2,176
Revolving Credit Facility      
Debt Instrument [Line Items]      
Total debt 433   275
Term Loan | Term Loan B      
Debt Instrument [Line Items]      
Total debt 810   1,160
Term Loan | Term Loan A      
Debt Instrument [Line Items]      
Total debt 653 $ 670 679
Secured Debt | Receivables Financing Facility      
Debt Instrument [Line Items]      
Total debt $ 118   $ 135