Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Borrowing Arrangements (Schedule of Company's Indebtedness) (Details)

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Long-Term Debt and Borrowing Arrangements (Schedule of Company's Indebtedness) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Capital leases $ 67 $ 0
Total long-term debt 2,145 184
Less: Current portion of long-term debt 16 0
Long-term debt 2,129 0
Affiliated Entity    
Debt Instrument [Line Items]    
Less: Current portion of long-term debt   103
Long-term debt   81
$750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Debt issuance costs 6  
Line of Credit | Term loan (due May 2025)    
Debt Instrument [Line Items]    
Long-term debt 1,585 0
Line of Credit | $750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Long-term debt 0 0
Senior Notes | 5.375% senior unsecured notes (due April 2026)    
Debt Instrument [Line Items]    
Long-term debt 493 0
Debt due to former Parent    
Debt Instrument [Line Items]    
Long-term debt 0 $ 184
Term loan and senior unsecured notes    
Debt Instrument [Line Items]    
Debt issuance costs $ 22