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 ($)
Sep. 30, 2018
May 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Capital leases $ 67,000,000     $ 0
Total long-term debt 2,145,000,000      
Less: Current portion of long-term debt 21,000,000     0
Long-term debt 2,124,000,000     0
Affiliated Entity        
Debt Instrument [Line Items]        
Total long-term debt       184,000,000
Less: Current portion of long-term debt       103,000,000
Long-term debt       81,000,000
$750 million revolving credit facility (due May 2023)        
Debt Instrument [Line Items]        
Maximum borrowing capacity 750,000,000 $ 750,000,000    
Debt issuance costs 5,000,000      
Line of Credit | Term loan (due May 2025)        
Debt Instrument [Line Items]        
Long-term debt 1,585,000,000     0
Line of Credit | $750 million revolving credit facility (due May 2023)        
Debt Instrument [Line Items]        
Maximum borrowing capacity 750,000,000      
Long-term debt $ 0     0
Long-term Debt | 5.375% senior unsecured notes (due April 2026)        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 5.375%   5.375%  
Senior Notes | 5.375% senior unsecured notes (due April 2026)        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 5.375%      
Long-term debt $ 493,000,000     0
Debt due to former Parent        
Debt Instrument [Line Items]        
Long-term debt 0     $ 184,000,000
Term loan and senior unsecured notes        
Debt Instrument [Line Items]        
Debt issuance costs $ 21,000,000