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 ($)
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Finance lease liabilities, noncurrent $ 63,000,000 $ 65,000,000
Total long-term debt 2,131,000,000 2,141,000,000
Less: Current portion of long-term debt 21,000,000 21,000,000
Long-term debt 2,110,000,000 2,120,000,000
$750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Maximum borrowing capacity 750,000,000  
Debt issuance costs 5,000,000  
Line of Credit | Term loan (due May 2025)    
Debt Instrument [Line Items]    
Long-term debt 1,574,000,000 1,582,000,000
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
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 $ 494,000,000 494,000,000
Term loan and senior unsecured notes    
Debt Instrument [Line Items]    
Debt issuance costs $ 19,000,000 $ 21,000,000