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
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Finance lease liabilities, noncurrent $ 61 $ 65
Total long-term debt 2,127 2,141
Less: Current portion of long-term debt 21 21
Long-term debt 2,106 2,120
$750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Maximum borrowing capacity 750  
Debt issuance costs 4 5
Line of Credit | Term loan (due May 2025)    
Debt Instrument [Line Items]    
Long-term debt 1,572 1,582
Line of Credit | $750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Maximum borrowing capacity 750  
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 $ 494 494
Term loan and senior unsecured notes    
Debt Instrument [Line Items]    
Debt issuance costs $ 18 $ 21