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, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total long-term debt $ 2,847 $ 2,122
Less: Current portion of long-term debt 21 21
Long-term debt $ 2,826 $ 2,101
Finance leases    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 4.50% 4.50%
Finance lease liabilities, noncurrent $ 57 $ 60
$750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Maximum borrowing capacity 750  
Debt issuance costs 5 4
Line of Credit | Term loan (due May 2025)    
Debt Instrument [Line Items]    
Long-term debt 1,561 1,568
Line of Credit | $750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Maximum borrowing capacity 750  
Long-term debt $ 734 $ 0
Debt, Weighted Average Interest Rate 2.44%  
Long-term Debt | Term loan (due May 2025)    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 3.23% 4.00%
Senior Notes | 5.375% senior unsecured notes (due April 2026)    
Debt Instrument [Line Items]    
Long-term debt $ 495 $ 494
Debt, Weighted Average Interest Rate 5.38% 5.38%
Debt instrument, interest rate, stated percentage 5.375%  
Term loan and senior unsecured notes    
Debt Instrument [Line Items]    
Debt issuance costs $ 16 $ 18