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, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total long-term debt $ 2,088 $ 2,597
Less: Current portion of long-term debt 21 21
Long-term debt $ 2,067 $ 2,576
Finance leases    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 4.50% 4.50%
Finance lease liabilities, noncurrent $ 52 $ 55
$750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Debt issuance costs 3 4
Line of Credit | $750 million revolving credit facility (due May 2023)    
Debt Instrument [Line Items]    
Long-term debt 0 0
Long-term Debt | Term loan (due May 2025)    
Debt Instrument [Line Items]    
Long-term debt $ 1,544 $ 1,554
Debt, Weighted Average Interest Rate 3.10% 3.18%
Senior Notes | 5.375% senior unsecured notes (due April 2026)    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 496
Debt, Weighted Average Interest Rate 5.38%
Senior Notes | Senior Unsecured Notes due August 2028    
Debt Instrument [Line Items]    
Long-term debt $ 492 $ 492
Debt, Weighted Average Interest Rate 4.38% 4.38%
Term loan and senior unsecured notes    
Debt Instrument [Line Items]    
Debt issuance costs $ 15 $ 22