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Debt - Debt Issuances (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Finance lease obligations $ 18,000,000 $ 20,000,000
Other loans 4,000,000 4,000,000
Principal debt balance 1,444,000,000 1,528,000,000
Debt issuance costs and unamortized discounts (15,000,000) (18,000,000)
Less: current maturities (89,000,000) (90,000,000)
Total Long-term Debt 1,340,000,000 1,420,000,000
Line of Credit Facility [Line Items]    
Letters of Credit Outstanding, Amount 7,000,000  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 750,000,000  
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 750,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 743,000,000  
Term loan A due December 2022    
Debt Instrument [Line Items]    
Long-term debt, gross 610,000,000 654,000,000
Term loan B due December 2023    
Debt Instrument [Line Items]    
Long-term debt, gross 812,000,000 816,000,000
Senior notes due 2024    
Debt Instrument [Line Items]    
Long-term debt, gross $ 0 $ 34,000,000