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Long-Term Debt and Finance Lease Obligations - 2025 Notes and 2028 Notes (Details) - USD ($)
12 Months Ended
Jan. 27, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Net cash proceeds received   $ 1,000,000,000 $ 0 $ 0
2025 and 2028 Notes | Senior Notes        
Debt Instrument [Line Items]        
Net cash proceeds received $ 993,000,000      
Debt issuance costs 7,000,000      
2025 Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument face amount $ 600,000,000      
Stated interest rate 5.25%      
Minimum percentage of notes held in order to cause acceleration of notes upon occurrence of events of default 25.00%      
2028 Notes | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument face amount $ 400,000,000      
Stated interest rate 5.75%      
Minimum percentage of notes held in order to cause acceleration of notes upon occurrence of events of default 25.00%