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Long-Term Debt - CEI Senior Notes due 2027 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 06, 2020
Long-term debt        
Interest rate (as a percent) 4.30%      
Loss on extinguishment of debt $ 236 $ 197 $ 8  
CEI Senior Secured Notes        
Long-term debt        
Interest rate (as a percent) 8.125%      
CEI Senior Secured Notes | Senior Notes        
Long-term debt        
Long-term debt, gross       $ 1,800
Repayments of debt $ 100      
Loss on extinguishment of debt $ 14