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Long-Term Debt - CEI Senior Notes due 2027 (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 17, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 06, 2020
Long-term debt          
Loss on extinguishment of debt   $ 89 $ 200 $ 85  
CEI Senior Notes due 2027 | Senior Notes          
Long-term debt          
Long-term debt, gross         $ 1,800
Interest rate (as a percent)   8.125%     8.125%
Repayments of debt $ 1,100        
Loss on extinguishment of debt $ 31