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Investments Accounted for by the Equity Method and Variable Interest Entities - Summary of Equity Method Investments and Undistributed Earnings (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments Accounted for by the Equity Method        
Equity investments in affiliates $ 45 $ 45 $ 42  
Impairment losses on investments   7 102 $ 0
Undistributed earnings from equity investment $ 5 $ 5 $ 0  
Gladstone        
Investments Accounted for by the Equity Method        
Economic interest in equity method investments (as a percent) 37.50% 37.50%    
Equity investments in affiliates $ 34 $ 34    
Equity method investment lower than underlying net assets 39 39    
Impairment losses on investments $ 7 $ 7    
Midway-Sunset Cogeneration Company        
Investments Accounted for by the Equity Method        
Economic interest in equity method investments (as a percent) 50.00% 50.00%    
Equity investments in affiliates $ 11 $ 11