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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
Dec. 31, 2023
Dec. 31, 2022
Investments Accounted for by the Equity Method    
Equity investments in affiliates $ 42 $ 133
Undistributed earnings from equity investment $ 0 $ 42
Gladstone    
Investments Accounted for by the Equity Method    
Economic interest in equity method investments (as a percent) 37.50%  
Equity investments in affiliates $ 34  
Midway-Sunset Cogeneration Company    
Investments Accounted for by the Equity Method    
Economic interest in equity method investments (as a percent) 50.00%  
Equity investments in affiliates $ 8