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Goodwill and Identifiable Intangible Assets and Liabilities - Schedule of Goodwill (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Goodwill $ 2,583 $ 2,583
Texas Generation Reporting Unit    
Goodwill [Line Items]    
Goodwill 122 122
Retail Reporting Unit    
Goodwill [Line Items]    
Goodwill $ 2,461 $ 2,461