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Goodwill and Other Intangibles - Changes in Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]      
Goodwill, Beginning Balance   $ 1,795 $ 579
Goodwill resulted from the acquisition of Direct Energy     1,250
Impairment losses $ (130) (130) (35)
Asset sales   (6)  
Foreign currency translation   (9) 1
Goodwill, Ending Balance   1,650 1,795
Texas      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance   716 289
Goodwill resulted from the acquisition of Direct Energy     427
Impairment losses   0 0
Asset sales   (6)  
Foreign currency translation   0 0
Goodwill, Ending Balance   710 716
East      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance   853 240
Goodwill resulted from the acquisition of Direct Energy     648
Impairment losses   (130) (35)
Asset sales   0  
Foreign currency translation   0 0
Goodwill, Ending Balance   723 853
West/Services/Other      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance   226 50
Goodwill resulted from the acquisition of Direct Energy     175
Impairment losses   0 0
Asset sales   0  
Foreign currency translation   (9) 1
Goodwill, Ending Balance   $ 217 $ 226