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Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 683 $ 67 $ 43
Acquired balance from Direct Energy 0 112 0
Provision for credit losses 11 698 108
Write-offs (593) (224) (101)
Recoveries collected 32 30 17
Ending balance 133 683 $ 67
Provision for credit losses increase due finance hedge risk $ (70) $ 403