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Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 627 $ 761 $ 683 $ 67
Acquired balance from Direct Energy 0 0 0 112
Provision for credit losses 52 64 103 715
Write-offs (50) (41) (171) (124)
Recoveries collected 9 8 23 22
Ending balance $ 638 $ 792 638 $ 792
Decrease in provision for credit losses due finance hedge risk     403  
Decrease in provision for credit losses due to counterparty credit risk     152  
Decrease in provision for credit losses due to shortfall payments     $ 83