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Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 666 $ 749 $ 683 $ 67
Acquired balance from Direct Energy 0 0 0 112
Provision for credit losses 26 40 51 651
Write-offs (71) (35) (121) (83)
Recoveries collected 6 7 14 14
Ending balance $ 627 $ 761 627 $ 761
Decrease in provision for credit losses due finance hedge risk     403  
Decrease in provision for credit losses due to counterparty credit risk     120  
Decrease in provision for credit losses due to shortfall payments     $ 83