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Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 683 $ 67
Acquired balance from Direct Energy 0 112
Provision for credit losses 25 611
Write-offs (50) (48)
Recoveries collected 8 7
Ending balance 666 $ 749
Decrease in provision for credit losses due finance hedge risk 393  
Decrease in provision for credit losses due to counterparty credit risk 109  
Decrease in provision for credit losses due to shortfall payments $ 83