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Derivatives and Risk Management Activities - Broker Receivable/Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Offsetting Assets, Liabilities    
Initial margin $ 97 $ 133
Variation margin posted/(returned) (154) 173
Letters of credit (58) (98)
Net broker payable (82)  
Net broker receivable   259
Exchange traded    
Offsetting Assets, Liabilities    
Letters of credit $ (25) $ (47)