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Derivatives and Risk Management Activities - Broker Receivable/Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Offsetting Assets, Liabilities    
Initial margin $ 74 $ 93
Variation margin returned (85) (236)
Letters of credit (144) (102)
Net broker payable (36) (168)
Exchange traded    
Offsetting Assets, Liabilities    
Letters of credit $ (25) $ (25)