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Derivatives and Risk Management Activities - Broker Receivable/Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Offsetting Assets, Liabilities    
Initial margin $ 64 $ 77
Variation margin posted/(returned) 102 (65)
Letters of credit (161) (205)
Net broker receivable 141  
Net broker payable   (13)
Exchange Traded    
Offsetting Assets, Liabilities    
Letters of credit $ (25) $ (25)