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Derivatives and Risk Management Activities - Broker Receivable/Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivative assets and liabilities    
Initial margin $ 53 $ 77
Variation margin posted/(returned) 49 (65)
Letters of credit (90) (205)
Net broker receivable 72  
Net broker payable   (13)
Exchange Traded    
Derivative assets and liabilities    
Letters of credit $ (30) $ (25)