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Accounting for Derivative Instruments and Hedging Activities - Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Cash collateral received in support of energy risk management activities $ (12) $ (84)
Derivative liabilities (3,820) (5,507)
Cash Collateral Posted 449 441
Total Derivative Contracts    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Gross Amounts of Recognized Assets / Liabilities 383 648
Derivative Instruments 0 0
Cash Collateral (Held) / Posted 160 71
Net Amount 543 719
Interest rate contracts    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative assets 2 12
Derivative Instruments (2) (8)
Cash collateral received in support of energy risk management activities 0 0
Net Amount 0 4
Derivative liabilities (30) (8)
Derivative Instruments 2 8
Cash Collateral Posted 0 0
Net Amount (28) 0
Gross Amounts of Recognized Assets / Liabilities (28) 4
Derivative Instruments 0 0
Cash Collateral (Held) / Posted 0 0
Net Amount (28) 4
Foreign exchange    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative assets 5 5
Derivative Instruments (1) (5)
Cash collateral received in support of energy risk management activities 0 0
Net Amount 4 0
Derivative liabilities (2) (9)
Derivative Instruments 1 5
Cash Collateral Posted 0 0
Net Amount (1) (4)
Gross Amounts of Recognized Assets / Liabilities 3 (4)
Derivative Instruments 0 0
Cash Collateral (Held) / Posted 0 0
Net Amount 3 (4)
Commodity contracts    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative assets 4,196 6,138
Derivative Instruments (3,224) (4,926)
Cash collateral received in support of energy risk management activities (6) (74)
Net Amount 966 1,138
Derivative liabilities (3,588) (5,356)
Derivative Instruments 3,224 4,926
Cash Collateral Posted 166 145
Net Amount (198) (285)
Gross Amounts of Recognized Assets / Liabilities 608 782
Derivative Instruments 0 0
Cash Collateral (Held) / Posted 160 71
Net Amount 768 853
Consumer Financing Program    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative liabilities (200) (134)
Derivative Instruments 0 0
Cash Collateral Posted 0 0
Net Amount $ (200) $ (134)