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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
Jun. 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 $ (688) $ (84)
Derivative liabilities (4,099) (5,507)
Cash Collateral Posted 384 441
Total Derivative Contracts    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Gross Amounts of Recognized Assets / Liabilities 2,046 648
Derivative Instruments 0 0
Cash Collateral (Held) / Posted (646) 71
Net Amount 1,400 719
Interest rate contracts    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative assets 26 12
Derivative Instruments (4) (8)
Cash collateral received in support of energy risk management activities 0 0
Net Amount 22 4
Derivative liabilities (4) (8)
Derivative Instruments 4 8
Cash Collateral Posted 0 0
Net Amount 0 0
Gross Amounts of Recognized Assets / Liabilities 22 4
Derivative Instruments 0 0
Cash Collateral (Held) / Posted 0 0
Net Amount 22 4
Foreign exchange    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative assets 9 5
Derivative Instruments 0 (5)
Cash collateral received in support of energy risk management activities 0 0
Net Amount 9 0
Derivative liabilities   (9)
Derivative Instruments   5
Cash Collateral Posted   0
Net Amount   (4)
Gross Amounts of Recognized Assets / Liabilities   (4)
Derivative Instruments   0
Cash Collateral (Held) / Posted   0
Net Amount   (4)
Commodity contracts    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative assets 6,110 6,138
Derivative Instruments (3,726) (4,926)
Cash collateral received in support of energy risk management activities (693) (74)
Net Amount 1,691 1,138
Derivative liabilities (3,944) (5,356)
Derivative Instruments 3,726 4,926
Cash Collateral Posted 47 145
Net Amount (171) (285)
Gross Amounts of Recognized Assets / Liabilities 2,166 782
Derivative Instruments 0 0
Cash Collateral (Held) / Posted (646) 71
Net Amount 1,520 853
Consumer Financing Program    
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid    
Derivative liabilities (151) (134)
Derivative Instruments 0 0
Cash Collateral Posted 0 0
Net Amount $ (151) $ (134)