v3.26.3
Derivative Instruments and Hedging Activities - Schedule of Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative assets, gross $ 414 $ 156
Derivative liabilities, gross (72) (360)
Gross Amounts of Recognized Assets/Liabilities 342 (204)
Derivative Instruments 0 0
Net Amount 342 (204)
Energy-related commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets, gross 14 14
Derivative instruments, assets 0 0
Derivative assets, Net amount 14 14
Derivative liabilities, gross (72) (333)
Derivative instruments, liabilities 0 0
Derivative liabilities, net amount (72) (333)
Gross Amounts of Recognized Assets/Liabilities (58) (319)
Derivative Instruments 0 0
Net Amount (58) (319)
Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets, gross 400 142
Derivative instruments, assets 0 0
Derivative assets, Net amount 400 142
Derivative liabilities, gross   (27)
Derivative instruments, liabilities   0
Derivative liabilities, net amount   (27)
Gross Amounts of Recognized Assets/Liabilities 400 115
Derivative Instruments 0 0
Net Amount $ 400 $ 115