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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, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Derivative assets, gross $ 135 $ 175
Derivative liabilities, gross (374) (371)
Fair value of gross derivative assets/(liabilities), net (239) (196)
Derivative instruments 0 0
Net amount (239) (196)
Energy-related commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets, gross 12 9
Derivative instruments, assets 0 0
Net amount 12 9
Derivative liabilities, gross (337) (371)
Derivative instruments, liabilities 0 0
Derivative liabilities, net amount (337) (371)
Fair value of gross derivative assets/(liabilities), net (325) (362)
Derivative instruments 0 0
Net amount (325) (362)
Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets, gross 123 166
Derivative instruments, assets 0 0
Net amount 123 166
Derivative liabilities, gross (37)  
Derivative instruments, liabilities 0  
Derivative liabilities, net amount (37)  
Fair value of gross derivative assets/(liabilities), net 86 166
Derivative instruments 0 0
Net amount $ 86 $ 166