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Derivative Instruments and Hedging Activities - Schedule of Net Notional Volume Buy/(Sell) of the Company’s Open Derivative Transactions Broken Out by Commodity (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) BTU MWh | Dec. 31, 2024 USD ($) MWh BTU
Long | Interest |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, notional amount | $ | $ 3,846 | $ 1,769
Heat Rate Call Option Commodity Contracts | Short | Power |  |
Derivatives, Fair Value [Line Items] |  |
Derivative nonmonetary notional amount (energy measure) | MWh | 24 | 25
Heat Rate Call Option Commodity Contracts | Short | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Derivative nonmonetary notional amount (energy measure) | BTU | 6 | 11

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