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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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