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Derivative Instruments and Hedging Activity - Narrative (Details) MWh in Millions, $ in Millions | Mar. 31, 2026 USD ($) MWh | Dec. 31, 2025 USD ($) MWh
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Derivative [Line Items] |  |
Derivative Instruments with Contingent Features Liabilities, at Fair Value | $ 6 | $ 10
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 2,200 | $ 2,200
Commodity Contract |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | MWh | 2.4 | 3.1

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