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Derivative Instruments and Hedging Activity - Narrative (Details) MWh in Millions, $ in Millions | Oct. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) MWh | Dec. 31, 2022 USD ($) MWh
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Derivative Instruments with Contingent Features Liabilities, at Fair Value |  | $ 15 | $ 37
Subsequent Event | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 1,850 |  |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount |  | $ 2,200 | $ 7,800
Commodity Contract |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount | MWh |  | 6.0 | 5.7

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