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Early Plant Retirements/Asset Dispositions Early Plant Retirements/Asset Dispositions (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Early Plant Retirements [Abstract] |  |
ZEC Charge per kwh | $ 0.004 |
ZEC Charge per MWh | 10 |
Early Plant Retirements/Asset Dispositions [Line Items] |  |
ZEC Charge per MWh | 10 |
Expected Nuclear Production tax Credit per MWh | $ 15 |
Fossil Fuel Plant |  |
Early Plant Retirements [Abstract] |  |
Impairment of Long-Lived Assets to be Disposed of |  | $ 43,000,000
Early Plant Retirements/Asset Dispositions [Line Items] |  |
Impairment of Long-Lived Assets to be Disposed of |  | 43,000,000
Energy Holdings [Member] |  |
Early Plant Retirements [Abstract] |  |
Impairment of Long-Lived Assets to be Disposed of |  | 53,000,000
Early Plant Retirements/Asset Dispositions [Line Items] |  |
Impairment of Long-Lived Assets to be Disposed of |  | $ 53,000,000

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