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Callaway Energy Center (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Accidental Outage - Nuclear Electric Insurance Ltd |
Nuclear Waste Matters [Line Items] |
Amount of Weekly Indemnity Coverage Commencing Twelve Weeks After Power Outage | $ 4.5
Union Electric Company |
Nuclear Waste Matters [Line Items] |
Frequency of Decommissioning Cost Study | 3 years
Union Electric Company | Minimum | Nuclear Decommissioning Trust Fund |
Nuclear Waste Matters [Line Items] |
Trust Fund Investments, Target Allocation Percentage | 60.00%
Union Electric Company | Maximum | Nuclear Decommissioning Trust Fund |
Nuclear Waste Matters [Line Items] |
Trust Fund Investments, Target Allocation Percentage | 70.00%
Union Electric Company | Nuclear Plant |
Nuclear Waste Matters [Line Items] |
Estimated Nuclear Generator Repairs | $ 60.0
Annual decommissioning costs included in costs of service | $ 7.0

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