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Related Party Transactions (Schedule of Related Party Electric Power Supply Agreements) (Details) - Ameren Illinois Company - Ameren Illinois Power Supply Agreements with Ameren Missouri | 12 Months Ended
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Dec. 31, 2022 MWh $ / MWh
April 2019 Procurement |
Schedule of Related Party Electric Power Supply Agreements [Line Items] |
Related Party Long Term Contract For Purchase Of Electric Power | MWh | 288,000
Related Party Long Term Contract For Purchase Of Electric Power Rate | $ / MWh | 35
September 2019 Procurement |
Schedule of Related Party Electric Power Supply Agreements [Line Items] |
Related Party Long Term Contract For Purchase Of Electric Power | MWh | 170,800
Related Party Long Term Contract For Purchase Of Electric Power Rate | $ / MWh | 29
September 2020 Procurement |
Schedule of Related Party Electric Power Supply Agreements [Line Items] |
Related Party Long Term Contract For Purchase Of Electric Power | MWh | 204,800
Related Party Long Term Contract For Purchase Of Electric Power Rate | $ / MWh | 31
April 2021 Procurement |
Schedule of Related Party Electric Power Supply Agreements [Line Items] |
Related Party Long Term Contract For Purchase Of Electric Power | MWh | 33,600
Related Party Long Term Contract For Purchase Of Electric Power Rate | $ / MWh | 34
September 2021 Procurement |
Schedule of Related Party Electric Power Supply Agreements [Line Items] |
Related Party Long Term Contract For Purchase Of Electric Power | MWh | 136,000
Related Party Long Term Contract For Purchase Of Electric Power Rate | $ / MWh | 37

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