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Rate And Regulatory Matters (Narrative-Missouri) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($) numberOfCountriesInvestigatedByTheDOC | Sep. 30, 2022 USD ($) | Jun. 30, 2022 MWh | Mar. 31, 2022 USD ($) MWh
Rate And Regulatory Matters [Line Items] |  |  |  |
Capital expenditures | $ 931 |  |  | $ 774
Union Electric Company |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |
Capital expenditures | $ 481 |  |  | $ 414
Missouri Renewable Energy Standard Percentage | 15.00% |  |  |
Missouri Renewable Energy Standard Percentage - Solar | 2.00% |  |  |
Number of Countries Investigated by the DOC | numberOfCountriesInvestigatedByTheDOC | 4 |  |  |
Union Electric Company | Wind Generation Facility |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |
Amount of Megawatts | MWh |  |  | 200 | 150
Capital expenditures | $ 350 |  |  |
Union Electric Company | Electric | Pending Rate Case |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | 140 | $ 316 |  |
Union Electric Company | Electric | MEEIA 2024 [Domain] |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |
Energy efficiency investments in MEEIA 2024 programs | $ 122 |  |  |
Percentage of Energy Efficiency Goals Achieved | 100.00% |  |  |
Incentive Award if Energy Efficiency Goals Are Achieved | $ 55 |  |  |
Incentive Awards if Energy Efficiency Goals Are Exceeded | $ 14 |  |  |
Union Electric Company | Maximum |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |
Percentage of energy sourced from renewable resources | 100.00% |  |  |

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