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Rate And Regulatory Matters (Narrative-Missouri) (Details) - Union Electric Company $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 MWh | Mar. 31, 2022 MWh | Jun. 30, 2022 USD ($) numberOfCountriesInvestigatedByTheDOC
Rate And Regulatory Matters [Line Items] |  |  |
Missouri Renewable Energy Standard Percentage |  |  | 15.00%
Missouri Renewable Energy Standard Percentage - Solar |  |  | 2.00%
Number of Countries Investigated by the DOC | numberOfCountriesInvestigatedByTheDOC |  |  | 4
Pending Rate Case | Electric |  |  |
Rate And Regulatory Matters [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 316
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.20%
Public Utilities, Requested Equity Capital Structure, Percentage |  |  | 51.90%
Rate Base |  |  | $ 11,600
Months to complete a rate proceeding |  |  | 11 months
Wind Generation Facility |  |  |
Rate And Regulatory Matters [Line Items] |  |  |
Amount of Megawatts | MWh | 200 | 150 |
Maximum |  |  |
Rate And Regulatory Matters [Line Items] |  |  |
PISA Rate Increase Limit Beginning 2024 |  |  | 2.50%
Public Utilities, Approved Rate Increase (Decrease), Percentage |  |  | 2.85%
Percentage of energy sourced from renewable resources |  |  | 100.00%

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