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v3.22.2.2

Rate And Regulatory Matters (Narrative-Missouri) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) | Jun. 30, 2022 MWh | Mar. 31, 2022 MWh | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) numberOfCountriesInvestigatedByTheDOC | Sep. 30, 2021 USD ($)
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |
Revenues | $ 2,306 |  |  | $ 1,811 | $ 5,911 | $ 4,849
Union Electric Company |  |  |  |  |  |
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 |
Union Electric Company | 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 |
Union Electric Company | Wind Generation Facility |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |
Amount of Megawatts | MWh |  | 200 | 150 |  |  |
Union Electric Company | Final Rate Order | Electric | MEEIA 2019 [Domain] |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |
Revenues | $ 12 |  |  | $ 9 |  |
Union Electric Company | 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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