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Rate And Regulatory Matters (Narrative-Missouri) (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2024 MWh | Sep. 30, 2023 MWh | Dec. 31, 2022 MWh | Sep. 30, 2022 MWh | Jun. 30, 2022 MWh | Sep. 30, 2024 USD ($) MWh | Sep. 30, 2023 USD ($) | Dec. 31, 2027 USD ($) | Dec. 31, 2026 USD ($) | Dec. 31, 2025 USD ($) | Nov. 30, 2023
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | $ 3,029 | $ 2,571 |  |  |  |
Union Electric Company |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cass County, Boomtown, and Huck Finn Solar Project Purchase Price |  |  |  |  |  | 900 |  |  |  |  |
Capital expenditures |  |  |  |  |  | 1,839 | $ 1,255 |  |  |  |
Union Electric Company | Rush Island Energy Center |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
MoPSC Approved Costs to be Securitized |  |  |  |  |  | $ 470 |  |  |  |  |
Regulatory Asset, Amortization Period |  |  |  |  |  |  |  |  |  |  | 15 years
Union Electric Company | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh |  |  |  |  |  | 500 |  |  |  |  |
Union Electric Company | Generation Facilities |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | $ 1,700 |  |  |  |  |
Union Electric Company | Electric | Pending Rate Case |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  | $ 446 |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  | 10.25% |  |  |  |  |
Public Utilities, Requested Equity Capital Structure, Percentage |  |  |  |  |  | 52.00% |  |  |  |  |
Rate Base |  |  |  |  |  | $ 14,000 |  |  |  |  |
Months to complete a rate proceeding |  |  |  |  |  | 11 months |  |  |  |  |
Union Electric Company | Electric | MEEIA 2024 | Forecast |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Energy efficiency investments in MEEIA 2019 programs |  |  |  |  |  |  |  | $ 22 | $ 51 | $ 51 |
Percentage of MEEIA Energy Efficiency Goals Achieved |  |  |  |  |  |  |  |  |  | 100.00% |
Incentive award if energy efficiency goals are exceeded |  |  |  |  |  |  |  | $ 2 | $ 5 | $ 5 |
Union Electric Company | Build-transfer | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh |  | 300 |  | 200 | 150 |  |  |  |  |  |
Union Electric Company | Development-transfer | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh |  | 150 |  |  |  |  |  |  |  |  |
Union Electric Company | Self-build | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh |  | 50 | 50 |  |  |  |  |  |  |  |
Union Electric Company | Self-build | Natural Gas Generation Facility |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh | 800 |  |  |  |  |  |  |  |  |  |
Union Electric Company | Natural gas | Pending Rate Case |  |  |  |  |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  | $ 40 |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  | 10.25% |  |  |  |  |
Public Utilities, Requested Equity Capital Structure, Percentage |  |  |  |  |  | 52.00% |  |  |  |  |
Rate Base |  |  |  |  |  | $ 531 |  |  |  |  |
Months to complete a rate proceeding |  |  |  |  |  | 11 months |  |  |  |  |

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