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Rate And Regulatory Matters (Narrative-Missouri) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) MWh | Sep. 30, 2022 MWh | Jun. 30, 2022 USD ($) MWh | Mar. 31, 2022 MWh | Jun. 30, 2023 USD ($) numberOfCountriesInvestigatedByTheDOC | Jun. 30, 2022 USD ($)
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  | $ 335 |  | $ 316 |  | $ 655 | $ 615
Other Income, Net |  | 82 |  | 62 |  | 160 | 122
Capital expenditures |  |  |  |  |  | 1,822 | 1,538
Revenues |  | 1,760 |  | 1,726 |  | 3,822 | 3,605
Union Electric Company |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  | 186 |  | 178 |  | 362 | 342
Other Income, Net |  | $ 22 |  | $ 24 |  | 41 | 47
Capital expenditures |  |  |  |  |  | $ 914 | $ 806
Number of Countries Investigated by the DOC | numberOfCountriesInvestigatedByTheDOC |  |  |  |  |  | 4 |
Union Electric Company | Solar generation facility |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | $ 350 |
Union Electric Company | Electric | Final Rate Order |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | 140 |
Reduction to annualized base level of net energy costs |  |  |  |  |  | 40 |
Depreciation and amortization |  |  |  |  |  | 90 |
Other Income, Net |  |  |  |  |  | $ 100 |
Union Electric Company | Electric | MEEIA 2019 [Domain] | Subsequent Event |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Revenues | $ 12 |  |  |  |  |  |
Energy efficiency investments in MEEIA 2019 programs | $ 76 |  |  |  |  |  |
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 | Maximum |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Percentage of energy sourced from renewable resources |  | 100.00% |  |  |  |  |

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