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Rate And Regulatory Matters (Narrative-Missouri) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Jun. 30, 2023 MWh | Sep. 30, 2022 USD ($) MWh | Jun. 30, 2022 MWh | Mar. 31, 2022 MWh | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Depreciation and amortization | $ 369 |  | $ 350 |  |  | $ 1,024 | $ 965
Other Income, Net | 101 |  | 58 |  |  | 261 | 180
Capital expenditures |  |  |  |  |  | 2,571 | 2,437
Revenues | 2,060 |  | 2,306 |  |  | 5,882 | 5,911
Union Electric Company |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Depreciation and amortization | 217 |  | 208 |  |  | 579 | 550
Other Income, Net | $ 44 |  | $ 25 |  |  | 85 | 72
Capital expenditures |  |  |  |  |  | 1,255 | $ 1,237
Union Electric Company | Solar generation facility |  |  |  |  |  |  |
Rate And Regulatory Matters [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | 650 |
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] |  |  |  |  |  |  |
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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