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Rate and Regulatory Matters (Narrative-Missouri) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2023 USD ($) | Aug. 31, 2023 USD ($) | Jun. 30, 2023 MWh | Sep. 30, 2022 MWh | Jun. 30, 2022 MWh | Mar. 31, 2022 MWh | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) MWh | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 1,387,000,000 | $ 1,289,000,000 | $ 1,146,000,000
Other Income, Net |  |  |  |  |  |  |  |  | 348,000,000 | 226,000,000 | 202,000,000
Capital expenditures |  |  |  |  |  |  |  |  | 3,597,000,000 | 3,351,000,000 | 3,479,000,000
Revenues |  |  |  |  |  |  |  |  | 7,500,000,000 | 7,957,000,000 | 6,394,000,000
Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  | $ 1,800,000,000 |  |  |
Ameren Missouri |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 783,000,000 | 732,000,000 | 632,000,000
Other Income, Net |  |  |  |  |  |  |  |  | $ 130,000,000 | 99,000,000 | 99,000,000
Amount of Megawatts | MWh |  |  |  |  |  |  |  |  | 102 |  |
Capital expenditures |  |  |  |  |  |  |  |  | $ 1,760,000,000 | 1,690,000,000 | 2,015,000,000
Ameren Missouri | Rush Island Energy Center |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Costs to be securitized | $ 519,000,000 |  |  |  |  |  |  |  |  |  |
Amortization of regulatory asset | $ 15 |  |  |  |  |  |  |  |  |  |
Ameren Missouri | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | $ 650,000,000 |  |
Ameren Missouri | Maximum |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of energy sourced from renewable resources |  |  |  |  |  |  |  |  | 100.00% |  |
Ameren Missouri | Electric | Final Rate Order |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 140,000,000 |  |
Reduction to annualized base level of net energy costs |  |  |  |  |  |  |  |  | 40,000,000 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 90,000,000 |  |
Other Income, Net |  |  |  |  |  |  |  |  | 100,000,000 |  |
Ameren Missouri | Build-transfer | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh |  |  | 300 |  | 200 | 150 |  |  |  |  |
Ameren Missouri | Development-transfer | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh |  |  | 150 |  |  |  |  |  |  |  |
Ameren Missouri | Self-build | Solar generation facility |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of Megawatts | MWh |  |  | 50 | 50 |  |  |  |  |  |  |
Ameren Missouri | MEEIA 2019 | Electric |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 12,000,000 |  |  |  |  |  |  | $ 12,000,000 | $ 22,000,000 | $ 9,000,000
Ameren Missouri | MEEIA 2019 | Electric | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Energy efficiency investments in MEEIA 2019 programs |  |  |  |  |  |  |  | $ 76,000,000 |  |  |
Ameren Missouri | MEEIA 2024 | Electric | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Energy efficiency investments in MEEIA 2019 programs |  |  |  |  |  |  | $ 123,000,000 |  |  |  |
Percentage of MEEIA energy efficiency goals achieved |  |  |  |  |  |  | 100.00% |  |  |  |
Incentive award if energy efficiency goals are achieved |  |  |  |  |  |  | $ 56,000,000 |  |  |  |
Incentive award if energy efficiency goals are exceeded |  |  |  |  |  |  | $ 14,000,000 |  |  |  |

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