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v3.24.0.1

Rate and Regulatory Matters (Narrative-Federal) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Capital expenditures |  |  | $ 3,597 | $ 3,351 | $ 3,479
ROE Change |  |  | 0.50% |  |
Revenues |  |  | $ 7,500 | 7,957 | 6,394
Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Capital expenditures |  | $ 1,800 |  |  |
Ameren Illinois |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Capital expenditures |  |  | 1,731 | 1,601 | 1,432
Revenues |  |  | 3,482 | $ 3,756 | $ 2,895
Midwest Independent Transmission System Operator, Inc |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Revenues |  |  | 21 |  |
Midwest Independent Transmission System Operator, Inc | Ameren Illinois |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Revenues |  |  | $ 15 |  |
Final Rate Order | Midwest Independent Transmission System Operator, Inc |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 10.02% |  |  |  |

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