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v3.22.4

Rate and Regulatory Matters (Narrative-Federal) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory liabilities |  | $ 5,309 | $ 5,848 |
ROE Change |  | 0.50% |  |
Revenues |  | $ 7,957 | 6,394 | $ 5,794
Ameren Illinois Company |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory liabilities |  | 2,313 | 2,374 |
Revenues |  | 3,756 | $ 2,895 | $ 2,535
Midwest Independent Transmission System Operator, Inc |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Revenues |  | 19 |  |
Midwest Independent Transmission System Operator, Inc | Ameren Illinois Company |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Revenues |  | 13 |  |
Final Rate Order | Ameren Illinois Company |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Regulatory liabilities |  | $ 9 |  |
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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