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Rate And Regulatory Matters (Narrative-Illinois) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2025 | Dec. 31, 2024 | Nov. 30, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Oct. 31, 2023 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | $ 4,319 | $ 3,597 | $ 3,351
Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,467 | $ 1,731 | $ 1,601
Natural gas |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of energy sourced from renewable resources |  |  |  |  | 100.00% |  |  |  |  |  |  |
Natural gas | Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percent of requested return on equity |  |  |  | 9.89% |  |  |  |  |  |  |  |
Percentage of requested equity capital structure |  |  |  | 52.00% |  |  |  |  |  |  |  |
IETL | Electric Distribution | Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Multi-year rate plan approved revenue requirement |  |  |  |  |  |  |  |  |  | $ 1,206 |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  |  |  |  |  |  | 8.72% |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |
Approved rate base |  | $ 4,200 |  |  |  |  |  |  |  | $ 4,200 |  |
Multi-year rate plan requested revenue requirement |  |  |  |  |  |  |  |  |  | 1,196 |  |
American Illinois Proposed Average Annual Rate Base (in Billions) |  |  |  |  |  |  |  |  |  | 4,000 |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 309 |  |
IETL | Electric Distribution | Ameren Illinois | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Multi-year rate plan approved revenue requirement |  |  |  |  |  |  | $ 1,422 | $ 1,367 | $ 1,287 |  |  |
Approved rate base |  |  |  |  |  |  | 4,800 | 4,600 | 4,400 |  |  |
Multi-year rate plan requested revenue requirement |  |  |  |  |  |  | 1,397 | 1,350 | 1,282 |  |  |
American Illinois Proposed Average Annual Rate Base (in Billions) |  |  |  |  |  |  | $ 4,700 | $ 4,500 | $ 4,300 |  |  |
Pending Rate Case | Electric Distribution | Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative rate increase |  | $ 158 |  |  |  |  |  |  |  |  |  |
Percentage of requested equity capital structure |  | 50.00% |  |  |  |  |  |  |  |  |  |
Pending Rate Case | Natural gas | Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | $ 30 |  |  |  |  |  |
Pending Rate Case | Electric Energy-Efficiency | Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate base |  |  | $ 434 |  |  |  |  |  |  |  |  |
Cumulative rate increase |  |  | $ 126 |  |  |  |  |  |  |  |  |
Pending Rate Case | Electric Energy-Efficiency | Ameren Illinois | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative rate increase | $ 26 |  |  |  |  |  |  |  |  |  |  |
Delivery Service Rate Order | Natural gas | Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative rate increase |  |  |  |  | $ 140 |  |  |  |  |  |  |
Delivery Service Rate Order | Natural gas | Ameren Illinois | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 10.70% |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage | 52.00% |  |  |  |  |  |  |  |  |  |  |
Approved rate base | $ 3,300 |  |  |  |  |  |  |  |  |  |  |
Final Rate Order | Natural gas | Ameren Illinois |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  | 9.44% |  |  |  |  |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |
Approved rate base |  |  |  |  | $ 2,850 |  |  |  |  |  |  |
Cumulative rate increase |  |  |  |  | 112 |  |  |  |  |  |  |
Capital expenditures |  |  |  | $ 93 | $ 93 |  |  |  |  |  |  |
Final Rate Order | Natural gas | Ameren Illinois | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.44% |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | $ 48 |  |  |  |  |  |  |  |  |  |  |

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