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Rate and Regulatory Matters (Regulatory Framework-Illinois) (Details) - Ameren Illinois Company | 12 Months Ended
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Dec. 31, 2022
IEIMA revenue requirement reconciliation adjustment |
Public Utilities, General Disclosures [Line Items] |
Public Utilities, Approved Return on Equity, Percentage | 5.80%
Amortization Period | 2 years
FEJA |
Public Utilities, General Disclosures [Line Items] |
Public Utilities, Approved Return on Equity, Percentage | 5.80%
Return on equity adjustment | 2.00%
QIP rider |
Public Utilities, General Disclosures [Line Items] |
QIP recovery begin date | 2 months
QIP rider reset | zero
Natural gas |
Public Utilities, General Disclosures [Line Items] |
Number of months to complete a regulatory rate review | 11 months
Electric Distribution | FEJA |
Public Utilities, General Disclosures [Line Items] |
Amortization Period | 2 years
Maximum | QIP rider |
Public Utilities, General Disclosures [Line Items] |
Public Utilities, Approved Rate Increase (Decrease), Percentage | 4.00%
Annual QIP rate cap | 5.50%
Maximum | Electric Distribution | FEJA |
Public Utilities, General Disclosures [Line Items] |
Return on equity penalty | 0.10%

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