XML 119 R54.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Rate and Regulatory Matters (Regulatory Framework-Illinois) (Details) - Ameren Illinois | 12 Months Ended
--- | ---
Dec. 31, 2024 numberOfProposedPerformanceMetrics
FEJA |
Public Utilities, General Disclosures [Line Items] |
Public Utilities, Approved Return on Equity, Percentage | 5.80%
Return on equity adjustment | 2.00%
Natural gas |
Public Utilities, General Disclosures [Line Items] |
Number of months to complete a regulatory rate review | 11 months
Electric Distribution |
Public Utilities, General Disclosures [Line Items] |
MYRP return on equity adjustment | 0.24%
Number of performance metrics | 7
Electric Distribution | FEJA |
Public Utilities, General Disclosures [Line Items] |
Regulatory asset, amortization period | 2 years
Electric Distribution | RBA |
Public Utilities, General Disclosures [Line Items] |
Regulatory asset, amortization period | 2 years
Maximum |
Public Utilities, General Disclosures [Line Items] |
Public utilities, approved rate increase (decrease), percentage | 105.00%

X
- Definition Potential return on equity adjustment under an MYRP. + References No definition available. + Details
Name: | aee_MYRPReturnOnEquityAdjustment
Namespace Prefix: | aee_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Performance Metrics + References No definition available. + Details
Name: | aee_NumberOfPerformanceMetrics
Namespace Prefix: | aee_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of months it takes to complete a regulatory rate review. + References No definition available. + Details
Name: | aee_Numberofmonthstocompletearegulatoryratereview
Namespace Prefix: | aee_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Return on equity adjustment related to the achievement of annual energy efficiency goals. + References No definition available. + Details
Name: | aee_Returnonequityadjustment
Namespace Prefix: | aee_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=aee_FEJAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aee_AmerenIllinoisCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=srt_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=aee_RBAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |