XML 139 R59.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Short-Term Debt And Liquidity (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) lender | Dec. 31, 2022
Utilities |  |
Short-term Debt [Line Items] |  |
Average interest rate | 5.29% | 1.95%
Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Number of lenders | lender | 21 |
Line of credit facility, maximum borrowing capacity, per lender | $ 156,000,000 |
Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 2,600,000,000 |
Commitment fee amount | $ 100,000,000 |
Actual debt-to-capital ratio | 0.59 |
Multiyear Credit Facility | Maximum |  |
Short-term Debt [Line Items] |  |
Actual debt-to-capital ratio | 0.65 |
Missouri Credit Agreement |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,400,000,000 |
Missouri Credit Agreement | Ameren Missouri |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000,000 |
Actual debt-to-capital ratio | 0.50 |
Missouri Credit Agreement | Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,700,000,000 |
Illinois Credit Agreement |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 1,200,000,000 |
Illinois Credit Agreement | Ameren Illinois |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000,000 |
Actual debt-to-capital ratio | 0.46 |
Illinois Credit Agreement | Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,500,000,000 |
Credit Agreements |  |
Short-term Debt [Line Items] |  |
Net liquidity available | 2,100,000,000 |
Covenant terms, default provisions, maximum indebtedness | $ 100,000,000 |

X
- Definition Line of Credit Facility, Covenant Terms, Default Provision, Maximum Indebtedness + References No definition available. + Details
Name: | aee_LineOfCreditFacilityCovenantTermsDefaultProvisionMaximumIndebtedness
Namespace Prefix: | aee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line Of Credit Facility Maximum Borrowing Capacity Per Lender + References No definition available. + Details
Name: | aee_LineOfCreditFacilityMaximumBorrowingCapacityPerLender
Namespace Prefix: | aee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The net liquidity available is based on credit facility borrowings, commercial paper outstanding, and letters of credit issued under the Credit Agreements, along with cash and cash equivalents. + References No definition available. + Details
Name: | aee_NetLiquidityAvailable
Namespace Prefix: | aee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number Of Lenders + References No definition available. + Details
Name: | aee_NumberOfLenders
Namespace Prefix: | aee_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Short Term Debt, Weighted Average Interest Rate During Period + References No definition available. + Details
Name: | aee_ShortTermDebtWeightedAverageInterestRateDuringPeriod
Namespace Prefix: | aee_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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_ShortTermDebtLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=aee_UtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=aee_MultiyearCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=aee_MultiyearCreditFacilityMember
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: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=aee_MissouriCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=aee_IllinoisCreditAgreementMember
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_DebtInstrumentAxis=aee_CreditAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |