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Short-Term Debt And Liquidity (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) lender | Dec. 31, 2021
Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 2,600,000,000 |
Line of Credit Facility, 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 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,400,000,000 |
Illinois Credit Agreement 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 1,200,000,000 |
Credit Agreements |  |
Short-term Debt [Line Items] |  |
Net Liquidity Available | 1,500,000,000 |
Covenant terms, default provisions, maximum indebtedness | 100,000,000 |
Parent Company | Missouri Credit Agreement 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 1,000,000,000 |
Parent Company | Illinois Credit Agreement 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 700,000,000 |
Union Electric Company | Missouri Credit Agreement 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000,000 |
Actual debt-to-capital ratio | 0.49 |
Ameren Illinois Company | Illinois Credit Agreement 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,000,000,000 |
Actual debt-to-capital ratio | 0.46 |
Utilities [Member] |  |
Short-term Debt [Line Items] |  |
Short Term Debt, Weighted Average Interest Rate During Period | 1.95% | 0.17%
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 | Missouri Credit Agreement 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 1,700,000,000 |
Multiyear Credit Facility | Illinois Credit Agreement 2012 |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,500,000,000 |

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

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- 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

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- 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
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Period Type: | instant

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- Definition Number Of Lenders + References No definition available. + Details
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- Definition Short Term Debt, Weighted Average Interest Rate During Period + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Period Type: | instant

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- 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
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