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Short-Term Debt And Liquidity (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2025 USD ($) lender | Dec. 31, 2024
Utilities |  |
Short-term Debt [Line Items] |  |
Average interest rate | 4.39% | 5.19%
Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Number of lenders | lender | 20 |
Line of credit facility, maximum borrowing capacity, per lender | $ 208,000,000 |
Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 3,200,000,000 |
Commitment fee amount | $ 120,000,000 |
Actual debt-to-capital ratio | 0.59 |
Multiyear Credit Facility | Maximum |  |
Short-term Debt [Line Items] |  |
Actual debt-to-capital ratio | 0.675 |
Multiyear Credit Facility | Maximum | Ameren Missouri |  |
Short-term Debt [Line Items] |  |
Actual debt-to-capital ratio | 0.65 |
Multiyear Credit Facility | Maximum | Ameren Illinois |  |
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 | $ 1,900,000,000 |
Missouri Credit Agreement | Ameren Missouri |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,600,000,000 |
Actual debt-to-capital ratio | 0.49 |
Missouri Credit Agreement | Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 2,400,000,000 |
Illinois Credit Agreement |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 1,300,000,000 |
Illinois Credit Agreement | Ameren Illinois |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,100,000,000 |
Actual debt-to-capital ratio | 0.45 |
Illinois Credit Agreement | Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 1,600,000,000 |
Credit Agreements |  |
Short-term Debt [Line Items] |  |
Commitment fee amount | 33,000,000 |
Net liquidity available | 2,500,000,000 |
Covenant terms, default provisions, maximum indebtedness | $ 150,000,000 |

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- Definition Line Of Credit Facility Maximum Borrowing Capacity Per Lender + References No definition available. + Details
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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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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-15 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-12 + Details
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