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Short-Term Debt And Liquidity (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) lender | Dec. 31, 2023
Utilities |  |
Short-term Debt [Line Items] |  |
Average interest rate | 5.19% | 5.29%
Multiyear Credit Facility |  |
Short-term Debt [Line Items] |  |
Number of lenders | lender | 20 |
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 | 0.60 |
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 | 0.48 |
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 | 0.45 |
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 | 1,400,000,000 |
Covenant terms, default provisions, maximum indebtedness | $ 100,000,000 |

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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 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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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