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Short-Term Debt And Liquidity (Schedule Of Maximum Aggregate Amount Available On Credit Agreements) (Details) $ in Millions | Dec. 31, 2024 USD ($)
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Missouri Credit Agreement |
Line of Credit Facility [Line Items] |
Line of credit facility, maximum borrowing capacity | $ 1,400
Missouri Credit Agreement | Ameren (parent) |
Line of Credit Facility [Line Items] |
Line of credit facility, maximum borrowing capacity | 1,000
Missouri Credit Agreement | Ameren Missouri |
Line of Credit Facility [Line Items] |
Line of credit facility, maximum borrowing capacity | 1,000
Illinois Credit Agreement |
Line of Credit Facility [Line Items] |
Line of credit facility, maximum borrowing capacity | 1,200
Illinois Credit Agreement | Ameren (parent) |
Line of Credit Facility [Line Items] |
Line of credit facility, maximum borrowing capacity | 700
Illinois Credit Agreement | Ameren Illinois |
Line of Credit Facility [Line Items] |
Line of credit facility, maximum borrowing capacity | $ 1,000

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