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Short-Term Debt And Liquidity (Narrative) (Details) $ in Billions | 3 Months Ended
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Mar. 31, 2024 USD ($) | Mar. 31, 2023
Credit Agreements |  |
Short-term Debt [Line Items] |  |
Net Liquidity Available | $ 1.8 |
Actual debt-to-capital ratio | 0.60 |
Utilities |  |
Short-term Debt [Line Items] |  |
Short-term Debt, Weighted Average Interest Rate, over Time | 5.32% | 4.80%
Union Electric Company | Missouri Credit Agreement |  |
Short-term Debt [Line Items] |  |
Actual debt-to-capital ratio | 0.51 |
Ameren Illinois Company | Illinois Credit Agreement |  |
Short-term Debt [Line Items] |  |
Actual debt-to-capital ratio | 0.45 |

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