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Short-Term Debt And Liquidity (Narrative) (Details) $ in Billions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 | Jun. 30, 2024 USD ($) | Jun. 30, 2023
Credit Agreements |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Net Liquidity Available | $ 1.9 |  | $ 1.9 |
Actual debt-to-capital ratio | 0.61 |  | 0.61 |
Utilities |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Short-term Debt, Weighted Average Interest Rate, over Time | 5.51% | 5.28% | 5.41% | 5.04%
Union Electric Company | Missouri Credit Agreement |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Actual debt-to-capital ratio | 0.49 |  | 0.49 |
Ameren Illinois Company | Illinois Credit Agreement |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Actual debt-to-capital ratio | 0.45 |  | 0.45 |

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