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Short-Term Debt and Liquidity (Short-Term Debt Activity) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 620 | $ 1,174
Weighted-average interest rate | 5.53% | 5.24%
Short-term Debt, Maximum Amount Outstanding During Period | $ 1,542 | $ 1,381
Peak interest rate | 5.68% | 5.60%
Parent Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 177 | $ 687
Weighted-average interest rate | 5.46% | 5.29%
Short-term Debt, Maximum Amount Outstanding During Period | $ 948 | $ 1,127
Peak interest rate | 5.60% | 5.60%
Union Electric Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 187 | $ 306
Weighted-average interest rate | 5.52% | 5.15%
Short-term Debt, Maximum Amount Outstanding During Period | $ 576 | $ 592
Peak interest rate | 5.68% | 5.60%
Ameren Illinois Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 256 | $ 181
Weighted-average interest rate | 5.57% | 5.15%
Short-term Debt, Maximum Amount Outstanding During Period | $ 694 | $ 450
Peak interest rate | 5.68% | 5.60%

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