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Short-Term Debt And Liquidity (Commercial Paper) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 762 | $ 1,166
Commercial paper issuances outstanding at period-end | $ 1,143 | $ 536
Weighted-average interest rate | 5.28% | 5.32%
Peak amount outstanding during period | $ 1,569 | $ 1,526
Peak interest rate | 5.68% | 5.68%
Ameren (parent) |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 377 | $ 726
Commercial paper issuances outstanding at period-end | $ 1,055 | $ 0
Weighted-average interest rate | 5.10% | 5.38%
Peak amount outstanding during period | $ 1,091 | $ 1,298
Peak interest rate | 5.60% | 5.65%
Ameren Missouri |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 192 | $ 274
Commercial paper issuances outstanding at period-end | $ 0 | $ 170
Weighted-average interest rate | 5.34% | 5.22%
Peak amount outstanding during period | $ 595 | $ 592
Peak interest rate | 5.68% | 5.68%
Ameren Illinois |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 193 | $ 166
Commercial paper issuances outstanding at period-end | $ 88 | $ 366
Weighted-average interest rate | 5.57% | 5.23%
Peak amount outstanding during period | $ 694 | $ 450
Peak interest rate | 5.68% | 5.68%

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