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Short-Term Debt And Liquidity (Commercial Paper) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 1,166 | $ 852
Commercial paper issuances outstanding at period-end | $ 536 | $ 1,070
Weighted-average interest rate | 5.32% | 2.28%
Peak amount outstanding during period | $ 1,526 | $ 1,267
Peak interest rate | 5.68% | 4.95%
Ameren (parent) |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 726 | $ 485
Commercial paper issuances outstanding at period-end | $ 0 | $ 477
Weighted-average interest rate | 5.38% | 2.41%
Peak amount outstanding during period | $ 1,298 | $ 718
Peak interest rate | 5.65% | 4.80%
Ameren Missouri |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 274 | $ 229
Commercial paper issuances outstanding at period-end | $ 170 | $ 329
Weighted-average interest rate | 5.22% | 1.71%
Peak amount outstanding during period | $ 592 | $ 539
Peak interest rate | 5.68% | 4.95%
Ameren Illinois |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 166 | $ 138
Commercial paper issuances outstanding at period-end | $ 366 | $ 264
Weighted-average interest rate | 5.23% | 2.79%
Peak amount outstanding during period | $ 450 | $ 404
Peak interest rate | 5.68% | 4.80%

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