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Short-Term Debt and Liquidity (Short-Term Debt Activity) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 578 | $ 1,168
Weighted-average interest rate | 5.56% | 5.10%
Short-term Debt, Maximum Amount Outstanding During Period | $ 1,084 | $ 1,381
Peak interest rate | 5.68% | 5.60%
Parent Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 84 | $ 595
Weighted-average interest rate | 5.55% | 5.14%
Short-term Debt, Maximum Amount Outstanding During Period | $ 301 | $ 841
Peak interest rate | 5.60% | 5.55%
Union Electric Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 109 | $ 343
Weighted-average interest rate | 5.53% | 5.04%
Short-term Debt, Maximum Amount Outstanding During Period | $ 509 | $ 592
Peak interest rate | 5.68% | 5.55%
Ameren Illinois Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 385 | $ 230
Weighted-average interest rate | 5.57% | 5.10%
Short-term Debt, Maximum Amount Outstanding During Period | $ 694 | $ 450
Peak interest rate | 5.68% | 5.60%

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