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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, 2023 | Sep. 30, 2022
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 1,174 | $ 791
Weighted-average interest rate | 5.24% | 1.47%
Short-term Debt, Maximum Amount Outstanding During Period | $ 1,381 | $ 1,222
Peak interest rate | 5.60% | 3.60%
Parent Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 687 | $ 439
Weighted-average interest rate | 5.29% | 1.58%
Short-term Debt, Maximum Amount Outstanding During Period | $ 1,127 | $ 690
Peak interest rate | 5.60% | 3.55%
Union Electric Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 306 | $ 253
Weighted-average interest rate | 5.15% | 1.16%
Short-term Debt, Maximum Amount Outstanding During Period | $ 592 | $ 539
Peak interest rate | 5.60% | 3.55%
Ameren Illinois Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 181 | $ 99
Weighted-average interest rate | 5.15% | 1.77%
Short-term Debt, Maximum Amount Outstanding During Period | $ 450 | $ 354
Peak interest rate | 5.60% | 3.60%

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