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Short-Term Debt and Liquidity (Short-Term Debt Activity) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 1,168 | $ 702
Weighted-average interest rate | 5.10% | 0.75%
Short-term Debt, Maximum Amount Outstanding During Period | $ 1,381 | $ 1,101
Peak interest rate | 5.60% | 2.05%
Parent Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 595 | $ 374
Weighted-average interest rate | 5.14% | 0.87%
Short-term Debt, Maximum Amount Outstanding During Period | $ 841 | $ 595
Peak interest rate | 5.55% | 2.05%
Union Electric Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 343 | $ 271
Weighted-average interest rate | 5.04% | 0.65%
Short-term Debt, Maximum Amount Outstanding During Period | $ 592 | $ 539
Peak interest rate | 5.55% | 2.05%
Ameren Illinois Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 230 | $ 57
Weighted-average interest rate | 5.10% | 0.47%
Short-term Debt, Maximum Amount Outstanding During Period | $ 450 | $ 142
Peak interest rate | 5.60% | 2.05%

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