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Short-Term Debt And Liquidity (Commercial Paper) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 852 | $ 604
Commercial paper issuances outstanding at period-end | $ 1,070 | $ 545
Weighted-average interest rate | 2.28% | 0.22%
Peak amount outstanding during period(a) | $ 1,267 | $ 1,134
Peak interest rate | 4.95% | 0.38%
Parent Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 485 | $ 387
Commercial paper issuances outstanding at period-end | $ 477 | $ 277
Weighted-average interest rate | 2.41% | 0.22%
Peak amount outstanding during period(a) | $ 718 | $ 650
Peak interest rate | 4.80% | 0.38%
Union Electric Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 229 | $ 99
Commercial paper issuances outstanding at period-end | $ 329 | $ 165
Weighted-average interest rate | 1.71% | 0.22%
Peak amount outstanding during period(a) | $ 539 | $ 546
Peak interest rate | 4.95% | 0.35%
Ameren Illinois Company |  |
Short-term Debt [Line Items] |  |
Average daily amount outstanding | $ 138 | $ 118
Commercial paper issuances outstanding at period-end | $ 264 | $ 103
Weighted-average interest rate | 2.79% | 0.21%
Peak amount outstanding during period(a) | $ 404 | $ 485
Peak interest rate | 4.80% | 0.35%

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