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Summary Of Significant Accounting Policies - Schedule of Other Assets and Other Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accounting Policies [Line Items] |  |
Other current assets | $ 162 | $ 139
Regulatory Asset, Noncurrent | 2,397 | 1,810
Long-Term Debt, Current Maturities | 317 | 849
Interest accrued | 196 | 147
Long-Term Debt, Excluding Current Maturities | 17,262 | $ 15,121
Ameren Missouri Securitization Funding I, LLC |  |
Accounting Policies [Line Items] |  |
Other current assets | 2 |
Regulatory Asset, Noncurrent | 465 |
Long-Term Debt, Current Maturities | 17 |
Interest accrued | 1 |
Long-Term Debt, Excluding Current Maturities | $ 448 |

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