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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Aug. 16, 2022
Income Taxes [Line Items] |  |
Increase (Decrease) In Deferred Tax Liabilities | $ 123 |
Ameren Missouri |  |
Income Taxes [Line Items] |  |
Increase (Decrease) In Deferred Tax Liabilities | 12 |
Ameren Illinois |  |
Income Taxes [Line Items] |  |
Increase (Decrease) In Deferred Tax Liabilities | $ 111 |
Federal |  |
Income Taxes [Line Items] |  |
Production and Investment Tax Credit Adder |  | 10.00%
Greenhouse Emissions Reduction Target, Inflation Reduction Act |  | 75.00%
Eligible Transfer of Tax Credits, Inflation Reduction Act |  | 100.00%
Minimum Tax on Book Income, Inflation Reduction Act, Percent |  | 15.00%
Minimum Adjusted Financial Statement Income Subject to Inflation Reduction Act Tax |  | $ 1,000

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