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v3.25.1

Income Taxes (Tables) | 3 Months Ended
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Mar. 31, 2025
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation | The following table presents a reconciliation of the federal statutory corporate income tax rate to the effective income tax rate for the three months ended March 31, 2025 and 2024:
| Ameren |  | Ameren Missouri |  | Ameren Illinois |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
Three Months |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of excess deferred taxes(a) | (7) |  |  | (8) |  |  | (8) |  |  | (12) |  |  | (3) |  |  | (4) |  |
Amortization of deferred investment tax credit | (1) |  |  | — |  |  | (1) |  |  | — |  |  | — |  |  | — |  |
Renewable and other tax credits(b) | (4) |  |  | (4) |  |  | (7) |  |  | (8) |  |  | — |  |  | — |  |
State tax | 6 |  |  | 6 |  |  | 4 |  |  | 4 |  |  | 7 |  |  | 7 |  |
Depreciation differences | (1) |  |  | (1) |  |  | (1) |  |  | (1) |  |  | (1) |  |  | — |  |
Stock-based compensation | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |
Other permanent items | — |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |
Effective income tax rate | 14 | % |  | 14 | % |  | 8 | % |  | 4 | % |  | 24 | % |  | 24 | % |
(a)Reflects the amortization of amounts resulting from the revaluation of deferred income taxes subject to regulatory ratemaking, which are being refunded to customers. (b)The benefit of the credits associated with Missouri renewable energy standard compliance is refunded to customers through the RESRAM. The benefit of the credits associated with the production and investment tax credit tracker will be refunded to customers based on MoPSC approval in a regulatory rate review.

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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