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Income Taxes | 9 Months Ended
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Sep. 30, 2024
Income Tax Disclosure [Abstract] |
Income Taxes | INCOME TAXES The following table presents a reconciliation of the federal statutory corporate income tax rate to the effective income tax rate for the three and nine months ended September 30, 2024 and 2023:
| Ameren |  | Ameren Missouri |  | Ameren Illinois |
| 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023 |
Three Months |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of excess deferred taxes(a) | (9) |  |  | (7) |  |  | (15) |  |  | (15) |  |  | (4) |  |  | (2) |  |
Amortization of deferred investment tax credit | — |  |  | — |  |  | — |  |  | (1) |  |  | — |  |  | — |  |
Renewable and other tax credits(b) | (4) |  |  | (5) |  |  | (10) |  |  | (11) |  |  | — |  |  | (1) |  |
State tax | 4 |  |  | 4 |  |  | 3 |  |  | 3 |  |  | 7 |  |  | 7 |  |
Depreciation differences | — |  |  | (1) |  |  | (1) |  |  | — |  |  | — |  |  | — |  |
Other permanent items | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |
Effective income tax rate | 11 | % |  | 12 | % |  | (2) | % |  | (3) | % |  | 24 | % |  | 25 | % |
Nine Months |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of excess deferred taxes(a) | (8) |  |  | (8) |  |  | (14) |  |  | (15) |  |  | (4) |  |  | (2) |  |
Amortization of deferred investment tax credit | — |  |  | — |  |  | — |  |  | (1) |  |  | — |  |  | — |  |
Renewable and other tax credits(b) | (5) |  |  | (5) |  |  | (10) |  |  | (11) |  |  | — |  |  | — |  |
State tax | 5 |  |  | 5 |  |  | 3 |  |  | 3 |  |  | 7 |  |  | 7 |  |
Depreciation differences | — |  |  | — |  |  | (1) |  |  | — |  |  | — |  |  | (1) |  |
Effective income tax rate | 13 | % |  | 13 | % |  | (1) | % |  | (3) | % |  | 24 | % |  | 25 | % |
(a)Reflects the amortization of amounts resulting from the revaluation of deferred income taxes subject to regulatory ratemaking, which are being refunded to customers. Deferred income taxes are revalued when federal or state income tax rates change, and the offset to the revaluation of deferred income taxes subject to regulatory ratemaking is recorded to a regulatory asset or liability. (b)The benefit of the credits associated with Missouri renewable energy standard compliance is refunded to customers through the RESRAM.

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