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Income Taxes Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2023
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 and six months ended June 30, 2023 and 2022:
| Ameren |  | Ameren Missouri |  | Ameren Illinois |
| 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
Three Months |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred investment tax credit | — |  |  | — |  |  | — |  |  | (1) |  |  | — |  |  | — |  |
Amortization of excess deferred taxes(a) | (7) |  |  | (8) |  |  | (15) |  |  | (15) |  |  | (2) |  |  | (2) |  |
Depreciation differences | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | (1) |  |
Other | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |
Renewable and other tax credits(b) | (5) |  |  | (4) |  |  | (10) |  |  | (10) |  |  | — |  |  | — |  |
State tax | 5 |  |  | 5 |  |  | 3 |  |  | 3 |  |  | 7 |  |  | 7 |  |
Effective income tax rate | 14 | % |  | 15 | % |  | (1) | % |  | (2) | % |  | 25 | % |  | 25 | % |
Six Months |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred investment tax credit | — |  |  | — |  |  | — |  |  | (1) |  |  | — |  |  | — |  |
Amortization of excess deferred taxes(a) | (8) |  |  | (8) |  |  | (15) |  |  | (16) |  |  | (2) |  |  | (2) |  |
Depreciation differences | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | — |  |
Renewable and other tax credits(b) | (4) |  |  | (5) |  |  | (10) |  |  | (10) |  |  | — |  |  | — |  |
State tax | 5 |  |  | 5 |  |  | 3 |  |  | 3 |  |  | 7 |  |  | 7 |  |
Other permanent items | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |
Effective income tax rate | 13 | % |  | 13 | % |  | (1) | % |  | (3) | % |  | 25 | % |  | 26 | % |
(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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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