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v3.22.2.2

Income Taxes Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2022
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 nine months ended September 30, 2022 and 2021:
| Ameren |  | Ameren Missouri |  | Ameren Illinois |
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Three Months |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory corporate income tax rate | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |  | 21 | % |
Increases (decreases) from: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred investment tax credit | — |  |  | (1) |  |  | (1) |  |  | (1) |  |  | — |  |  | — |  |
Amortization of excess deferred taxes(a) | (8) |  |  | (8) |  |  | (15) |  |  | (17) |  |  | (2) |  |  | (2) |  |
Depreciation differences | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1) |  |
Renewable and other tax credits(b) | (4) |  |  | (2) |  |  | (10) |  |  | (8) |  |  | — |  |  | — |  |
State tax | 4 |  |  | 4 |  |  | 3 |  |  | 4 |  |  | 7 |  |  | 7 |  |
Stock-based compensation | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |
Cash surrender value of COLI | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |
Effective income tax rate | 15 | % |  | 14 | % |  | (2) | % |  | (1) | % |  | 26 | % |  | 25 | % |
Nine 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) |  |  | (9) |  |  | (15) |  |  | (17) |  |  | (2) |  |  | (3) |  |
Renewable and other tax credits(b) | (4) |  |  | (3) |  |  | (10) |  |  | (8) |  |  | — |  |  | — |  |
State tax | 5 |  |  | 5 |  |  | 3 |  |  | 3 |  |  | 7 |  |  | 7 |  |
Stock-based compensation | — |  |  | (1) |  |  | — |  |  | — |  |  | — |  |  | — |  |
Effective income tax rate | 14 | % |  | 13 | % |  | (2) | % |  | (1) | % |  | 26 | % |  | 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)Includes credits associated with the High Prairie and Atchison renewable energy centers. Ameren Missouri placed the High Prairie Renewable Energy Center in service in December 2020. Additionally, Ameren Missouri placed in service the wind turbines at its Atchison Renewable Energy Center throughout the first half of 2021. 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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