XML 67 R32.htm IDEA: XBRL DOCUMENT
v3.24.3

Income Taxes (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2024
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, 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.

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration