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v3.23.1

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Income Taxes [Line Items] |  |
Federal statutory corporate income tax rate | 21.00% | 21.00%
Increases (decreases) from: |  |
Amortization of deferred investment tax credit | 0.00% | 0.00%
Amortization of excess deferred taxes | (8.00%) | (8.00%)
Renewable and other tax credits | (5.00%) | (5.00%)
State tax | 6.00% | 5.00%
Stock-based compensation | (1.00%) | (1.00%)
Other permanent items | (1.00%) | 0.00%
Effective income tax rate | 12.00% | 12.00%
Union Electric Company |  |
Income Taxes [Line Items] |  |
Federal statutory corporate income tax rate | 21.00% | 21.00%
Increases (decreases) from: |  |
Amortization of deferred investment tax credit | 0.00% | (1.00%)
Amortization of excess deferred taxes | (16.00%) | (16.00%)
Renewable and other tax credits | (10.00%) | (11.00%)
State tax | 4.00% | 3.00%
Stock-based compensation | 0.00% | 0.00%
Other permanent items | (3.00%) | 0.00%
Effective income tax rate | (4.00%) | (4.00%)
Ameren Illinois Company |  |
Income Taxes [Line Items] |  |
Federal statutory corporate income tax rate | 21.00% | 21.00%
Increases (decreases) from: |  |
Amortization of deferred investment tax credit | 0.00% | 0.00%
Amortization of excess deferred taxes | (2.00%) | (2.00%)
Renewable and other tax credits | 0.00% | 0.00%
State tax | 7.00% | 7.00%
Stock-based compensation | 0.00% | 0.00%
Other permanent items | (1.00%) | 0.00%
Effective income tax rate | 25.00% | 26.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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