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v3.23.3

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes [Line Items] |  |  |  |
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Increases (decreases) from: |  |  |  |
Amortization of deferred investment tax credit | 0.00% | 0.00% | 0.00% | 0.00%
Amortization of excess deferred taxes | (7.00%) | (8.00%) | (8.00%) | (8.00%)
Depreciation differences | (1.00%) | 0.00% | 0.00% | 0.00%
Renewable and other tax credits | (5.00%) | (4.00%) | (5.00%) | (4.00%)
State tax | 4.00% | 4.00% | 5.00% | 5.00%
Stock-based compensation | 0.00% | 1.00% |  |
Cash surrender value of COLI | 0.00% | 1.00% |  |
Effective income tax rate | 12.00% | 15.00% | 13.00% | 14.00%
Union Electric Company |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Increases (decreases) from: |  |  |  |
Amortization of deferred investment tax credit | (1.00%) | (1.00%) | (1.00%) | (1.00%)
Amortization of excess deferred taxes | (15.00%) | (15.00%) | (15.00%) | (15.00%)
Depreciation differences | 0.00% | 0.00% | 0.00% | 0.00%
Renewable and other tax credits | (11.00%) | (10.00%) | (11.00%) | (10.00%)
State tax | 3.00% | 3.00% | 3.00% | 3.00%
Stock-based compensation | 0.00% | 0.00% |  |
Cash surrender value of COLI | 0.00% | 0.00% |  |
Effective income tax rate | (3.00%) | (2.00%) | (3.00%) | (2.00%)
Ameren Illinois Company |  |  |  |
Income Taxes [Line Items] |  |  |  |
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Increases (decreases) from: |  |  |  |
Amortization of deferred investment tax credit | 0.00% | 0.00% | 0.00% | 0.00%
Amortization of excess deferred taxes | (2.00%) | (2.00%) | (2.00%) | (2.00%)
Depreciation differences | 0.00% | 0.00% | (1.00%) | 0.00%
Renewable and other tax credits | (1.00%) | 0.00% | 0.00% | 0.00%
State tax | 7.00% | 7.00% | 7.00% | 7.00%
Stock-based compensation | 0.00% | 0.00% |  |
Cash surrender value of COLI | 0.00% | 0.00% |  |
Effective income tax rate | 25.00% | 26.00% | 25.00% | 26.00%

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