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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Income Taxes [Line Items] |  |  |  |
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Increases (decreases) from: |  |  |  |
Amortization of excess deferred taxes | (8.00%) | (7.00%) | (8.00%) | (8.00%)
Renewable and other tax credits | (4.00%) | (5.00%) | (4.00%) | (4.00%)
State tax | 5.00% | 5.00% | 5.00% | 5.00%
Depreciation differences | (1.00%) | 0.00% | 0.00% | 0.00%
Other permanent items |  |  | 0.00% | (1.00%)
Effective income tax rate | 13.00% | 14.00% | 14.00% | 13.00%
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 excess deferred taxes | (14.00%) | (15.00%) | (14.00%) | (15.00%)
Renewable and other tax credits | (8.00%) | (10.00%) | (8.00%) | (10.00%)
State tax | 3.00% | 3.00% | 3.00% | 3.00%
Depreciation differences | (1.00%) | 0.00% | 0.00% | 0.00%
Other permanent items |  |  | 0.00% | 0.00%
Effective income tax rate | 1.00% | (1.00%) | 2.00% | (1.00%)
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 excess deferred taxes | (4.00%) | (2.00%) | (4.00%) | (2.00%)
Renewable and other tax credits | 0.00% | 0.00% | 0.00% | 0.00%
State tax | 7.00% | 7.00% | 7.00% | 7.00%
Depreciation differences | 0.00% | (1.00%) | 0.00% | (1.00%)
Other permanent items |  |  | 0.00% | 0.00%
Effective income tax rate | 24.00% | 25.00% | 24.00% | 25.00%

X
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