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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
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 | (8.00%) | (9.00%) | (8.00%) | (9.00%)
Depreciation differences | 0.00% | 0.00% | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent | 1.00% | 0.00% |  |
Renewable and other tax credits | (4.00%) | (4.00%) | (5.00%) | (5.00%)
State tax | 5.00% | 5.00% | 5.00% | 5.00%
Effective income tax rate | 15.00% | 13.00% | 13.00% | 12.00%
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%) | (17.00%) | (16.00%) | (17.00%)
Depreciation differences | 0.00% | 1.00% | 0.00% | 1.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent | 0.00% | 0.00% |  |
Renewable and other tax credits | (10.00%) | (10.00%) | (10.00%) | (10.00%)
State tax | 3.00% | 3.00% | 3.00% | 3.00%
Effective income tax rate | (2.00%) | (3.00%) | (3.00%) | (3.00%)
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%) | (3.00%)
Depreciation differences | (1.00%) | 1.00% | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent | 0.00% | 0.00% |  |
Renewable and other tax credits | 0.00% | (1.00%) | 0.00% | 0.00%
State tax | 7.00% | 7.00% | 7.00% | 7.00%
Effective income tax rate | 25.00% | 26.00% | 26.00% | 25.00%

X
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