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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |  |
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization of Excess Deferred Taxes, Percent | (9.00%) | (8.00%) | (8.00%)
Amortization of deferred investment tax credit | 0.00% | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | (9.00%) | (4.00%) | (4.00%)
State tax | 5.00% | 5.00% | 5.00%
Depreciation differences | (1.00%) |  |
Effective income tax rate | 7.00% | 14.00% | 14.00%
Ameren Missouri |  |  |
Income Taxes [Line Items] |  |  |
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization of Excess Deferred Taxes, Percent | (17.00%) | (15.00%) | (15.00%)
Amortization of deferred investment tax credit | (1.00%) | (1.00%) | (1.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | (24.00%) | (10.00%) | (10.00%)
State tax | 3.00% | 3.00% | 3.00%
Depreciation differences | 0.00% |  |
Effective income tax rate | (18.00%) | (2.00%) | (2.00%)
Ameren Illinois |  |  |
Income Taxes [Line Items] |  |  |
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization of Excess Deferred Taxes, Percent | (4.00%) | (2.00%) | (2.00%)
Amortization of deferred investment tax credit | 0.00% | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | 0.00% | 0.00% | 0.00%
State tax | 7.00% | 7.00% | 7.00%
Depreciation differences | 0.00% |  |
Effective income tax rate | 24.00% | 26.00% | 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 -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 Reference 2: 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 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(5) -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 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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