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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 | (8.00%) | (8.00%) | (9.00%)
Amortization of deferred investment tax credit | 0.00% | 0.00% | (1.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | (4.00%) | (3.00%) |
State tax | 5.00% | 5.00% | 5.00%
Stock-based compensation |  | (1.00%) | (1.00%)
Effective income tax rate | 14.00% | 14.00% | 15.00%
Union Electric Company |  |  |
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 | (15.00%) | (15.00%) | (16.00%)
Amortization of deferred investment tax credit | (1.00%) | (1.00%) | (1.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | (10.00%) | (7.00%) |
State tax | 3.00% | 3.00% | 3.00%
Stock-based compensation |  | 0.00% | 0.00%
Effective income tax rate | (2.00%) | 1.00% | 7.00%
Ameren Illinois Company |  |  |
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 | (2.00%) | (3.00%) | (3.00%)
Amortization of deferred investment tax credit | 0.00% | 0.00% | (1.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent | 0.00% | 0.00% |
State tax | 7.00% | 7.00% | 7.00%
Stock-based compensation |  | 0.00% | 0.00%
Effective income tax rate | 26.00% | 25.00% | 24.00%

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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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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120384911&loc=d3e23163-113944 + Details
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