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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
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%