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Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Taxes [Line Items]      
Current Federal taxes $ (117) $ (43) $ (47)
Current State taxes 0 (1) 1
Deferred Federal Income Tax Expense (Benefit) 269 177 260
Deferred State taxes 102 65 70
Amortization of excess deferred income taxes (107) (112) (98)
Amortization of deferred investment tax credits (11) (3) (3)
Income tax benefit 136 83 183
Ameren Missouri      
Income Taxes [Line Items]      
Current Federal taxes (140) (55) (37)
Current State taxes (2) (3) 1
Deferred Federal Income Tax Expense (Benefit) 233 45 102
Deferred State taxes 38 8 9
Amortization of excess deferred income taxes (75) (79) (80)
Amortization of deferred investment tax credits (11) (3) (3)
Income tax benefit 43 (87) (8)
Ameren Illinois      
Income Taxes [Line Items]      
Current Federal taxes 64 5 27
Current State taxes 19 0 5
Deferred Federal Income Tax Expense (Benefit) 38 144 123
Deferred State taxes 63 76 71
Amortization of excess deferred income taxes (31) (32) (17)
Amortization of deferred investment tax credits 0 0 0
Income tax benefit 153 193 209
Other      
Income Taxes [Line Items]      
Current Federal taxes (41) 7 (37)
Current State taxes (17) 2 (5)
Deferred Federal Income Tax Expense (Benefit) (2) (12) 35
Deferred State taxes 1 (19) (10)
Amortization of excess deferred income taxes (1) (1) (1)
Amortization of deferred investment tax credits 0 0 0
Income tax benefit $ (60) $ (23) $ (18)