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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
Federal statutory corporate income tax expense and rate $ 335 $ 267 $ 282
State and local taxes, net of federal income tax(a) 74 61 64
Renewable energy tax credits(b) (61) (117) (52)
Other (3) (7) (6)
Changes in valuation allowances 0 (4) 5
Nontaxable or nondeductible items (2) 1 (5)
Amortization of excess deferred income taxes(c) (107) (112) (98)
Revaluation of excess deferred income taxes(d) (86) 0 0
Depreciation differences (14) (8) (7)
Other 0 2 0
Income tax benefit $ 136 $ 83 $ 183
Effective Tax Rate      
Federal statutory corporate income tax expense and rate 21.00% 21.00% 21.00%
State and local taxes, net of federal income tax(a) 5.00% 5.00% 5.00%
Renewable energy tax credits(b) (4.00%) (9.00%) (4.00%)
Other 0.00% 0.00% 0.00%
Changes in valuation allowances 0.00% 0.00% 0.00%
Nontaxable or nondeductible items 0.00% 0.00% 0.00%
Amortization of excess deferred income taxes(c) (0.07) (0.09) (0.08)
Revaluation of excess deferred income taxes(d) (0.05) 0 0
Depreciation differences (0.01) (0.01) 0
Other 0.00% 0.00% 0.00%
Effective income tax expense and rate 9.00% 7.00% 14.00%
Increase (Decrease) in Deferred Income Taxes $ (86)    
Ameren Missouri      
Amount      
Federal statutory corporate income tax expense and rate 166 $ 100 $ 113
State and local taxes, net of federal income tax(a) 21 13 14
Renewable energy tax credits(b) (61) (113) (49)
Other (3) (4) (5)
Nontaxable or nondeductible items 1 1 (1)
Amortization of excess deferred income taxes(c) (75) (79) (80)
Depreciation differences (6) (5) 0
Income tax benefit $ 43 $ (87) $ (8)
Effective Tax Rate      
Federal statutory corporate income tax expense and rate 21.00% 21.00% 21.00%
State and local taxes, net of federal income tax(a) 3.00% 3.00% 3.00%
Renewable energy tax credits(b) (8.00%) (24.00%) (10.00%)
Other 0.00% 1.00% 1.00%
Nontaxable or nondeductible items 0.00% 0.00% 0.00%
Amortization of excess deferred income taxes(c) (0.10) (0.17) (0.15)
Depreciation differences (0.01) 0 0
Effective income tax expense and rate 5.00% (18.00%) (2.00%)
Ameren Illinois      
Amount      
Federal statutory corporate income tax expense and rate $ 187 $ 171 $ 172
State and local taxes, net of federal income tax(a) 66 62 61
Renewable energy tax credits(b) 0 (3) 0
Other (1) (2) (1)
Nontaxable or nondeductible items (1) 0 (1)
Amortization of excess deferred income taxes(c) (31) (32) (17)
Revaluation of excess deferred income taxes(d) (61) 0 0
Depreciation differences (9) (3) (5)
Other 3 0 0
Income tax benefit $ 153 $ 193 $ 209
Effective Tax Rate      
Federal statutory corporate income tax expense and rate 21.00% 21.00% 21.00%
State and local taxes, net of federal income tax(a) 7.00% 7.00% 7.00%
Renewable energy tax credits(b) 0.00% 0.00% 0.00%
Other 0.00% 0.00% 0.00%
Nontaxable or nondeductible items 0.00% 0.00% 0.00%
Amortization of excess deferred income taxes(c) (0.03) (0.04) (0.02)
Revaluation of excess deferred income taxes(d) (0.07) 0 0
Depreciation differences (0.01) 0 0
Other 0.00% 0.00% 0.00%
Effective income tax expense and rate 17.00% 24.00% 26.00%
Increase (Decrease) in Deferred Income Taxes $ (61)