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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities Resulting From Temporary Differences) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Income Taxes [Line Items]    
Plant-related $ 5,312 $ 4,940
Regulatory assets and liabilities, net (325) (385)
Deferred employee benefit costs - asset 71 27
Tax carryforwards (343) (503)
Other - liabilities 203 162
Total net accumulated deferred income tax liabilities (assets) 4,918 4,241
Accumulated deferred investment tax credits 263 233
Accumulated deferred income taxes and investment tax credits 5,181 4,474
Ameren Missouri    
Income Taxes [Line Items]    
Plant-related 2,652 2,429
Regulatory assets and liabilities, net (179) (193)
Deferred Tax Liabilities, Deferred Expense (2) (25)
Tax carryforwards (190) (355)
Other - liabilities 161 131
Total net accumulated deferred income tax liabilities (assets) 2,442 1,987
Accumulated deferred investment tax credits 260 230
Accumulated deferred income taxes and investment tax credits 2,702 2,217
Ameren Illinois    
Income Taxes [Line Items]    
Plant-related 2,416 2,250
Regulatory assets and liabilities, net (130) (170)
Deferred employee benefit costs - asset 89 77
Tax carryforwards (45) (45)
Other - liabilities 21 28
Total net accumulated deferred income tax liabilities (assets) 2,351 2,140
Accumulated deferred investment tax credits 3 3
Accumulated deferred income taxes and investment tax credits 2,354 2,143
Other    
Income Taxes [Line Items]    
Plant-related 244 261
Regulatory assets and liabilities, net (16) (22)
Deferred Tax Liabilities, Deferred Expense (16) (25)
Tax carryforwards (108) (103)
Other - liabilities 21 3
Total net accumulated deferred income tax liabilities (assets) 125 114
Accumulated deferred investment tax credits 0 0
Accumulated deferred income taxes and investment tax credits $ 125 $ 114