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Other Income, Net (Other Income And Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other Nonoperating Income (Expense) [Line Items]      
Allowance for equity funds used during construction $ 88 $ 76 $ 54
Other interest income 41 41 33
Non-service cost components of net periodic benefit income 247 304 295
Miscellaneous income 17 9 7
Gain (Loss) on Extinguishment of Debt 8 16 0
Equity in earnings of subsidiaries (19) (4) 1
Donations (12) (5) (24)
Miscellaneous expense (23) (20) (18)
Total other income, net 347 417 348
Ameren Missouri      
Other Nonoperating Income (Expense) [Line Items]      
Allowance for equity funds used during construction 56 58 30
Other interest income 9 8 11
Non-service cost components of net periodic benefit income 126 139 97
Miscellaneous income 6 4 3
Donations (7) (2) (2)
Miscellaneous expense (10) (11) (9)
Total other income, net 180 196 130
Defined Benefit Plan, Non-service Cost or Income Components - Tracker (53) (41) 27
Ameren Illinois      
Other Nonoperating Income (Expense) [Line Items]      
Allowance for equity funds used during construction 30 17 19
Other interest income 32 32 21
Non-service cost components of net periodic benefit income 81 105 124
Miscellaneous income 9 4 4
Donations (5) (3) (4)
Miscellaneous expense (11) (8) (8)
Total other income, net $ 136 $ 147 $ 156