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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

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