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Other Income, Net (Tables) | 12 Months Ended
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Dec. 31, 2025
Other Nonoperating Income (Expense) [Abstract] |
Other Income And Expenses | OTHER INCOME, NET The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the years ended December 31, 2025, 2024, and 2023:
| 2025 |  | 2024 |  | 2023 |
Ameren: |  |  |  |  |  |
Other Income, Net |  |  |  |  |  |
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(a) | 247 |  |  | 304 |  |  | 295 |  |
Miscellaneous income | 17 |  |  | 9 |  |  | 7 |  |
Gain on extinguishment of debt(b) | 8 |  |  | 16 |  |  | — |  |
Earnings (losses) related to equity method investments | (19) |  |  | (4) |  |  | 1 |  |
Donations | (12) |  |  | (5) |  |  | (24) |  |
Miscellaneous expense | (23) |  |  | (20) |  |  | (18) |  |
Total Other Income, Net | $ | 347 |  |  | $ | 417 |  |  | $ | 348 |  |
Ameren Missouri: |  |  |  |  |  |
Other Income, Net |  |  |  |  |  |
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(a) | 126 |  |  | 139 |  |  | 97 |  |
Miscellaneous income | 6 |  |  | 4 |  |  | 3 |  |
Donations | (7) |  |  | (2) |  |  | (2) |  |
Miscellaneous expense | (10) |  |  | (11) |  |  | (9) |  |
Total Other Income, Net | $ | 180 |  |  | $ | 196 |  |  | $ | 130 |  |
Ameren Illinois: |  |  |  |  |  |
Other Income, Net |  |  |  |  |  |
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 |  |
(a)For the years ended December 31, 2025, 2024, and 2023, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $(53) million, $(41) million, and $27 million, respectively, due to a regulatory tracking mechanism for the difference between the level of such costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates. See Note 10 – Retirement Benefits for additional information. (b)See Note 5 – Long-term Debt and Equity Financings for additional information on Ameren (parent)’s repurchase of Ameren Missouri’s senior secured notes and first mortgage bonds and Ameren Illinois’ first mortgage bonds that were accounted for as a debt extinguishment. The following table presents the components of “Total Other Expense, Net” in the Condensed Statement of Income and Comprehensive Income for the years ended December 31, 2025, 2024, and 2023:
(In millions) | 2025 |  | 2024 |  | 2023
Total other income (expense), net |  |  |  |  |
Non-service cost components of net periodic benefit income | $ | 1 |  |  | $ | 4 |  |  | $ | 8 |
Donations | — |  |  | — |  |  | (18) |
Other expense, net | (1) |  |  | (1) |  |  | (1) |
Total other income (expense), net | $ | — |  |  | $ | 3 |  |  | $ | (11) |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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