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Other Income, Net
 12 Months Ended
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:
202520242023
Ameren:
Other Income, Net
Allowance for equity funds used during construction$88 $76 $54 
Other interest income41 41 33 
Non-service cost components of net periodic benefit income(a)
247 304 295 
Miscellaneous income17 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 income9 8 11 
Non-service cost components of net periodic benefit income(a)
126 139 97 
Miscellaneous income6 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 income32 32 21 
Non-service cost components of net periodic benefit income81 105 124 
Miscellaneous income9 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.