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Other Income, Net (Tables)
 3 Months Ended
Mar. 31, 2025
Other Nonoperating Income (Expense) [Abstract]  
Other Income And Expenses
The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the three months ended March 31, 2025 and 2024:
Three Months
20252024
Ameren:
Allowance for equity funds used during construction
$16 $9 
Other interest income
11 8 
Non-service cost components of net periodic benefit income(a)
66 76 
Miscellaneous income
3 2 
Earnings (losses) related to equity method investments(4)— 
Donations
(2)(2)
Miscellaneous expense
(5)(4)
Total Other Income, Net$85 $89 
Ameren Missouri:
Allowance for equity funds used during construction
$8 $9 
Other interest income
2 2 
Non-service cost components of net periodic benefit income(a)
35 35 
Miscellaneous income
1 1 
Donations
(1)(1)
Miscellaneous expense
(2)(2)
Total Other Income, Net$43 $44 
Ameren Illinois:
Allowance for equity funds used during construction
$7 $— 
Other interest income9 6 
Non-service cost components of net periodic benefit income
20 27 
Miscellaneous income
2 1 
Donations
(1)(1)
Miscellaneous expense(3)(2)
Total Other Income, Net$34 $31 
(a)For the three months ended March 31, 2025 and 2024, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $(16) million and $(9) 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 11 – Retirement Benefits for additional information.