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Other Income, Net
 9 Months Ended
Sep. 30, 2024
Other Nonoperating Income (Expense) [Abstract]  
OTHER INCOME, NET OTHER INCOME, NET
The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the three and nine months ended September 30, 2024 and 2023:
Three MonthsNine Months
2024202320242023
Ameren:
Allowance for equity funds used during construction
$23 $16 $48 $39 
     Interest income on industrial development revenue bonds — — — 1 
Other interest income
8 6 29 23 
Non-service cost components of net periodic benefit income(a)
76 84 228 211 
Miscellaneous income
— 1 6 4 
Earnings (losses) related to equity method investments(2)— (1)2 
Donations
(1)(1)(5)(5)
Miscellaneous expense
(3)(5)(12)(14)
Total Other Income, Net$101 $101 $293 $261 
Ameren Missouri:
Allowance for equity funds used during construction
$15 $8 $38 $20 
     Interest income on industrial development revenue bonds— — — 1 
Other interest income
2 3 7 8 
Non-service cost components of net periodic benefit income(a)
35 34 104 62 
Miscellaneous income
1 1 3 3 
Donations
— — (2)(2)
Miscellaneous expense
(2)(2)(6)(7)
Total Other Income, Net$51 $44 $144 $85 
Ameren Illinois:
Allowance for equity funds used during construction
$8 $5 $10 $15 
Other interest income7 4 22 14 
Non-service cost components of net periodic benefit income
25 31 78 93 
Miscellaneous income
— — 3 2 
Donations
— (1)(2)(3)
Miscellaneous expense(3)(2)(6)(6)
Total Other Income, Net$37 $37 $105 $115 
(a)For the three and nine months ended September 30, 2024, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $(11) million and $(31) 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. The deferral was $(2) million and $32 million, respectively, for the three and nine months ended September 30, 2023. See Note 11 – Retirement Benefits for additional information.