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Other Income, Net
 12 Months Ended
Dec. 31, 2023
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, 2023, 2022, and 2021:
202320222021
Ameren:
Other Income, Net
Allowance for equity funds used during construction$54 $43 $43 
Interest income on industrial development revenue bonds1 24 25 
Other interest income32 11 2 
Non-service cost components of net periodic benefit income(a)
295 184 136 
Miscellaneous income7 10 10 
Earnings related to equity method investments1 2 12 
Donations(24)(26)(9)
Miscellaneous expense(18)(22)(17)
Total Other Income, Net$348 $226 $202 
Ameren Missouri:
Other Income, Net
Allowance for equity funds used during construction$30 $24 $26 
Interest income on industrial development revenue bonds1 24 25 
Other interest income10 4 1 
Non-service cost components of net periodic benefit income(a)
97 55 55 
Miscellaneous income3 4 3 
Donations(2)(3)

(4)
Miscellaneous expense(9)(9)(7)
Total Other Income, Net$130 $99 $99 
Ameren Illinois:
Other Income, Net
Allowance for equity funds used during construction$19 $18 $17 
Interest income21 7 1 
Non-service cost components of net periodic benefit income124 84 55 
Miscellaneous income4 5 6 
Donations(4)(8)(5)
Miscellaneous expense(8)(10)(8)
Total Other Income, Net$156 $96 $66 
(a)For the years ended December 31, 2023, 2022, and 2021, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $27 million, $22 million, and $(7) 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.