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Other Income, Net
 6 Months Ended
Jun. 30, 2022
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 six months ended June 30, 2022 and 2021:
Three MonthsSix Months
2022202120222021
Ameren:
Allowance for equity funds used during construction
$11 $9 $19 $16 
Interest income on industrial development revenue bonds
6 6 12 12 
Non-service cost components of net periodic benefit income(a)
47 34 93 68 
Miscellaneous income
6 7 13 12 
Donations
(2)(1)(4)(4)
Miscellaneous expense
(6)(6)(11)(9)
Total Other Income, Net$62 $49 $122 $95 
Ameren Missouri:
Allowance for equity funds used during construction
$6 $6 $10 $10 
Interest income on industrial development revenue bonds
6 6 12 12 
Non-service cost components of net periodic benefit income(a)
14 14 28 28 
Miscellaneous income
1 — 3 1 
Donations
(1)(1)(2)(1)
Miscellaneous expense
(2)(1)(4)(3)
Total Other Income, Net$24 $24 $47 $47 
Ameren Illinois:
Allowance for equity funds used during construction
$5 $3 $9 $6 
Non-service cost components of net periodic benefit income
21 14 42 28 
Miscellaneous income
3 3 5 4 
Donations
(1)— (2)(3)
Miscellaneous expense(3)(4)(5)(5)
Total Other Income, Net$25 $16 $49 $30 
(a)For the three and six months ended June 30, 2022, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $5 million and $11 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 $(3) million for both the three and six months ended June 30, 2021. See Note 11– Retirement Benefits for additional information.