Company: AILIM
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001002910-25-000055
Chunk: 103

Company: Ameren Illinois Co
Filing Date: 2025-02-18
Form: 10-K
Item: Item 8
Chunk 103
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 the pension and postretirement benefit costs (income). The following table presents the pension and postretirement benefit costs (income) incurred for the years ended December 31, 2024, 2023, and 2022:Pension CostsPostretirement Costs202420232022202420232022Ameren Missouri(a)$(44)$(76)$(3)$(27)$(30)$(14)Ameren Illinois(34)(62)3 (52)(54)(41)Other(6)(10)(4)— 1 1 Ameren$(84)$(148)$(4)$(79)$(83)$(54)(a)Does not include the impact of the tracker for the difference between the level of pension and postretirement benefit costs (income) incurred by Ameren Missouri under GAAP and the level of such costs included in customer rates.

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Table of Contents

The expected pension and postretirement benefit payments from qualified trust and company funds, which reflect expected future service, as of December 31, 2024, are as follows:Pension BenefitsPostretirement BenefitsPaid fromQualifiedTrust FundsPaid fromCompanyFundsPaid fromQualifiedTrust FundsPaid fromCompanyFunds2025$284 $2 $56 $3 2026289 2 57 3 2027292 2 57 4 2028295 2 57 4 2029297 2 57 4 2030 – 20341,504 13 284 18 The following table presents the assumptions used to determine net periodic benefit cost for our pension and postretirement benefit plans for the years ended December 31, 2024, 2023, and 2022:Pension BenefitsPostretirement Benefits202420232022202420232022Discount rate at measurement date5.25 %5.55 %3.00 %5.25 %5.55 %3.00 %Expected return on plan assets6.75 6.75 6.50 6.75 6.75 6.50 Increase in future compensation(a)3.50 3.50 3.50 3.50 3.50 3.50 Cash balance pension plan interest crediting rate(b)5.50 5.00 5.00 (c)(c)(c)Medical cost trend rate (initial)(