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POSTRETIREMENT BENEFIT PLANS
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
POSTRETIREMENT BENEFIT PLANS POSTRETIREMENT BENEFIT PLANS. We sponsor a number of pension and retiree health and life insurance benefit plans that we present in three categories; principal pension plans, other pension plans and principal retiree benefit plans. Please refer to Note 13 to the consolidated financial statements of our Annual Report on Form 10-K for the year ended December 31, 2024 for further information.
The components of benefit plans cost other than the service cost are included in the caption Non-operating benefit costs in our Statement of Operations.
PRINCIPAL PENSION PLANSThree months ended March 31
20252024
Service cost for benefits earned$19 $21 
Prior service cost amortization(2)3 
Expected return on plan assets(375)(578)
Interest cost on benefit obligations325 453 
Net actuarial gain amortization(128)(155)
Net periodic expense (income)$(161)$(256)
Less discontinued operations$— $(88)
Continuing operations - net periodic expense (income)$(161)$(168)

Principal retiree benefit plans income was $15 million and $36 million for the three months ended March 31, 2025 and 2024, respectively. Principal retiree benefit plans income from continuing operations was $21 million for the three months ended March 31, 2024.

Other pension plans income was $1 million and $13 million for the three months ended March 31, 2025 and 2024, respectively. Other pension plans income from continuing operations was $1 million for the three months ended March 31, 2024.
We have a defined contribution plan for eligible U.S. employees that provides employer contributions, which were $80 million and $89 million for the three months ended March 31, 2025 and 2024, respectively. Employer contributions from continuing operations was $54 million for the three months ended March 31, 2024.