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POSTRETIREMENT BENEFIT PLANS
 9 Months Ended
Sep. 30, 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 September 30Nine months ended September 30
2025202420252024
Service cost for benefits earned$14 $16 $47 $53 
Prior service cost amortization(2)1 (7)5 
Expected return on plan assets(375)(392)(1,125)(1,360)
Interest cost on benefit obligations325 317 976 1,085 
Net actuarial gain amortization(126)(105)(379)(362)
Net periodic expense (income)$(164)$(163)$(488)$(579)
Less discontinued operations$— $— $— $(88)
Continuing operations - net periodic expense (income)$(164)$(163)$(488)$(491)

Principal retiree benefit plans income was $17 million and $22 million for the three months ended September 30, 2025 and 2024, and $49 million and $79 million for the nine months ended September 30, 2025 and 2024, respectively. Principal retiree benefit plans income from continuing operations was $22 million and $65 million for the three and nine months ended September 30, 2024, respectively.

We have a defined contribution plan for eligible U.S. employees that provides employer contributions, which were $55 million and $47 million for the three months ended September 30, 2025 and 2024, and $194 million and $210 million for the nine months ended September 30, 2025 and 2024, respectively. Employer contributions from continuing operations were $47 million and $175 million for the three and nine months ended September 30, 2024, respectively.