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POSTRETIREMENT BENEFIT PLANS
 6 Months Ended
Jun. 30, 2026
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, 2025 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 June 30Six months ended June 30
2026202520262025
Service cost for benefits earned$13 $14 $25 $33 
Prior service cost amortization(1)(3)(2)(5)
Expected return on plan assets(358)(375)(717)(750)
Interest cost on benefit obligations310 326 620 651 
Net actuarial gain amortization(110)(125)(219)(253)
Net periodic expense (income)$(146)$(163)$(293)$(324)

Principal retiree benefit plans income was $13 million and $17 million for the three months ended June 30, 2026 and 2025, and $26 million and $32 million for the six months ended June 30, 2026 and 2025, respectively.
We have a defined contribution plan for eligible U.S. employees that provides employer contributions, which were $67 million and $59 million for the three months ended June 30, 2026 and 2025, and $164 million and $139 million for the six months ended June 30, 2026 and 2025, respectively.