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POSTRETIREMENT BENEFIT PLANS | 6 Months Ended
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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 PLANS | Three months ended June 30 |  | Six months ended June 30
| 2026 | 2025 |  | 2026 | 2025
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 obligations | 310 |  | 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.

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