8. EMPLOYEE BENEFIT PLANS
The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions): | | | | | | | | | | | | | | | | | | | | | | | | | Pension Plans | | Other Postretirement
Benefit Plans | | 2026 | | 2025 | | 2026 | | 2025 | | Three months ended June 30 | | | | | | | | | Service cost | $ | 27 | | | $ | 27 | | | $ | 1 | | | $ | 1 | | | Interest cost | 33 | | | 34 | | | 2 | | | 3 | | | Expected return on plan assets | (57) | | | (56) | | | — | | | — | | | Amortization of: | | | | | | | | | Net actuarial gain | (2) | | | (2) | | | (1) | | | (2) | | | Prior service cost | 1 | | | 1 | | | — | | | — | | | Settlement loss | — | | | 2 | | | — | | | — | | | Net periodic benefit cost | $ | 2 | | | $ | 6 | | | $ | 2 | | | $ | 2 | | | | | | | | | | | Six months ended June 30 | | | | | | | | | Service cost | $ | 54 | | | $ | 54 | | | $ | 2 | | | $ | 2 | | | Interest cost | 65 | | | 68 | | | 5 | | | 6 | | | Expected return on plan assets | (115) | | | (111) | | | — | | | — | | | Amortization of: | | | | | | | | | Net actuarial gain | (4) | | | (4) | | | (3) | | | (4) | | | Prior service cost | 3 | | | 3 | | | — | | | — | | | Settlement loss | 1 | | | 3 | | | — | | | — | | | Net periodic benefit cost | $ | 4 | | | $ | 13 | | | $ | 4 | | | $ | 4 | |
The components of net periodic benefit cost other than the service cost component (i.e., the non-service cost components) are included in “other income, net.”
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