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PENSIONS AND OTHER POSTRETIREMENT BENEFITS | 3 Months Ended
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Mar. 31, 2023
Postemployment Benefits [Abstract] |
PENSIONS AND OTHER POSTRETIREMENT BENEFITS | NOTE 8 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS We offer defined benefit pension plans, defined contribution pension plans and OPEB plans to a significant portion of our employees and retirees. Benefits are also provided through multiemployer plans for certain union members. The following are the components of defined benefit pension and OPEB costs (credits): DEFINED BENEFIT PENSION COSTS (CREDITS)
|  |  | Three Months Ended March 31,
(In millions) |  |  |  |  | 2023 |  | 2022
Service cost |  |  |  |  | $ | 8 |  |  | $ | 12 |
Interest cost |  |  |  |  | 59 |  |  | 32 |
Expected return on plan assets |  |  |  |  | (79) |  |  | (92) |
Amortization: |  |  |  |  |  |  |
Prior service costs |  |  |  |  | 4 |  |  | — |
Net actuarial loss |  |  |  |  | 1 |  |  | 4 |
Net periodic benefit credits |  |  |  |  | $ | (7) |  |  | $ | (44) |
OPEB COSTS (CREDITS)
|  |  | Three Months Ended March 31,
(In millions) |  |  |  |  | 2023 |  | 2022
Service cost |  |  |  |  | $ | 2 |  |  | $ | 11 |
Interest cost |  |  |  |  | 16 |  |  | 20 |
Expected return on plan assets |  |  |  |  | (11) |  |  | (10) |
Amortization: |  |  |  |  |  |  |
Prior service credits |  |  |  |  | (4) |  |  | — |
Net actuarial gain |  |  |  |  | (36) |  |  | (3) |
Net periodic benefit costs (credits) |  |  |  |  | $ | (33) |  |  | $ | 18 |
Based on funding requirements, we made no defined benefit pension contributions for the three months ended March 31, 2023 and March 31, 2022. Based on funding requirements, we made no contributions to our voluntary employee benefit association trust plans for the three months ended March 31, 2023. We made contributions of $28 million to our voluntary employee benefit association trust plans for the three months ended March 31, 2022.

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