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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS The following is a summary of net periodic benefit cost relating to our pension and OPEB plans.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2024 | 2023 |  | 2024 | 2023
Pension benefits |  |  |  |  |
Service cost | $ | 4 |  | $ | 7 |  |  | $ | 11 |  | $ | 13 |
Interest cost | 38 |  | 35 |  |  | 76 |  | 72 |
Expected return on plan assets | (49) |  | (43) |  |  | (99) |  | (87) |
Amortization of net losses and prior service costs | 4 |  | 1 |  |  | 7 |  | 2 |
Net periodic pension cost | $ | (3) |  | $ | — |  |  | $ | (5) |  | $ | — |
OPEB |  |  |  |  |
Interest cost | $ | 2 |  | $ | 2 |  |  | $ | 4 |  | $ | 4 |
Amortization of net loss and prior service credit | (5) |  | (6) |  |  | (10) |  | (12) |
Net periodic OPEB cost (income) | $ | (3) |  | $ | (4) |  |  | $ | (6) |  | $ | (8) |

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