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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMSThe 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) | 2023 | 2022 |  | 2023 | 2022
Pension benefits |  |  |  |  |
Service cost | $ | 7 |  | $ | 21 |  |  | $ | 13 |  | $ | 40 |
Interest cost | 35 |  | 24 |  |  | 72 |  | 48 |
Expected return on plan assets | (43) |  | (40) |  |  | (87) |  | (79) |
Amortization of net losses and prior service costs | 1 |  | 11 |  |  | 2 |  | 23 |
Net periodic pension cost | $ | — |  | $ | 16 |  |  | $ | — |  | $ | 32 |
OPEB |  |  |  |  |
Interest cost | $ | 2 |  | $ | 1 |  |  | $ | 4 |  | $ | 2 |
Amortization of net loss and prior service credit | (6) |  | (3) |  |  | (12) |  | (6) |
Net periodic OPEB cost (income) | $ | (4) |  | $ | (2) |  |  | $ | (8) |  | $ | (4) |

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