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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | 9 Months Ended
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Sep. 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 September 30, |  | Nine months ended September 30,
(in millions) | 2023 | 2022 |  | 2023 | 2022
Pension benefits |  |  |  |  |
Service cost | $ | 7 |  | $ | 19 |  |  | $ | 20 |  | $ | 59 |
Interest cost | 36 |  | 25 |  |  | 108 |  | 73 |
Expected return on plan assets | (44) |  | (39) |  |  | (131) |  | (118) |
Amortization of net losses and prior service costs | 1 |  | 10 |  |  | 3 |  | 33 |
Net periodic pension cost | $ | — |  | $ | 15 |  |  | $ | — |  | $ | 47 |
OPEB |  |  |  |  |
Interest cost | $ | 2 |  | $ | 1 |  |  | $ | 6 |  | $ | 3 |
Amortization of net loss and prior service credit | (6) |  | (3) |  |  | (18) |  | (9) |
Net periodic OPEB cost (income) | $ | (4) |  | $ | (2) |  |  | $ | (12) |  | $ | (6) |

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