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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | 9 Months Ended
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Sep. 30, 2021
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) | 2021 | 2020 |  | 2021 | 2020
Pension benefits |  |  |  |  |
Service cost | $ | 22 |  | $ | 20 |  |  | $ | 66 |  | $ | 61 |
Interest cost | 18 |  | 24 |  |  | 54 |  | 71 |
Expected return on plan assets | (36) |  | (40) |  |  | (108) |  | (121) |
Amortization of net losses and prior service costs | 23 |  | 19 |  |  | 69 |  | 57 |
Net periodic pension cost | $ | 27 |  | $ | 23 |  |  | $ | 81 |  | $ | 68 |
OPEB |  |  |  |  |
Interest cost | $ | 1 |  | $ | 2 |  |  | $ | 3 |  | $ | 4 |
Amortization of net loss and prior service credit | (2) |  | (5) |  |  | (7) |  | (13) |
Net periodic OPEB cost (income) | $ | (1) |  | $ | (3) |  |  | $ | (4) |  | $ | (9) |

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