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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | 3 Months Ended
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Mar. 31, 2022
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 March 31, |  |
(in millions) | 2022 | 2021 |  |  |
Pension benefits |  |  |  |  |
Service cost | $ | 19 |  | $ | 22 |  |  |  |
Interest cost | 24 |  | 18 |  |  |  |
Expected return on plan assets | (39) |  | (36) |  |  |  |
Amortization of net losses and prior service costs | 12 |  | 23 |  |  |  |
Net periodic pension cost | $ | 16 |  | $ | 27 |  |  |  |
OPEB |  |  |  |  |
Interest cost | $ | 1 |  | $ | 1 |  |  |  |
Amortization of net loss and prior service credit | (3) |  | (2) |  |  |  |
Net periodic OPEB cost (income) | $ | (2) |  | $ | (1) |  |  |  |

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