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Benefit Plans | 6 Months Ended
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Jun. 30, 2022
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans Components of Net Periodic Benefit (Income) Cost Net periodic benefit (income) cost consisted of the following:
| Pension |  | Postretirement |  | Pension |  | Postretirement
| For the Six Months Ended June 30, |  | For the Three Months Ended June 30,
(in millions) | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 32 |  |  | $ | 34 |  |  | $ | 10 |  |  | $ | 10 |  |  | $ | 17 |  |  | $ | 17 |  |  | $ | 5 |  |  | $ | 5 |
Interest cost | 104 |  |  | 93 |  |  | 20 |  |  | 21 |  |  | 52 |  |  | 47 |  |  | 10 |  |  | 10 |
Expected return on plan assets | (247) |  |  | (262) |  |  | (6) |  |  | (8) |  |  | (124) |  |  | (131) |  |  | (3) |  |  | (4) |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | 48 |  |  | 66 |  |  | 8 |  |  | 14 |  |  | 24 |  |  | 33 |  |  | 4 |  |  | 7 |
Prior service cost (credit) | 3 |  |  | 2 |  |  | (23) |  |  | (15) |  |  | 1 |  |  | 1 |  |  | (11) |  |  | (9) |
Net periodic benefit (income) cost | $ | (60) |  |  | $ | (67) |  |  | $ | 9 |  |  | $ | 22 |  |  | $ | (30) |  |  | $ | (33) |  |  | $ | 5 |  |  | $ | 9 |
Employer Contributions We make contributions to our pension plans to the extent that the contributions are tax deductible and pays benefits that relate to plans for salaried employees that cannot be funded under Internal Revenue Service regulations. We made employer contributions of $8 million to our pension plans and did not make any contributions to our postretirement plans during the six months ended June 30, 2022. Currently, we anticipate making additional employer contributions of up to approximately $25 million to our pension plan and $30 million to our postretirement plans in 2022. However, the foregoing estimates of 2022 contributions to our pension and postretirement plans are subject to change as a result of changes in tax and other benefit laws, changes in interest rates, as well as asset performance significantly above or below the assumed long-term rate of return for each respective plan. Plan amendments to our postretirement plans for the year ended December 31, 2021 included several plan changes announced in the second quarter of 2021 to our salaried retiree healthcare plans, primarily changing post-age 65 coverage to a private medicare marketplace. These amendments triggered a plan remeasurement in the second quarter of 2021, resulting in a reduction of $432 million (including discount rate impact and other changes) to our postretirement obligation in the second quarter of 2021 and a corresponding reduction to accumulated other comprehensive losses.

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