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Pensions and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits
| Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020
| Pension Benefits |  | Global OPEB Plans |  | Pension Benefits |  | Global OPEB Plans
| U.S. |  | Non-U.S. |  |  | U.S. |  | Non-U.S. |
Service cost | $ | 65 |  |  | $ | 38 |  |  | $ | 4 |  |  | $ | 62 |  |  | $ | 29 |  |  | $ | 5 |
Interest cost | 269 |  |  | 59 |  |  | 31 |  |  | 429 |  |  | 91 |  |  | 43 |
Expected return on plan assets | (795) |  |  | (152) |  |  | — |  |  | (816) |  |  | (170) |  |  | — |
Amortization of prior service cost (credit) | (1) |  |  | 1 |  |  | (2) |  |  | (1) |  |  | 2 |  |  | (2) |
Amortization of net actuarial losses | 7 |  |  | 54 |  |  | 25 |  |  | 4 |  |  | 42 |  |  | 19 |
Net periodic pension and OPEB (income) expense | $ | (455) |  |  | $ | — |  |  | $ | 58 |  |  | $ | (322) |  |  | $ | (6) |  |  | $ | 65 |
The non-service cost components of net periodic pension and other postretirement benefits (OPEB) income of $483 million and $338 million in the three months ended March 31, 2021 and 2020 are presented in Interest income and other non-operating income, net.

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