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Pensions and Other Postretirement Benefits | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits
| Three Months Ended September 30, 2020 |  | Three Months Ended September 30, 2019
| Pension Benefits |  | Global OPEB Plans |  | Pension Benefits |  | Global OPEB Plans
| U.S. |  | Non-U.S. |  |  | U.S. |  | Non-U.S. |
Service cost | $ | 63 |  |  | $ | 41 |  |  | $ | 5 |  |  | $ | 99 |  |  | $ | 38 |  |  | $ | 4 |
Interest cost | 429 |  |  | 92 |  |  | 43 |  |  | 566 |  |  | 148 |  |  | 54 |
Expected return on plan assets | (816) |  |  | (174) |  |  | — |  |  | (871) |  |  | (240) |  |  | — |
Amortization of prior service cost (credit) | (1) |  |  | 2 |  |  | (1) |  |  | (1) |  |  | 2 |  |  | (3) |
Amortization of net actuarial losses | 4 |  |  | 44 |  |  | 18 |  |  | 2 |  |  | 31 |  |  | 7 |
Curtailments, settlements and other | — |  |  | 15 |  |  | — |  |  | — |  |  | 119 |  |  | — |
Net periodic pension and OPEB (income) expense | $ | (321) |  |  | $ | 20 |  |  | $ | 65 |  |  | $ | (205) |  |  | $ | 98 |  |  | $ | 62 |
| Nine Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2019
| Pension Benefits |  | Global OPEB Plans |  | Pension Benefits |  | Global OPEB Plans
| U.S. |  | Non-U.S. |  |  | U.S. |  | Non-U.S. |
Service cost | $ | 188 |  |  | $ | 107 |  |  | $ | 14 |  |  | $ | 295 |  |  | $ | 102 |  |  | $ | 12 |
Interest cost | 1,287 |  |  | 271 |  |  | 130 |  |  | 1,698 |  |  | 386 |  |  | 163 |
Expected return on plan assets | (2,449) |  |  | (507) |  |  | — |  |  | (2,610) |  |  | (627) |  |  | — |
Amortization of prior service cost (credit) | (3) |  |  | 5 |  |  | (5) |  |  | (3) |  |  | 4 |  |  | (10) |
Amortization of net actuarial losses | 12 |  |  | 126 |  |  | 55 |  |  | 8 |  |  | 90 |  |  | 22 |
Curtailments, settlements and other | — |  |  | 15 |  |  | — |  |  | — |  |  | 119 |  |  | — |
Net periodic pension and OPEB (income) expense | $ | (965) |  |  | $ | 17 |  |  | $ | 194 |  |  | $ | (612) |  |  | $ | 74 |  |  | $ | 187 |
The curtailment and other charges in the three and nine months ended September 30, 2019 were primarily due to remeasurement of the General Motors Canada Company hourly pension plan as a result of transformation activities. Refer to Note 17 for additional information on transformation-related charges. The non-service cost components of net periodic pension and other postretirement benefits (OPEB) income of $322 million and $125 million in the three months ended September 30, 2020 and 2019 an d $996 million and $587 million in the nine months ended September 30, 2020 and 2019 are presented in Interest income and other non-operating income, net.

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