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Postretirement benefit plans | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Postretirement benefit plans | Postretirement benefit plansExpenses related to defined benefit and retiree health care benefit plans are as follows:
| U.S. Defined Benefit |  | U.S. Retiree Health Care |  | Non-U.S. Defined Benefit
For Three Months Ended June 30, | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 6 |  |  | $ | 5 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 9 |  |  | $ | 8 |
Interest cost | 7 |  |  | 8 |  |  | 2 |  |  | 3 |  |  | 10 |  |  | 10 |
Expected return on plan assets | (9) |  |  | (9) |  |  | (3) |  |  | (3) |  |  | (21) |  |  | (20) |
Recognized net actuarial loss | 4 |  |  | 2 |  |  | — |  |  | — |  |  | 2 |  |  | 4 |
Net periodic benefit costs | 8 |  |  | 6 |  |  | — |  |  | — |  |  | — |  |  | 2 |
Settlement losses | 4 |  |  | 3 |  |  | — |  |  | — |  |  | — |  |  | — |
Total, including other postretirement losses | $ | 12 |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |
| U.S. Defined Benefit |  | U.S. Retiree Health Care |  | Non-U.S. Defined Benefit
For Six Months Ended June 30, | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 11 |  |  | $ | 9 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 18 |  |  | $ | 16 |
Interest cost | 15 |  |  | 17 |  |  | 5 |  |  | 6 |  |  | 19 |  |  | 19 |
Expected return on plan assets | (17) |  |  | (18) |  |  | (6) |  |  | (6) |  |  | (41) |  |  | (38) |
Recognized net actuarial loss | 8 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |  |  | 7 |
Net periodic benefit costs | 17 |  |  | 12 |  |  | 1 |  |  | 1 |  |  | — |  |  | 4 |
Settlement losses | 8 |  |  | 7 |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Total, including other postretirement losses | $ | 25 |  |  | $ | 19 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 5 |

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