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PENSION AND OTHER POSTRETIREMENT BENEFITS | 6 Months Ended
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Jun. 30, 2020
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFITS | PENSION AND OTHER POSTRETIREMENT BENEFITS
| Three months ended June 30, |  | Six months ended June 30,
| 2020 |  | 2019 |  |  | 2020 |  | 2019 |
(millions of Canadian dollars) |  |  |  |  |
Service cost | 58 |  | 51 |  |  | 100 |  | 102 |
Interest cost | 54 |  | 50 |  |  | 87 |  | 101 |
Expected return on plan assets | (113 | ) | (84 | ) |  | (180 | ) | (168 | )
Amortization of actuarial loss and prior service costs | 10 |  | 8 |  |  | 19 |  | 15 |
Net periodic benefit costs | 9 |  | 25 |  |  | 26 |  | 50 |
For the three and six months ended June 30, 2020, we incurred $236 million in severance costs related to our voluntary workforce reduction program. Severance costs are included in Operating and administrative expense in the Consolidated Statements of Earnings.

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