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PENSION AND OTHER POSTRETIREMENT BENEFITS | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFITS | PENSION AND OTHER POSTRETIREMENT BENEFITS
| Three months ended September 30, |  | Nine months ended September 30,
| 2020 | 2019 |  | 2020 | 2019
(millions of Canadian dollars) |  |  |  |  |
Service cost | 50 |  | 50 |  |  | 150 |  | 152 |
Interest cost | 44 |  | 51 |  |  | 131 |  | 152 |
Expected return on plan assets | (90) |  | (84) |  |  | (270) |  | (252) |
Amortization of actuarial loss and prior service costs | 9 |  | 7 |  |  | 28 |  | 22 |
Net periodic benefit costs | 13 |  | 24 |  |  | 39 |  | 74 |
During the nine months ended September 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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