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PENSION AND OTHER POSTRETIREMENT BENEFITS | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFITS | PENSION AND OTHER POSTRETIREMENT BENEFITS
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 | 2020 |  | 2021 | 2020
(millions of Canadian dollars) |  |  |  |  |
Service cost | 48 |  | 50 |  |  | 144 |  | 150 |
Interest cost | 32 |  | 44 |  |  | 96 |  | 131 |
Expected return on plan assets | (84) |  | (90) |  |  | (252) |  | (270) |
Amortization of actuarial loss and prior service costs | 14 |  | 9 |  |  | 42 |  | 28 |
Net periodic benefit costs | 10 |  | 13 |  |  | 30 |  | 39 |
For the three and nine months ended September 30, 2020, we incurred nil and $236 million in severance costs related to our voluntary workforce reduction program. For the three and nine months ended September 30, 2021, there were no such costs incurred. Severance costs are included in Operating and administrative expense in the Consolidated Statements of Earnings.

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