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PENSION AND OTHER POSTRETIREMENT BENEFITS | 9 Months Ended
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Sep. 30, 2019
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFITS | PENSION AND OTHER POSTRETIREMENT BENEFITS
| Three months ended September 30, |  | Nine months ended September 30,
| 2019 |  | 2018 |  |  | 2019 |  | 2018 |
(millions of Canadian dollars) |  |  |  |  |
Service cost | 50 |  | 46 |  |  | 152 |  | 162 |
Interest cost | 51 |  | 39 |  |  | 152 |  | 126 |
Expected return on plan assets | (84 | ) | (72 | ) |  | (252 | ) | (234 | )
Amortization of actuarial loss | 8 |  | 6 |  |  | 24 |  | 21 |
Plan curtailments | — |  | — |  |  | — |  | 2 |
Amortization of prior service costs | (1 | ) | — |  |  | (2 | ) | (1 | )
Net periodic benefit costs | 24 |  | 19 |  |  | 74 |  | 76 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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