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PENSION AND OTHER POSTRETIREMENT BENEFITS | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFITS | PENSION AND OTHER POSTRETIREMENT BENEFITS
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  |  | 2018 |  | 2017 |
(millions of Canadian dollars) |  |  |  |  |
Service cost | 51 |  | 62 |  |  | 116 |  | 116 |
Interest cost | 42 |  | 47 |  |  | 87 |  | 79 |
Expected return on plan assets | (80 | ) | (73 | ) |  | (162 | ) | (124 | )
Amortization of actuarial loss | 8 |  | 8 |  |  | 15 |  | 17 |
Plan curtailments | 2 |  | — |  |  | 2 |  | — |
Amortization of prior service costs | — |  | — |  |  | (1 | ) | — |
Net periodic benefit costs | 23 |  | 44 |  |  | 57 |  | 88 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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