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PENSION AND OTHER POSTRETIREMENT BENEFITS | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFITS | PENSION AND OTHER POSTRETIREMENT BENEFITS
| Three months ended March 31,
| 2018 |  | 2017 |
(millions of Canadian dollars) |  |
Service cost | 65 |  | 54 |
Interest cost | 45 |  | 32 |
Expected return on plan assets | (82 | ) | (51 | )
Amortization of prior service costs | (1 | ) | — |
Amortization of actuarial loss | 7 |  | 9 |
Net periodic benefit costs | 34 |  | 44 |

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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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