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RETIREMENT AND POSTRETIREMENT BENEFITS - CONTRIBUTIONS AND BENEFITS EXPECTED TO BE PAID (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Benefits Expected to be Paid by the Company |  |
Expected future benefit payments for 2017 | CAD 115 |
Expected future benefit payments for 2018 | 121 |
Expected future benefit payments for 2019 | 127 |
Expected future benefit payments for 2020 | 134 |
Expected future benefit payments for 2021 | 142 |
Expected future benefit payments for 2022-2026 | 829 |
Pension |  |
Pension and Other Postretirement Benefit Disclosures |  |
Total contributions by the Company | 102 | CAD 116
Contributions expected to be paid in next fiscal year | 148 |
OPEB |  |
Pension and Other Postretirement Benefit Disclosures |  |
Total contributions by the Company | 9 | CAD 10
Contributions expected to be paid in next fiscal year | CAD 2 |

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