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RETIREMENT AND POSTRETIREMENT BENEFITS - MAJOR CATEGORIES OF PLAN ASSETS (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Level 3 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | CAD 321 | CAD 297 | CAD 132
Pension |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2,380 | 2,229 | 2,062
Pension | Cash and cash equivalents | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 47 | 37 |
Pension | Cash and cash equivalents | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 47 | 37 |
Pension | Canadian government bonds | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 137 | 131 |
Pension | Canadian government bonds | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 137 | 131 |
Pension | Corporate bonds and debentures | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 8 | 8 |
Pension | Corporate bonds and debentures | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 5 | 5 |
Pension | Corporate bonds and debentures | Level 2 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 3 | 3 |
Pension | Canadian corporate bond index fund | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 277 | 259 |
Pension | Canadian corporate bond index fund | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 277 | 259 |
Pension | Canadian government bond index fund | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 214 | 201 |
Pension | Canadian government bond index fund | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 214 | 201 |
Pension | United States debt index fund | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 111 | 102 |
Pension | United States debt index fund | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 111 | 102 |
Pension | Equity securities | Canada | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 138 | 133 |
Pension | Equity securities | Canada | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 138 | 133 |
Pension | Equity securities | United States | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2 | 2 |
Pension | Equity securities | United States | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2 | 2 |
Pension | Equity securities | Global | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 144 | 131 |
Pension | Equity securities | Global | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 114 | 106 |
Pension | Equity securities | Global | Level 2 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 30 | 25 |
Pension | Equity funds | Canada | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 287 | 253 |
Pension | Equity funds | Canada | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 287 | 253 |
Pension | Equity funds | United States | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 271 | 248 |
Pension | Equity funds | United States | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 271 | 243 |
Pension | Equity funds | United States | Level 2 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value |  | 5 |
Pension | Equity funds | Global | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 307 | 309 |
Pension | Equity funds | Global | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 167 | 161 |
Pension | Equity funds | Global | Level 2 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 140 | 148 |
Pension | Infrastructure | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 184 | 182 |
Pension | Infrastructure | Level 3 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 184 | 182 |
Pension | Real estate funds | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 137 | 115 |
Pension | Real estate funds | Level 3 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 137 | 115 |
Pension | Foreign exchange contracts | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 4 | (10) |
Pension | Foreign exchange contracts | Level 2 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 4 | (10) |
OPEB |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 115 | 115 | CAD 99
OPEB | Cash and cash equivalents | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 1 | 2 |
OPEB | Cash and cash equivalents | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 1 | 2 |
OPEB | United States government and government agency bonds | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 45 | 46 |
OPEB | United States government and government agency bonds | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 45 | 46 |
OPEB | Equity funds | United States | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 35 | 34 |
OPEB | Equity funds | United States | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 35 | 34 |
OPEB | Equity funds | Global | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 34 | 34 |
OPEB | Equity funds | Global | Level 1 | Fair Value |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | CAD 34 | CAD 34 |

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