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RETIREMENT AND POSTRETIREMENT BENEFITS - MAJOR CATEGORIES OF PLAN ASSETS (Details) - CAD CAD in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Level 3 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | CAD 297 | CAD 132 | CAD 126
Pension Plans |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2,229 | 2,062 | 1,799
Pension Plans | Cash and cash equivalents | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 37 | 42 |
Pension Plans | Cash and cash equivalents | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 37 | 42 |
Pension Plans | Canadian government bonds | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 131 | 121 |
Pension Plans | Canadian government bonds | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 131 | 121 |
Pension Plans | Corporate bonds and debentures | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 8 | 8 |
Pension Plans | Corporate bonds and debentures | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 5 | 4 |
Pension Plans | Corporate bonds and debentures | Level 2 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 3 | 4 |
Pension Plans | Canadian corporate bond index fund | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 259 | 254 |
Pension Plans | Canadian corporate bond index fund | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 259 | 254 |
Pension Plans | Canadian government bond index fund | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 201 | 198 |
Pension Plans | Canadian government bond index fund | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 201 | 198 |
Pension Plans | United States debt index fund | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 102 | 84 |
Pension Plans | United States debt index fund | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 102 | 84 |
Pension Plans | Equity securities | Canada | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 133 | 131 |
Pension Plans | Equity securities | Canada | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 133 | 131 |
Pension Plans | Equity securities | United States | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2 | 31 |
Pension Plans | Equity securities | United States | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2 | 31 |
Pension Plans | Equity securities | Global | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 131 | 11 |
Pension Plans | Equity securities | Global | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 106 | 11 |
Pension Plans | Equity securities | Global | Level 2 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 25 |  |
Pension Plans | Equity funds | Canada | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 253 | 255 |
Pension Plans | Equity funds | Canada | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 253 | 255 |
Pension Plans | Equity funds | United States | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 248 | 221 |
Pension Plans | Equity funds | United States | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 243 | 185 |
Pension Plans | Equity funds | United States | Level 2 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 5 | 36 |
Pension Plans | Equity funds | Global | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 309 | 476 |
Pension Plans | Equity funds | Global | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 161 | 342 |
Pension Plans | Equity funds | Global | Level 2 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 148 | 134 |
Pension Plans | Infrastructure | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 182 | 51 |
Pension Plans | Infrastructure | Level 3 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 182 | 51 |
Pension Plans | Real estate funds | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 115 | 81 |
Pension Plans | Real estate funds | Level 3 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 115 | 81 |
Pension Plans | Foreign Exchange Risk | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | (10) | (1) |
Pension Plans | Foreign Exchange Risk | Level 2 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | (10) | (1) |
Other Postretirement Plans |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 115 | 99 | CAD 81
Other Postretirement Plans | Cash and cash equivalents | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2 | 1 |
Other Postretirement Plans | Cash and cash equivalents | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 2 | 1 |
Other Postretirement Plans | United States government and government agency bonds | United States | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 46 | 39 |
Other Postretirement Plans | United States government and government agency bonds | United States | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 46 | 39 |
Other Postretirement Plans | Equity funds | United States | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 34 | 30 |
Other Postretirement Plans | Equity funds | United States | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 34 | 30 |
Other Postretirement Plans | Equity funds | Global | Total Gross Derivative Instruments |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | 34 | 27 |
Other Postretirement Plans | Equity funds | Global | Level 1 |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Financial instruments at fair value | CAD 34 | CAD 27 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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