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RETIREMENT AND POSTRETIREMENT BENEFITS - EXPECTED RATE OF RETURN AND TARGET MIX FOR PLAN ASSETS (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Canadian Pension Plans |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Expected rate of return on plan assets (as a percent) | 6.60% | 6.70% |
Liquids Pipelines Plan | Equity securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 62.50% |  |
Liquids Pipelines Plan | Fixed income securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 30.00% |  |
Liquids Pipelines Plan | Other |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 7.50% |  |
Gas Distribution Plan | Equity securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 53.50% |  |
Gas Distribution Plan | Fixed income securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 40.00% |  |
Gas Distribution Plan | Other |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 6.50% |  |
United States Pension Plan |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Expected rate of return on plan assets (as a percent) | 7.20% | 7.20% |
United States Pension Plan | Equity securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 62.50% |  |
United States Pension Plan | Fixed income securities |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 30.00% |  |
United States Pension Plan | Other |  |  |
Target Mix for Plan Assets |  |  |
Allocation of plan assets (as a percent) | 7.50% |  |
United States OPEB Plan |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Expected rate of return on plan assets (as a percent) | 6.00% | 6.00% |
Pension |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Expected rate of return on plan assets (as a percent) | 6.60% | 6.70% | 6.70%
Major Categories of Plan Assets |  |  |
Carrying value of non-financial instruments | CAD 7 | CAD 21 |
Refundable tax of non-financial instruments | CAD 105 | CAD 106 |
Pension | Equity securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 48.30% | 56.40% |
Pension | Fixed income securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 31.40% | 31.40% |
Pension | Other |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 20.30% | 12.20% |
OPEB |  |  |
Pension and Other Postretirement Benefit Disclosures |  |  |
Expected rate of return on plan assets (as a percent) | 6.00% | 6.00% | 6.00%
OPEB | Equity securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 60.00% | 59.10% |
OPEB | Fixed income securities |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 39.10% | 40.00% |
OPEB | Other |  |  |
Major Categories of Plan Assets |  |  |
Percentage of plan assets invested in readily marketable investments | 0.90% | 0.90% |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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