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RETIREMENT AND POSTRETIREMENT BENEFITS - MEDICAL COST TRENDS AND EXPECTED RATE OF RETURN AND TARGET MIX FOR PLAN ASSETS (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Effect of 1% change in assumed medical and dental care trend rate |  |
Increase in benefit obligation due to 1% increase in the assumed medical and dental care trend rate | CAD 37 |
Increase in benefit and interest cost due to 1% increase in the assumed medical and dental care trend rate | 2 |
Decrease in benefit obligation due to 1% decrease in the assumed medical and dental care trend rate | 31 |
Decrease in benefit and interest cost due to 1% decrease in the assumed medical and dental care trend rate | CAD 2 |
Expected Rate of Return on Plan Assets |  |
Expected return on plan assets (as a percent) | 0.00% | 0.00%
Pension Plans |  |
Major Categories of Plan Assets |  |
Carrying value of non-financial instruments | CAD 21 | CAD 4
Refundable tax of non-financial instruments | CAD 106 | CAD 96
Pension Plans | Equity securities |  |
Major Categories of Plan Assets |  |
Percentage of plan assets invested in readily marketable investments | 56.40% | 57.00%
Pension Plans | Fixed income securities |  |
Major Categories of Plan Assets |  |
Percentage of plan assets invested in readily marketable investments | 31.40% | 32.20%
Pension Plans | Other |  |
Major Categories of Plan Assets |  |
Percentage of plan assets invested in readily marketable investments | 12.20% | 10.80%
Other Postretirement Plans | Equity securities |  |
Major Categories of Plan Assets |  |
Percentage of plan assets invested in readily marketable investments | 59.10% | 58.80%
Other Postretirement Plans | Fixed income securities |  |
Major Categories of Plan Assets |  |
Percentage of plan assets invested in readily marketable investments | 40.00% | 40.20%
Other Postretirement Plans | Other |  |
Major Categories of Plan Assets |  |
Percentage of plan assets invested in readily marketable investments | 0.90% | 1.00%
Canadian OPEB Plans | Drugs |  |
MEDICAL COST TRENDS |  |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 6.70% |
Ultimate Medical Cost Trend Rate Assumption (as a percent) | 4.40% |
Canadian OPEB Plans | Other Medical and Dental |  |
MEDICAL COST TRENDS |  |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 4.50% |
United States OPEB Plan |  |
MEDICAL COST TRENDS |  |
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent) | 7.00% |
Ultimate Medical Cost Trend Rate Assumption (as a percent) | 4.50% |
Expected Rate of Return on Plan Assets |  |
Expected return on plan assets (as a percent) | 6.00% | 6.00%
Canadian Plans |  |
Expected Rate of Return on Plan Assets |  |
Expected return on plan assets (as a percent) | 6.70% | 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 Plan |  |
Expected Rate of Return on Plan Assets |  |
Expected return on plan assets (as a percent) | 7.20% | 7.20%
United States Plan | Equity securities |  |
Target Mix for Plan Assets |  |
Allocation of plan assets (as a percent) | 62.50% |
United States Plan | Fixed income securities |  |
Target Mix for Plan Assets |  |
Allocation of plan assets (as a percent) | 30.00% |
United States Plan | Other |  |
Target Mix for Plan Assets |  |
Allocation of plan assets (as a percent) | 7.50% |

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