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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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.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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The ultimate trend rate for health care costs.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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