SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (CAD) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 item	Dec. 31, 2012
RETIREMENT AND POSTRETIREMENT BENEFITS
Percentage by which if, amortization of cumulative unrecognized net actuarial gains and losses exceeds the greater of the accrued benefit obligation or the fair value of plan assets, then the incremental amortization of cumulative unrecognized net actuarial gains and losses would be included in pension cost		10.00%
REGULATION
Regulatory assets	0us-gaap_RegulatoryAssets
PROPERTY, PLANT AND EQUIPMENT
Number of primary methods of depreciation which are utilized	2
Performance stock units
STOCK-BASED COMPENSATION
Vesting period	3 years
Restricted stock units
STOCK-BASED COMPENSATION
Vesting period	35 months

Represents the percentage by which if, amortization of cumulative unrecognized net actuarial gains and losses exceeds the greater of the accrued benefit obligation or the fair value of plan assets, then the incremental amortization of cumulative unrecognized net actuarial gains and losses would be included in pension cost.

No definition available.

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- Definition

Represents the number of primary methods of depreciation which are utilized.

+ References

No definition available.

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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