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INCOME TAXES - COMPONENTS OF PRETAX EARNINGS AND COMPONENTS OF DEFERRED INCOME TAXES (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Deferred income tax liabilities    
Property, plant and equipment CAD (3,423) CAD (2,668)
Investments (3,024) (2,469)
Regulatory assets (354) (240)
Other (85) (102)
Total deferred income tax liabilities (6,886) (5,479)
Deferred income tax assets    
Financial instruments 1,374 644
Pension and OPEB plans 202 203
Loss carryforwards 848 390
Other 274 246
Total deferred income tax assets 2,698 1,483
Less valuation allowance (538) (42)
Total deferred income tax assets, net 2,160 1,441
Net deferred income tax liabilities (4,726) (4,038)
Assets    
Accounts receivable and other 367 245
Deferred income taxes 839 561
Total deferred income tax assets 1,206 806
Liabilities    
Accounts payable and other (17) (2)
Deferred income taxes (5,915) (4,842)
Total deferred income tax liabilities (5,932) (4,844)
Net deferred income tax liabilities (4,726) (4,038)
UNRECOGNIZED TAX BENEFITS    
Unrecognized tax benefits at beginning of year 51 46
Gross increases for tax positions of current year 5 5
Reduction for lapse of statute of limitations   (5)
Change in translation of foreign currency 9 5
Unrecognized tax benefits at end of year 65 51
Deferred taxes on unremitted earnings and currency translation adjustment 0 0
Foreign subsidiaries' undistributed earnings on which deferred income taxes has not been provided 4,000 4,700
Interest and penalties expense (recovery) related to unrecognized tax benefits 2 0
Accrued interest and penalties related to unrecognized tax benefits 7 5
Canada    
UNRECOGNIZED TAX BENEFITS    
Benefit of unused tax loss carryforwards recognized 1,754 826
United States    
UNRECOGNIZED TAX BENEFITS    
Benefit of unused tax loss carryforwards recognized CAD 899 CAD 394