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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

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