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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 | Dec. 31, 2013
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 | CAD 46
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 | CAD (5)
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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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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