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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
UNRECOGNIZED TAX BENEFITS |  |
Unrecognized tax benefits at beginning of year | $ 150 | $ 84
Gross increases for tax positions of current year | 2 | 15
Gross increases for tax positions of prior year | 0 | 65
Gross decreases for tax positions of prior year | (12) | 0
Change in translation of foreign currency | 3 | (2)
Lapses of statute of limitations | (3) | (8)
Settlements | (1) | (4)
Unrecognized tax benefits at end of year | 139 | 150
Interest and penalties expense (recovery) related to unrecognized tax benefits | 5 | 3
Accrued interest and penalties related to unrecognized tax benefits | $ 12 | $ 8

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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28511-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=115928272&loc=d3e28446-109314 + Details
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