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INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
UNRECOGNIZED TAX BENEFITS |  |
Unrecognized tax benefits at beginning of year | $ 139 | $ 150
Gross increases for tax positions of current year | 1 | 2
Gross decreases for tax positions of prior year | (1) | (12)
Change in translation of foreign currency | (4) | 3
Lapses of statute of limitations | (6) | (3)
Settlements | 0 | (1)
Unrecognized tax benefits at end of year | 129 | 139
Interest and penalties expense (recovery) related to unrecognized tax benefits | 3 | 5
Accrued interest and penalties related to unrecognized tax benefits | $ 15 | $ 12

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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