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LEASES (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Lessee, Lease, Description1 [Line Items] |  |
Variable lease payments | $ 23 | $ 22
Right-of-use assets securing lease liabilities | 240 | 114
Lease Liability Activity [Roll Forward] |  |
Lease liabilities, beginning of year | 1,725 | 1,545
Net additions | 320 | 335
Interest expense on lease liabilities | 70 | 61
Interest payments on lease liabilities | (67) | (49)
Principal payments of lease liabilities | (213) | (167)
Lease liabilities, end of year | 1,835 | 1,725
Current liability | 278 | 230
Long-term liability | $ 1,557 | $ 1,495
Minimum |  |
Lessee, Lease, Description1 [Line Items] |  |
Non-cancellable contract periods for leases, typical range | 5 years |
Maximum |  |
Lessee, Lease, Description1 [Line Items] |  |
Non-cancellable contract periods for leases, typical range | 15 years |

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Additions to Lease Liabilities + References No definition available. + Details
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- Definition Lease Liability Activity [Roll Forward] + References No definition available. + Details
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- Definition Leases, Term of Contract + References No definition available. + Details
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- Definition [Line Items] for Lessee, Lease, Description1 [Table] + References No definition available. + Details
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- Definition Payments of Lease Liabilities, Classified as Financing Activities, Interest Payment on Liability + References No definition available. + Details
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- Definition Payments of Lease Liabilities, Classified as Financing Activities, Principal Payments + References No definition available. + Details
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- Definition Right-of-use Assets Securing Lease Liabilities + References No definition available. + Details
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- Details
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- Details
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