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LEASES - Narrative (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Lessee, Lease, Description [Line Items] |  |
Operating lease, expense | $ 28 | $ 84
Operating lease, payments | $ 31 | $ 92
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, operating lease, remaining lease term |  | 3 months
Lessor, operating lease, remaining lease term |  | 1 month
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Lessee, operating lease, remaining lease term |  | 28 years
Lessor, operating lease, remaining lease term |  | 24 years

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- Definition Lessee, Operating Lease, Remaining Lease Term + References No definition available. + Details
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- Definition Lessor, Operating Lease, Remaining Lease Term + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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