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LEASES - SUPPLEMENTAL STATEMENTS OF FINANCIAL POSITION (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Leases [Abstract] |  |
Operating lease right-of-use assets, net | $ 708 | $ 713
Operating lease liabilities - current | 80 | 94
Operating lease liabilities - long-term | 681 | 689
Total operating lease liabilities | 761 | 783
Finance lease right-of-use assets, net | 124 | 89
Finance lease liabilities - current | 17 | 16
Finance lease liabilities - long-term | 98 | 78
Total finance lease liabilities | $ 115 | $ 94
Operating leases - Weighted average remaining lease term | 13 years | 13 years
Finance leases - Weighted average remaining lease term | 22 years | 23 years
Operating leases - Weighted average discount rate | 4.10% | 4.30%
Finance leases - Weighted average discount rate | 2.90% | 3.60%
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Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent | us-gaap:AccountsPayableAndOtherAccruedLiabilitiesCurrent
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