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ACCOUNTING STANDARDS ISSUED BUT NOT YET APPLIED - Narrative (Details) - Adjustment on adoption of IFRS 16
$ in Billions
Jan. 01, 2019
CAD ($)
Bottom of range  
Disclosure of finance lease and operating lease by lessee [line items]  
Right-of-use assets $ 1.5
Lease liabilities 1.5
Top of range  
Disclosure of finance lease and operating lease by lessee [line items]  
Right-of-use assets 1.6
Lease liabilities $ 1.6