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COMMITMENTS AND CONTINGENT LIABILITIES - Other (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Rent expense on operating lease $ 228 $ 228
Acquisition of property, plant and equipment 244  
Acquisition of intangible assets 183  
Commitments related to associates and joint ventures 383  
Total other commitments $ 810  
Minimum    
Disclosure of finance lease and operating lease by lessee [line items]    
Term of operating lease 5 years  
Maximum    
Disclosure of finance lease and operating lease by lessee [line items]    
Term of operating lease 15 years