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FINANCE COSTS (Details)
$ in Millions, $ in Billions
12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2018
USD ($)
Finance Costs [Abstract]      
Interest on borrowings $ 709 $ 740  
Interest on post-employment benefits liability 14 12  
Loss on repayment of long-term debt 28 0  
Loss (gain) on foreign exchange 136 (107)  
Change in fair value of derivative instruments (95) 99  
Capitalized interest (20) (18)  
Other 21 20  
Total finance costs 793 $ 746  
Forward contract [member]      
Finance Costs [Abstract]      
Change in fair value of derivative instruments 21    
Senior Notes Due 2018      
Disclosure of detailed information about borrowings [line items]      
Notional amount $ 1,800   $ 1.4