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LONG-TERM DEBT - Bank Credit and Letter of Credit Facilities (Details)
$ in Millions, $ in Millions
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about borrowings [line items]              
Long-term debt $ 13,390   $ 12,692   $ 15,330    
Short-term borrowings 2,255   1,585   $ 800    
Revolving Credit Facility Due March 2022              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity $ 3,200            
Revolving Credit Facility Due March 2022 | Bank Prime Rate or Base Rate | Minimum              
Disclosure of detailed information about borrowings [line items]              
Spread on variable rate 0.00% 0.00%          
Revolving Credit Facility Due March 2022 | Bank Prime Rate or Base Rate | Maximum              
Disclosure of detailed information about borrowings [line items]              
Spread on variable rate 1.25% 1.25%          
Revolving Credit Facility Due March 2022 | Bankers' Acceptance Rate or London Inter-Bank Offered Rate | Minimum              
Disclosure of detailed information about borrowings [line items]              
Spread on variable rate 0.85% 0.85%          
Revolving Credit Facility Due March 2022 | Bankers' Acceptance Rate or London Inter-Bank Offered Rate | Maximum              
Disclosure of detailed information about borrowings [line items]              
Spread on variable rate 2.25% 2.25%          
Revolving Credit Facility due September 2020              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity $ 2,500            
Revolving Credit Facility Tranche due March 2020              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity 700            
Bank and Letter of Credit Facilities              
Disclosure of detailed information about borrowings [line items]              
Maximum borrowing capacity 4,200   3,300        
Long-term debt 1,000   100        
Undrawn borrowing facilities 1,600   2,300        
US commercial paper              
Disclosure of detailed information about borrowings [line items]              
Short-term borrowings $ 1,605 $ 1,178 $ 935 $ 746   $ 0 $ 0