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SHORT-TERM BORROWINGS - Movement in Borrowing Programs (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
$ / $
Dec. 31, 2019
USD ($)
$ / $
Dec. 31, 2018
CAD ($)
$ / $
Dec. 31, 2018
USD ($)
$ / $
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings, beginning balance $ 2,255      
Net proceeds received from short-term borrowings 30   $ 508  
(Gain) loss on foreign exchange (79)   136  
Short-term borrowings, ending balance 2,238   2,255  
Accounts receivable securitization program        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings, beginning balance 650      
Net proceeds received from short-term borrowings 0   0  
Short-term borrowings, ending balance 650   650  
US commercial paper        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings, beginning balance $ 1,605 $ 1,177 $ 935 $ 746
Exchange rate on short-term borrowings | $ / $ 1.364 1.364 1.253 1.253
Net proceeds received from short-term borrowings $ 33 $ 21 $ 508 $ 404
Exchange rate on proceeds received from short-term borrowings, net | $ / $ 1.571 1.571 1.257 1.257
Discount on issuance $ 33 $ 25 $ 36 $ 27
Exchange rate on discounts on issuance of short-term borrowings | $ / $ 1.320 1.320 1.333 1.333
(Gain) loss on foreign exchange $ (83)   $ 126  
Short-term borrowings, ending balance $ 1,588 $ 1,223 $ 1,605 $ 1,177
Exchange rate on short-term borrowings | $ / $ 1.298 1.298 1.364 1.364