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SHORT-TERM BORROWINGS - Proceeds/Repayments From 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]        
Net proceeds received on short-term borrowings $ 30   $ 508  
US commercial paper        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ 17,127 $ 12,897 $ 19,752 $ 15,262
Exchange rate on proceeds received from short-term borrowings 1.328 1.328 1.294 1.294
Repayments of short-term borrowings $ (17,094) $ (12,876) $ (19,244) $ (14,858)
Exchange rate on repayments of short-term borrowings 1.328 1.328 1.295 1.295
Net proceeds received on short-term borrowings $ 33 $ 21 $ 508 $ 404
Accounts receivable securitization program        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings 0   225  
Repayments of short-term borrowings 0   (225)  
Net proceeds received on short-term borrowings 0   0  
Credit facilities        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ 561 $ 420 $ 0 $ 0
Exchange rate on proceeds received from short-term borrowings 1.336 1.336 0 0
Repayments of short-term borrowings $ (564) $ (420) $ 0 $ 0
Exchange rate on repayments of short-term borrowings 1.343 1.343 0 0
Net proceeds received on short-term borrowings $ (3)   $ 0