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SHORT-TERM BORROWINGS - Movement in Borrowing Programs (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
$ / $
Dec. 31, 2020
USD ($)
$ / $
Dec. 31, 2019
CAD ($)
$ / $
Dec. 31, 2019
USD ($)
$ / $
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings, beginning balance $ 2,238      
Net (repayment of) proceeds received from short-term borrowings (1,146)   $ 30  
Loss (gain) on foreign exchange 107   (79)  
Short-term borrowings, ending balance 1,221   2,238  
Commercial paper program        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings, beginning balance $ 1,600 $ 1,223 $ 1,605 $ 1,177
Exchange rate on short-term borrowings | $ / $ 1.298 1.298 1.364 1.364
Net (repayment of) proceeds received from short-term borrowings $ (1,146) $ (782) $ 33 $ 21
Exchange rate on (repayment of) proceeds received from short-term borrowings, net | $ / $ 1.465 1.465 1.571 1.571
Discount on issuance $ 10 $ 8 $ 33 $ 25
Exchange rate on discounts on issuance of short-term borrowings | $ / $ 1.250 1.250 1.320 1.320
Loss (gain) on foreign exchange $ 119   $ (83)  
Short-term borrowings, ending balance $ 571 $ 449 $ 1,600 $ 1,223
Exchange rate on short-term borrowings | $ / $ 1.272 1.272 1.298 1.298