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SHORT-TERM BORROWINGS - Proceeds/Repayments From 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]        
Net (repayment of) proceeds received from short-term borrowings $ (1,146)   $ 30  
Commercial paper program        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ 4,406 $ 3,316 $ 17,127 $ 12,897
Exchange rate on proceeds received from short-term borrowings 1.329 1.329 1.328 1.328
Repayments of short-term borrowings $ (5,552) $ (4,098) $ (17,094) $ (12,876)
Exchange rate on repayments of short-term borrowings 1.355 1.355 1.328 1.328
Net (repayment of) proceeds received from short-term borrowings $ (1,146) $ (782) $ 33 $ 21
Credit facilities        
Disclosure of detailed information about borrowings [line items]        
Proceeds received from short-term borrowings $ 0 $ 0 $ 561 $ 420
Exchange rate on proceeds received from short-term borrowings 0 0 1.336 1.336
Repayments of short-term borrowings $ 0 $ 0 $ (564) $ (420)
Exchange rate on repayments of short-term borrowings 0 0 1.343 1.343
Net (repayment of) proceeds received from short-term borrowings $ 0   $ (3)