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SHORT-TERM BORROWINGS - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
US commercial paper          
Disclosure of detailed information about borrowings [line items]          
Maximum aggregate principal allowed to issue         $ 1,500,000,000
Proceeds received from short-term borrowings $ 17,127,000,000 $ 12,897,000,000 $ 19,752,000,000 $ 15,262,000,000  
Repayments of short-term borrowings $ 17,094,000,000 $ 12,876,000,000 19,244,000,000 14,858,000,000  
US commercial paper | Minimum          
Disclosure of detailed information about borrowings [line items]          
Maturity term 1 day 1 day      
US commercial paper | Maximum          
Disclosure of detailed information about borrowings [line items]          
Maturity term 397 days 397 days      
Non-Revolving Credit Facility          
Disclosure of detailed information about borrowings [line items]          
Maximum borrowing capacity $ 2,900,000,000       $ 2,200,000,000
Proceeds received from short-term borrowings 561,000,000 $ 420,000,000 0 0  
Repayments of short-term borrowings $ 564,000,000 $ 420,000,000 $ 0 $ 0