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SHORT-TERM BORROWINGS - Accounts Receivable Securitization (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 25, 2021
Dec. 23, 2020
Dec. 22, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]          
Short-term borrowings from buyer $ (1,221,000,000)       $ (2,238,000,000)
Receivables securitization program          
Disclosure of detailed information about borrowings [line items]          
Maximum proceeds under program     $ 1,200,000,000 $ 1,050,000,000.00  
Funding available under program     $ 650,000,000    
Trade receivables, maximum commitment $ 1,200,000,000       1,050,000,000
Term of program 3 years        
Receivables sold to buyer as security $ 2,130,000,000       1,359,000,000
Short-term borrowings from buyer (650,000,000)       (650,000,000)
Overcollateralization $ 1,480,000,000       $ 709,000,000
Receivables securitization program | Minimum | Subsequent Event          
Disclosure of detailed information about borrowings [line items]          
Funding available under program   $ 800,000,000