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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Total accounts receivable $ 3,604 $ 2,452
Current 2,856 2,376
Long-term 748 76
Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Customer accounts receivable 3,170 1,727
Other accounts receivable 656 785
Allowance for doubtful accounts    
Disclosure of detailed information about financial instruments [line items]    
Total accounts receivable $ 222 $ 60