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ACCOUNTS RECEIVABLE (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Total accounts receivable $ 2,304 $ 2,236 $ 2,236
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Customer accounts receivable 1,579   1,529
Other accounts receivable 785   762
Allowance for doubtful accounts      
Disclosure of detailed information about financial instruments [line items]      
Total accounts receivable $ 60   $ 55