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ACCOUNTS RECEIVABLE - Narrative (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of reclassification of financial assets [line items]      
Reclassification from accounts receivable $ (2,304) $ (2,236) $ (2,236)
Reclassification to other current assets $ 524 436 459
Restatement Adjustment      
Disclosure of reclassification of financial assets [line items]      
Reclassification from accounts receivable   23 23
Reclassification to other current assets   $ 23 $ 23