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ACCOUNTS RECEIVABLE AND OTHER (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade receivables and unbilled revenues $ 3,923 $ 5,164
Short-term portion of derivative assets 323 327
Taxes receivable 374 323
Other 638 855
Accounts receivable and other 5,258 6,669
Allowance for doubtful accounts receivable $ 70 $ 50