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ACCOUNTS RECEIVABLE AND OTHER (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Receivables [Abstract]    
Trade receivables and unbilled revenues $ 4,957 $ 3,923
Current derivative assets 529 323
Regulatory assets (Note 7) 259 232
Taxes receivable 407 374
Other 710 406
Accounts receivable and other (Note 9) 6,862 5,258
Allowance for doubtful accounts receivable $ 87 $ 70