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ACCOUNTS RECEIVABLE AND OTHER (Details) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Trade receivables and unbilled revenues CAD 5,325 CAD 3,814
Other 1,728 1,164
Accounts receivable and other 7,053 4,978
Allowance for doubtful accounts receivable CAD 50 CAD 46