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Trade and other receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure Of Trade And Other Receivables [Line Items]      
Current tax receivable $ 14 $ 31 $ 35
Other accounts receivable 123 101 123
Total trade and other receivables 3,006 3,129 2,988
Gross carrying amount      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade receivables 3,026 3,135 2,973
Allowance for doubtful accounts      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade receivables (51) (54) (60)
Allowance for revenue adjustments      
Disclosure Of Trade And Other Receivables [Line Items]      
Trade receivables $ (106) $ (84) $ (83)