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revenue from contracts with customers - Accounts receivable (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Accounts receivable      
Customer accounts receivable $ 1,263 $ 1,212 $ 1,208
Accrued receivables - customer 175 143 131
Allowance for doubtful accounts (53) (43) (54)
Total 1,385 1,312 1,285
Accrued receivables - other 215 302 177
Total 1,600 1,614 1,462
As previously reported      
Accounts receivable      
Customer accounts receivable 1,263 1,221 1,217
IFRS 15 effects      
Accounts receivable      
Customer accounts receivable   (9) (9)
Total $ (9) $ (9) $ (9)