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revenue from contracts with customers - Accounts receivable (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
revenue from contracts with customers    
Customer accounts receivable $ 1,570 $ 1,263
Accrued receivables - customer 180 175
Allowance for doubtful accounts (46) (53)
Total 1,704 1,385
Accrued receivables - other 258 215
Total $ 1,962 $ 1,600