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additional statement of cash flow information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net change in non-cash operating working capital    
Accounts receivable $ 74 $ (70)
Inventories 4 (60)
Contract assets (103) (57)
Prepaid expenses (46) (50)
Accounts payable and accrued liabilities (11) 126
Income and other taxes receivable and payable, net 277 (90)
Advance billings and customer deposits 12 41
Provisions 49 (59)
Total 256 (219)
Cash payments for capital assets, excluding spectrum licences    
Property, plant and equipment (2,383) (2,486)
Intangible assets (657) (617)
Total (3,040) (3,103)
Additions arising from finance leases 102  
Additions arising from non-monetary transactions 24 9
Capital expenditures (2,914) (3,094)
Asset retirement obligations netted (included) in additions 15 (7)
Total (2,899) (3,101)
Other non-cash items included above    
Change in associated non-cash investing working capital 47 (27)
Non-cash change in asset retirement obligation (22) 47
Total (25) (20)
Total (2,874) (3,081)
Issue of shares by subsidiary to non-controlling interests    
Issue of shares 43  
Non-monetary issue of shares in business combination (19)  
Cash proceeds on share issuance 24  
Transaction costs and other   (1)
Total issue of shares by subsidiary to non-controlling interest - Issued or received $ 24 $ (1)