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other long-term liabilities (Details) - CAD ($)
$ in Millions
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
other long-term liabilities        
Contract liabilities   $ 78 $ 71  
Other   7 10  
Deferred revenues   85 81  
Pension benefit liabilities   446 490  
Other post-employment benefit liabilities   45 47  
Restricted stock unit and deferred share unit liabilities   63 68  
Derivative liabilities   6 76  
Other   78 67  
Subtotal   723 829  
Deferred customer activation and connection fees   15 18  
Other long-term liabilities $ 700 $ 738 $ 847 $ 736