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advance billings and customer deposits - Contract liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
advance billings and customer deposits    
Contract liabilities at beginning of period $ 801 $ 811
Revenue deferred in previous period and recognized in current period (577) (648)
Net additions arising from operations 539 605
Additions arising from business acquisitions 43 33
Contract liabilities at end of period 806 801
Current 735 718
Non-current    
Deferred revenues 61 70
Deferred customer activation and connection fees $ 10 $ 13