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Segmented information - Segmented Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
CAD ($)
Dec. 31, 2020
CAD ($)
segment
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Operating Segments [Abstract]        
Number of operating segments | segment   3    
Disclosure of operating segments [line items]        
Operating revenues   $ 22,883 $ 23,793  
Operating costs   (13,276) (13,787)  
Segment profit   9,607 10,006  
Severance, acquisition and other costs   (116) (114)  
Depreciation and amortization   (4,404) (4,344)  
Finance costs        
Interest expense   (1,110) (1,125)  
Interest on post-employment benefit obligations   (46) (63)  
Impairment of assets   (472) (102)  
Other (expense) income   (194) 95  
Income taxes   (792) (1,129)  
Net earnings from continuing operations   2,473 3,224  
Net earnings from discontinued operations   226 29  
Total net income (losses)   2,699 3,253  
Goodwill   10,604 10,667  
Indefinite-life intangible assets   7,840 8,021  
Capital expenditures   4,202 3,974  
BELL WIRELESS        
Disclosure of operating segments [line items]        
Operating revenues   8,630 8,946  
Finance costs        
Goodwill   3,046 3,046  
Indefinite-life intangible assets   4,063 3,948  
Capital expenditures   916 671  
BELL WIRELINE        
Disclosure of operating segments [line items]        
Operating revenues   11,884 12,036  
Finance costs        
Goodwill   4,612 4,675  
Indefinite-life intangible assets   1,692 1,692  
Capital expenditures   3,161 3,195  
BELL MEDIA        
Disclosure of operating segments [line items]        
Operating revenues   2,369 2,811  
Finance costs        
Impairment of assets $ (452)      
Goodwill   2,946 2,946  
Indefinite-life intangible assets   2,085 2,381  
Capital expenditures   125 108  
Intersegment eliminations        
Disclosure of operating segments [line items]        
Operating revenues   (756) (742)  
Operating costs   756 742  
Finance costs        
Capital expenditures   0    
Intersegment eliminations | BELL WIRELESS        
Disclosure of operating segments [line items]        
Operating revenues   53 55  
Intersegment eliminations | BELL WIRELINE        
Disclosure of operating segments [line items]        
Operating revenues   322 281  
Intersegment eliminations | BELL MEDIA        
Disclosure of operating segments [line items]        
Operating revenues   381 406  
Operating segments | BELL WIRELESS        
Disclosure of operating segments [line items]        
Operating revenues   8,683 9,001  
Operating costs   (5,017) (5,210)  
Segment profit   3,666 3,791  
Operating segments | BELL WIRELINE        
Disclosure of operating segments [line items]        
Operating revenues   12,206 12,317  
Operating costs   (6,960) (6,952)  
Segment profit   5,246 5,365  
Operating segments | BELL MEDIA        
Disclosure of operating segments [line items]        
Operating revenues   2,750 3,217  
Operating costs   (2,055) (2,367)  
Segment profit   695 850  
Goodwill        
Finance costs        
Intangible assets and goodwill       $ 10,658
Goodwill   10,604 10,667  
Goodwill | BELL WIRELESS        
Finance costs        
Intangible assets and goodwill       3,046
Goodwill   3,046 3,046  
Goodwill | BELL WIRELINE        
Finance costs        
Intangible assets and goodwill       4,681
Goodwill   4,612 $ 4,675  
Goodwill | BELL MEDIA        
Finance costs        
Intangible assets and goodwill       $ 2,931
Goodwill   $ 2,946