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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2020
Property, plant and equipment [abstract]  
Schedule of property, plant and equipment
ESTIMATED USEFUL LIFE
Property, plant and equipment
Network infrastructure and equipment
2 to 50 years
Buildings
5 to 50 years
Finite-life intangible assets
Software
2 to 12 years
Customer relationships
2 to 26 years
Program and feature film rights
Up to 5 years
FOR THE YEAR ENDED DECEMBER 31, 2020 NOTE
NETWORK
INFRASTRUCTURE
AND EQUIPMENT (1)
LAND AND
BUILDINGS (1)
 ASSETS UNDER
CONSTRUCTION		 TOTAL
COST  
January 1, 2020   67,597  8,079  1,687  77,363 
Additions   2,414  247  2,071  4,732 
Acquired through business combinations   2  5  —  7 
Transfers   964  49  (1,825) (812)
Retirements and disposals   (1,348) (54) (32) (1,434)
Impairment losses recognized in earnings 8 (17) (9) (1) (27)
Discontinued operations 3 (135) (485) (11) (631)
December 31, 2020   69,477  7,832  1,889  79,198 
ACCUMULATED DEPRECIATION  
January 1, 2020   45,914  3,813  —  49,727 
Depreciation   3,035  440  —  3,475 
Retirements and disposals   (1,268) (54) —  (1,322)
Discontinued operations 3 (70) (77) —  (147)
Other   (48) —  —  (48)
December 31, 2020   47,563  4,122  —  51,685 
NET CARRYING AMOUNT  
January 1, 2020   21,683  4,266  1,687  27,636 
December 31, 2020   21,914  3,710  1,889  27,513 
(1)Includes right-of-use assets. See Note 17, Leases, for additional details.
FOR THE YEAR ENDED DECEMBER 31, 2019 NOTE
NETWORK
INFRASTRUCTURE
AND EQUIPMENT (1)
LAND AND
BUILDINGS (1)
 ASSETS UNDER
CONSTRUCTION		 TOTAL
COST              
January 1, 2019   65,048  7,528  1,764  74,340 
Additions   2,508  567  1,694  4,769 
Acquired through business combinations   3  38  —  41 
Transfers   1,130  (14) (1,772) (656)
Retirements and disposals   (1,085) (42) —  (1,127)
Impairment losses recognized in earnings 8 (11) (4) —  (15)
Discontinued operations 3 4  6  1  11 
December 31, 2019   67,597  8,079  1,687  77,363 
ACCUMULATED DEPRECIATION              
January 1, 2019   43,834  3,405  —  47,239 
Depreciation   3,015  443  —  3,458 
Retirements and disposals   (1,003) (27) —  (1,030)
Discontinued operations 3 14  23  —  37 
Other   54  (31) —  23 
December 31, 2019   45,914  3,813  —  49,727 
NET CARRYING AMOUNT              
January 1, 2019   21,214  4,123  1,764  27,101 
December 31, 2019   21,683  4,266  1,687  27,636 
(1)Includes right-of-use assets. See Note 17, Leases, for additional details.