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Remaining performance obligations (Tables)
12 Months Ended
Dec. 31, 2020
Revenue From Contract With Customer1 [Abstract]  
Remaining performance obligations
The following table shows revenues expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) as at December 31, 2020.
2021 2022 2023 2024 2025 THEREAFTER TOTAL
Wireline 1,411  1,098  593  371  180  530  4,183 
Wireless 1,645  635  44  2,327 
Total 3,056  1,733  637  372  181  531  6,510