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Remaining performance obligations (Details)
$ in Millions
Dec. 31, 2022
CAD ($)
Disclosure of performance obligations [line items]  
Remaining performance obligations $ 6,456
2023  
Disclosure of performance obligations [line items]  
Remaining performance obligations 2,825
2024  
Disclosure of performance obligations [line items]  
Remaining performance obligations 1,737
2025  
Disclosure of performance obligations [line items]  
Remaining performance obligations 779
2026  
Disclosure of performance obligations [line items]  
Remaining performance obligations 462
2027  
Disclosure of performance obligations [line items]  
Remaining performance obligations 181
THEREAFTER  
Disclosure of performance obligations [line items]  
Remaining performance obligations 472
Wireline  
Disclosure of performance obligations [line items]  
Remaining performance obligations 4,286
Wireline | 2023  
Disclosure of performance obligations [line items]  
Remaining performance obligations 1,343
Wireline | 2024  
Disclosure of performance obligations [line items]  
Remaining performance obligations 1,090
Wireline | 2025  
Disclosure of performance obligations [line items]  
Remaining performance obligations 739
Wireline | 2026  
Disclosure of performance obligations [line items]  
Remaining performance obligations 461
Wireline | 2027  
Disclosure of performance obligations [line items]  
Remaining performance obligations 181
Wireline | THEREAFTER  
Disclosure of performance obligations [line items]  
Remaining performance obligations 472
Wireless  
Disclosure of performance obligations [line items]  
Remaining performance obligations 2,170
Wireless | 2023  
Disclosure of performance obligations [line items]  
Remaining performance obligations 1,482
Wireless | 2024  
Disclosure of performance obligations [line items]  
Remaining performance obligations 647
Wireless | 2025  
Disclosure of performance obligations [line items]  
Remaining performance obligations 40
Wireless | 2026  
Disclosure of performance obligations [line items]  
Remaining performance obligations 1
Wireless | 2027  
Disclosure of performance obligations [line items]  
Remaining performance obligations 0
Wireless | THEREAFTER  
Disclosure of performance obligations [line items]  
Remaining performance obligations $ 0