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advance billings and customer deposits (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
advance billings and customer deposits    
Advance billings $ 820 $ 718
Deferred customer activation and connection fees 3 3
Customer deposits 15 15
Contract liabilities 838 736
Other 201 235
Total $ 1,039 $ 971