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Other (expense) income - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2025
Jun. 30, 2024
Jun. 30, 2024
Disclosure of analysis of single amount of discontinued operations [line items]      
Equity loss from investments in associates and joint ventures   $ 93 $ 93
MSLE | Disposal of major subsidiary      
Disclosure of analysis of single amount of discontinued operations [line items]      
Proceeds from sale of operations $ 4,700