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Provisions - Summary of Non-current Provisions (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other provisions [line items]    
Other provisions $ 2,626 $ 4,198
Less current portion of provisions (187) (347)
Decommissioning and restoration provisions and other provisions $ 2,439 $ 3,851