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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure of detailed information about intangible assets [abstract]  
Summary of Intangible Assets
(CAD$ in millions)Total
At January 1, 2023
Cost
$525 
Accumulated amortization and impairment
(125)
Net book value
$400 
Year ended December 31, 2023
Opening net book value$400 
Additions – internal development
83 
Amortization
(50)
Impairment
(88)
Closing net book value$345 
At December 31, 2023
Cost$608 
Accumulated amortization and impairment
(263)
Net book value$345 
Year ended December 31, 2024
Opening net book value$345 
Additions – internal development
17 
Amortization
(43)
Impairment(75)
Change in foreign exchange rates3 
       Sale of steelmaking coal business
(51)
Closing net book value$196 
At December 31, 2024
Cost
$577 
Accumulated amortization and impairment
(381)
Net book value$196