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Leases (Tables)
 12 Months Ended
Dec. 31, 2024
Presentation of leases for lessee [abstract]  
Summary of Adoption of New IFRS Pronouncements As at December 31, 2024, $1.0 billion (2023 – $1.1 billion) of right-of-use assets are recorded as part of land, buildings, plant and equipment within property, plant and equipment.
(CAD$ in millions)20242023
Opening net book value$1,108 $612 
   Additions187 673 
   Depreciation(137)(147)
   Changes in foreign exchange rates and other
49 (30)
   Sale of steelmaking coal business
(196)— 
Closing net book value $1,011 $1,108 
Summary of Disclosure of Lease Liability Continuity Lease Liability Continuity
(CAD$ in millions)20242023
At January 1
$1,061 $571 
Cash flows
   Principal payments(120)(160)
   Interest payments(52)(31)
Non-cash changes
   Additions
182 674 
   Interest expense
49 31 
   Changes in foreign exchange rates and other
40 (24)
   Sale of steelmaking coal business
(209)— 
At December 31
$951 $1,061 
Less current portion of lease liabilities(175)(195)
Non-current lease liabilities$776 $866