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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2024
Property, plant and equipment [abstract]  
Schedule of Property, Plant and Equipment
(CAD$ in millions)Exploration
and
Evaluation		Mineral
Properties		Land,
Buildings,
Plant and
Equipment		Capitalized
Production
Stripping
Costs		Construction
In Progress		Total
At January 1, 2023
Cost$991 $20,364 $18,514 $8,596 $14,270 $62,735 
Accumulated depreciation— (7,074)(10,218)(5,348)— (22,640)
Net book value$991 $13,290 $8,296 $3,248 $14,270 $40,095 
Year ended December 31, 2023
Opening net book value$991 $13,290 $8,296 $3,248 $14,270 $40,095 
Additions619 198 864 1,198 3,631 6,510 
Disposals(12)(2)(34)— (7)(55)
Depreciation and amortization
— (377)(964)(739)— (2,080)
Transfers between
   classifications (c)		— 324 13,787 — (14,111)— 
Changes in decommissioning,
   restoration and other provisions		(7)926 18 — (6)931 
Capitalized borrowing costs
   (Note 11)
— — — — 780 780 
Changes in foreign exchange
   rates		(26)(89)(280)(25)(196)(616)
Closing net book value$1,565 $14,270 $21,687 $3,682 $4,361 $45,565 
At December 31, 2023
Cost$1,565 $20,693 $32,532 $9,738 $4,361 $68,889 
Accumulated depreciation— (6,423)(10,845)(6,056)— (23,324)
Net book value$1,565 $14,270 $21,687 $3,682 $4,361 $45,565 
Year ended December 31, 2024
Opening net book value$1,565 $14,270 $21,687 $3,682 $4,361 $45,565 
Additions315 1 533 846 1,447 3,142 
Disposals(7)(4)(50)— (2)(63)
Change from the NSC/POSCO
   transaction (Note 5)
— 115 105 83 39 342 
Sale of steelmaking coal business
   (Note 5)
— (9,609)(4,214)(2,090)(1,360)(17,273)
Asset impairment
— — (961)— (54)(1,015)
Depreciation and amortization— (396)(1,459)(586)— (2,441)
Transfers between
   classifications (c)		— 106 3,217 — (3,323)— 
Changes in decommissioning,
   restoration and other provisions		— 39 (9)— — 30 
Capitalized borrowing costs
   (Note 11)
— — — — 66 66 
Changes in foreign exchange
   rates		82 357 1,500 95 181 2,215 
Closing net book value$1,955 $4,879 $20,349 $2,030 $1,355 $30,568 
At December 31, 2024
Cost$1,955 $6,988 $29,313 $4,417 $1,355 $44,028 
Accumulated depreciation— (2,109)(8,964)(2,387)— (13,460)
Net book value$1,955 $4,879 $20,349 $2,030 $1,355 $30,568