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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2023
Property, plant and equipment [abstract]  
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, 2022
Cost$944 $21,362 $18,716 $7,334 $9,931 $58,287 
Accumulated depreciation— (6,681)(9,578)(4,646)— (20,905)
Net book value$944 $14,681 $9,138 $2,688 $9,931 $37,382 
Year ended December 31, 2022
Opening net book value$944 $14,681 $9,138 $2,688 $9,931 $37,382 
Additions102 — 389 1,138 4,964 6,593 
Disposals— — (25)— (5)(30)
Asset impairment
(37)(247)(959)— — (1,243)
Depreciation and amortization— (325)(906)(630)— (1,861)
Transfers between classifications— 104 1,420 — (1,524)— 
Changes in decommissioning,
   restoration and other provisions		— (743)(145)— — (888)
Capitalized borrowing costs
   (Note 11)		— 131 — — 358 489 
Transfer to assets held for sale
(142)(546)(735)— (129)(1,552)
Changes in foreign exchange
   rates		28 235 172 52 718 1,205 
Closing net book value$895 $13,290 $8,349 $3,248 $14,313 $40,095 
At December 31, 2022
Cost$895 $20,364 $18,567 $8,596 $14,313 $62,735 
Accumulated depreciation— (7,074)(10,218)(5,348)— (22,640)
Net book value$895 $13,290 $8,349 $3,248 $14,313 $40,095 
Year ended December 31, 2023
Opening net book value$895 $13,290 $8,349 $3,248 $14,313 $40,095 
Additions581 198 918 1,198 3,615 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		(25)(89)(282)(25)(195)(616)
Closing net book value$1,432 $14,270 $21,792 $3,682 $4,389 $45,565 
At December 31, 2023
Cost$1,432 $20,693 $32,637 $9,738 $4,389 $68,889 
Accumulated depreciation— (6,423)(10,845)(6,056)— (23,324)
Net book value$1,432 $14,270 $21,792 $3,682 $4,389 $45,565