Inventories (Tables)

12 Months Ended

Dec. 31, 2020

Inventories [Abstract]

Summary of Inventories

(CAD$ in millions)	December 31, 2020		December 31, 2019
Supplies	$	757	$	721
Raw materials	197		271
Work in process	592		491
Finished products	410		573
	1,956		2,056
Less long-term portion (Note 14)	(84)		(75)
	$	1,872	$	1,981