Inventories (Tables)

12 Months Ended

Dec. 31, 2019

Inventories [Abstract]

Summary of Inventories

Inventories

(CAD$ in millions)	December 31, 2019			December 31, 2018
Supplies	$	721		$	693
Raw materials	271			300
Work in process	491			595
Finished products	573			539
	2,056			2,127
Less long-term portion (Note 14)	(75		)	(62		)
	$	1,981		$	2,065