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Financing Costs (Detail) - CAD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Debt-related interest		$ 21	$ 34
Capitalized interest		(8)	(15)
Net interest expense		13	19
Other interest		1	0
Total financing	[1]	$ 14	$ 19
[1] Amounts to related parties included in financing, (note 5). 11 24

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