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Income Taxes - Provision for Income Taxes (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major Components Of Tax Expense Income [Line Items]
Current Tax Expense (Recovery)	$ (13)	$ 17	$ (126)
Deferred Tax Expense (Recovery)	(838)	(814)	(884)
Tax Expense (Recovery) From Continuing Operations	(851)	(797)	(1,010)
Canada [Member]
Major Components Of Tax Expense Income [Line Items]
Current Tax Expense (Recovery)	(14)	14	(128)
United States [Member]
Major Components Of Tax Expense Income [Line Items]
Current Tax Expense (Recovery)	$ 1	$ 3	$ 2

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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