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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

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