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Income Taxes - Provision for Income Taxes (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |
Current Tax Expense (Recovery) |  | $ 1,639 | $ 276 |  | $ (13) |
Deferred Tax Expense (Recovery) |  | 642 | 452 |  | (838) |
Total Tax Expense (Recovery) From Operations |  | 2,281 | 728 | [1] | (851) | [1]
Canada |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |
Current Tax Expense (Recovery) |  | 1,252 | 104 |  | (14) |
Deferred Tax Expense (Recovery) | $ 106 |  |  |  |  |
United States |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |
Current Tax Expense (Recovery) |  | 104 | 0 |  | 1 |
Deferred Tax Expense (Recovery) | $ 217 |  |  |  |  |
Asia Pacific |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |
Current Tax Expense (Recovery) |  | 262 | 171 |  | 0 |
Other International |  |  |  |  |  |
Major Components Of Tax Expense Income [Line Items] |  |  |  |  |  |
Current Tax Expense (Recovery) |  | $ 21 | $ 1 |  | $ 0 |
[1] | See Note 3X for revisions to prior period results.

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