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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2021
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Income Taxes | $ 694 | $ 694 | $ 36 |  |  | $ 1,100
Canadian Statutory Tax Rate |  | 23.70% | 24.00% | 26.50% |  |
Deferred tax (expense) recovery |  | $ 0 | $ 0 | $ 387 |  |
Deferred income tax assets has been recognized |  |  | 36 |  |  |
Amounts of tax pools available, including tax losses | 17,682 | 17,682 | 9,657 |  |  |
Deferred Tax Expense (Recovery) |  | 452 | (838) | (814) |  |
Canadian Federal Non Capital Losses |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Amounts of tax pools available, including tax losses | 1,500 | 1,500 | 1,700 |  |  |
US Federal Net Operating Losses |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Amounts of tax pools available, including tax losses | 775 | 775 | 1,100 |  |  |
Canadian Net Capital Losses |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Amounts of tax pools available, including tax losses | 102 | 102 | 85 |  |  |
Net capital losses associated with unrealized foreign exchange losses |  | 102 | 254 |  |  |
Internal Restructuring |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred tax (expense) recovery |  |  |  | $ 387 |  |
Canada |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Income Taxes |  |  |  |  |  | 1,100
Amounts of tax pools available, including tax losses | 11,167 | 11,167 | 6,540 |  |  |
Deferred Tax Expense (Recovery) | 106 |  |  |  |  |
United States |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Income Taxes |  |  |  |  |  | 359
Amounts of tax pools available, including tax losses | 5,915 | 5,915 | 3,117 |  |  |
Deferred Tax Expense (Recovery) | 217 |  |  |  |  |
Asia Pacific |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Income Taxes |  |  |  |  |  | $ (444)
Amounts of tax pools available, including tax losses | $ 600 | $ 600 | $ 0 |  |  |
Alberta |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Canadian Statutory Tax Rate |  |  | 8.00% | 8.00% | 12.00% |
Deferred tax (expense) recovery |  |  |  | $ 671 |  |

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