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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 | Jan. 01, 2021
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Tax Expense (Recovery) |  | $ 642 | $ 452 | $ (838) |  |
Canadian statutory tax rate |  | 23.70% | 23.70% | 24.00% |  |
Deferred Income Taxes | $ 694 | $ 546 | $ 694 |  |  | $ 1,100
Amounts of tax pools available, including tax losses | 17,682 | 15,439 | 17,682 |  |  |
Sunrise |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Income Taxes |  | (486) |  |  |  |
Canadian Federal Non Capital Losses |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Amounts of tax pools available, including tax losses | 1,500 | 115 | 1,500 |  |  |
US Federal Net Operating Losses |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Amounts of tax pools available, including tax losses | 775 | 468 | 775 |  |  |
Canadian Net Capital Losses |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Amounts of tax pools available, including tax losses | 102 | 28 | 102 |  |  |
Net capital losses associated with unrealized foreign exchange losses |  | 504 | 102 |  |  |
United States |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Tax Expense (Recovery) | 217 |  |  |  |  |
Deferred Income Taxes |  |  |  |  |  | 359
Amounts of tax pools available, including tax losses | 5,915 | 6,477 | 5,915 |  |  |
Canada |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Tax Expense (Recovery) | 106 |  |  |  |  |
Deferred Income Taxes |  |  |  |  |  | 1,100
Amounts of tax pools available, including tax losses | 11,167 | 8,505 | 11,167 |  |  |
Alberta |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Canadian statutory tax rate |  |  |  | 8.00% | 12.00% |
Asia Pacific |  |  |  |  |  |
Disclosure of income taxes [line items] |  |  |  |  |  |
Deferred Income Taxes |  |  |  |  |  | $ (444)
Amounts of tax pools available, including tax losses | $ 600 | $ 457 | $ 600 |  |  |

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