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Income Taxes - Additional Information (Detail) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of income taxes [line items] |  |  |
Canadian Statutory Tax Rate | 24.00% | 26.50% | 27.00%
Deferred tax (expense) recovery |  | $ 387,000,000 | $ 78,000,000
Deferred income tax assets has been recognized | $ 36,000,000 |  |
Deferred tax liability has been recognized | 0 | 0 |
Amounts of tax pools available, including tax losses | 9,657,000,000 | 8,761,000,000 |
Net capital losses recognized as a deferred income tax asset | 22,000,000 | 100,000,000 |
Canadian Federal Non Capital Losses [Member] |  |  |
Disclosure of income taxes [line items] |  |  |
Amounts of tax pools available, including tax losses | 1,682,000,000 | 696,000,000 |
US Federal Net Operating Losses [Member] |  |  |
Disclosure of income taxes [line items] |  |  |
Amounts of tax pools available, including tax losses | 1,084,000,000 | 188,000,000 |
Canadian Net Capital Losses [Member] |  |  |
Disclosure of income taxes [line items] |  |  |
Amounts of tax pools available, including tax losses | 85,000,000 | 188,000,000 |
Net capital losses associated with unrealized foreign exchange losses | $ 254,000,000 | 262,000,000 |
Internal Restructuring [Member] |  |  |
Disclosure of income taxes [line items] |  |  |
Deferred tax (expense) recovery |  | $ 387,000,000 |
Alberta [Member] |  |  |
Disclosure of income taxes [line items] |  |  |
Canadian Statutory Tax Rate | 8.00% | 8.00% | 12.00%
Reduction in provincial corporate tax rate enacted period |  | 4 years |
Deferred tax (expense) recovery |  | $ 671,000,000 |

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