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Income Taxes - Reconciliation of Income Taxes Calculated at Statutory Rate (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Income Tax Expense Continuing Operations [Abstract] |  |  |  |  |
Earnings (Loss) From Operations Before Income Tax | $ 1,315 | $ (3,230) |  | $ 1,397 |
Canadian Statutory Rate | 23.70% | 24.00% |  | 26.50% |
Expected Income Tax Expense (Recovery) From Operations | $ 312 | $ (775) |  | $ 370 |
Effect on Taxes Resulting From: |  |  |  |  |
Statutory and Other Rate Differences | 3 | 19 |  | (52) |
Non-Taxable Capital (Gains) Losses | 63 | (42) |  | (38) |
Non-Recognition of Capital (Gains) Losses | 27 | (42) |  | (39) |
Adjustments Arising From Prior Year Tax Filings | (5) | (8) |  | 4 |
Recognition of U.S. Tax Basis | 0 | 0 |  | (387) |
U.S. Tax Attribute Limitation | 217 | 0 |  | 0 |
Impact of Rate Changes | 106 | (7) |  | (671) |
Other | 5 | 4 |  | 16 |
Total Tax Expense (Recovery) From Operations | $ 728 | $ (851) | [1] | $ (797) | [1]
Effective Tax Rate | 55.40% | 26.30% |  | (57.10%) |
[1] | See Note 3(w) for revisions to comparative results.

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