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Income Taxes - Reconciliation of Income Taxes Calculated at Statutory Rate (Detail) - CAD ($)
$ in Millions
 12 Months Ended
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.