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Income Taxes - Reconciliation of Income Taxes Calculated at Statutory Rate (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Income Tax Expense Continuing Operations [Abstract]      
Earnings (Loss) Before Income Tax $ 8,731 $ 1,315 [1] $ (3,230) [1]
Canadian Statutory Rate 23.70% 23.70% 24.00%
Expected Income Tax Expense (Recovery) From Operations $ 2,069 $ 312 $ (775)
Effect on Taxes Resulting From:      
Statutory and Other Rate Differences 17 3 19
Non-Taxable Capital (Gains) Losses 84 63 (42)
Non-Recognition of Capital (Gains) Losses 84 27 (42)
Adjustments Arising From Prior Year Tax Filings 15 (5) (8)
U.S. Tax Attribute Limitation 0 217 0
Impact of Rate Changes 0 106 (7)
Other 12 5 4
Total Tax Expense (Recovery) From Operations $ 2,281 $ 728 [1] $ (851) [1]
Effective Tax Rate 26.10% 55.40% 26.30%
[1] See Note 3X for revisions to prior period results.