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Income Taxes - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Statement [line items]    
Effective income tax rate 27.50% 26.50%
Current tax receivable $ 1,135 $ 660
Current tax payable 195 357
Deferred tax assets 5,423 5,254
Deferred tax assets - recognition dependent on future taxable profits 40 942
Operating tax loss carry forward 3,902 2,689
Operating tax loss carry forward expired in future 3,684  
Operating tax loss carry forward without expiration date 218  
Capital tax loss carry forward 1 1
Tax benefit on loss carry forwards for which deferred tax asset recognized 701 517
Tax benefit of loss carry forwards for which no deferred tax asset recognized 211 120
Tax credit carry forwards which expire in future 273 200
Tax credit carryforwards of which benefit not recognized $ 164 154
Tax credit/Loss carryforwards expiration period between the years 2026 and 2042  
Deferred tax liability $ 2,774 2,769
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements 20,625 24,034
Unused tax credits [member]    
Statement [line items]    
Deferred tax assets 507 490
Temporary differences [member]    
Statement [line items]    
Deferred tax assets $ 1,829 $ 1,867