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Income Taxes - Additional Information (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statement [line items]    
Effective income tax rate 26.50% 26.50%
Current tax receivable $ 660 $ 993
Current tax payable 357 87
Deferred tax assets 5,254 4,842
Deferred tax assets - recognition dependent on future taxable profits 942 1,005
Operating tax loss carry forward 2,689 2,479
Operating tax loss carry forward expired in future 2,514  
Operating tax loss carry forward without expiration date 174  
Capital tax loss carry forward 1 21
Tax benefit on loss carry forwards for which deferred tax asset recognized 517 497
Tax benefit of loss carry forwards for which no deferred tax asset recognized 120 99
Tax credit carry forwards which expire in future 200 188
Tax credit carryforwards of which benefit not recognized $ 154 154
Tax credit/Loss carryforwards expiration period between the years 2026 and 2041  
Deferred tax liability $ 2,769 2,614
Aggregate amount of taxable temporary differences associated with the Company's own investments in subsidiaries, not included in financial statements 24,034 22,782
Unused tax credits [member]    
Statement [line items]    
Deferred tax assets 490 96
Temporary differences [member]    
Statement [line items]    
Deferred tax assets $ 1,867 $ 385