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Insurance Contract Liabilities and Reinsurance Assets - Summary of Actuarial Methods and Assumptions (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Total $ 287 $ 563
Attributed to participating policyholders' account 222 301
Attributed to shareholders'account 65 262
Change in net income attributed to shareholders (41) (198)
Mortality and morbidity updates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Total 350 (304)
Attributed to participating policyholders' account   (1)
Attributed to shareholders'account 350 (303)
Change in net income attributed to shareholders (257) 232
Lapses and policyholder behavior updates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Total 686 893
Attributed to participating policyholders' account 18 0
Attributed to shareholders'account 668 893
Change in net income attributed to shareholders (534) (682)
Expense Updates [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Total (653)  
Attributed to participating policyholders' account (25)  
Attributed to shareholders'account (628)  
Change in net income attributed to shareholders 503  
Investment return assumptions [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Total (257) (212)
Attributed to participating policyholders' account (2) (153)
Attributed to shareholders'account (255) (59)
Change in net income attributed to shareholders 168 31
Other updates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Total 110 228
Attributed to participating policyholders' account 231 455
Attributed to shareholders'account (121) (227)
Change in net income attributed to shareholders 119 190
Long term care triennial review [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Total 51 (42)
Attributed to participating policyholders' account   0
Attributed to shareholders'account 51 (42)
Change in net income attributed to shareholders $ (40) $ 31