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IFRS 7 Disclosures - Summary of Potential Impact on Net Income Attributed to Shareholders Arising from Changes to Spreads (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
+50bp [member] | Corporate spreads [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads $ 500 $ 900
-50bp [member] | Corporate spreads [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads (600) (1,000)
-10% [member] | Alternative Long-Duration Asset Performance Risk [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads 3,300 (3,600)
-10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Real estate, agriculture and timber assets [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads 1,400 (1,600)
-10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Private equities and other ALDA [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads (1,900) (2,000)
10% [member] | Alternative Long-Duration Asset Performance Risk [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads 3,200 3,300
10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Real estate, agriculture and timber assets [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads 1,400 1,400
10% [member] | Alternative Long-Duration Asset Performance Risk [member] | Private equities and other ALDA [member]    
Disclosure of Interest Rate and Spread Risk Sensitivities and Exposure Measures [line items]    
Potential impact on net income attributed to shareholders arising from changes to spreads $ 1,800 $ 1,900