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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, 2018
Dec. 31, 2017
+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
-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)
+20bp [member] | Swap contracts [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 (100) (400)
-20bp [member] | Swap contracts [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 100 400
-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 (2,900) (2,800)
-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 (1,300) (1,300)
-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 (1,600) (1,500)
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 2,800 2,700
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 1,200 1,300
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 $ 1,600 $ 1,400