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IFRS 7 Disclosures - Summary of Potential Impact on Net Income Attributed to Shareholders Arising from Changes to Spreads (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
+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 CAD 1,000 CAD 700
-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 (1,000) (800)
+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 (400) (500)
-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 400 500
-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) (2,500)
-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 (1,500) (1,200)
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 2,700 2,400
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 1,200
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 CAD 1,400 CAD 1,200