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IFRS 7 Disclosures - Additional Information (Detail)
CAD in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2017
CAD
Dec. 31, 2017
USD ($)
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Liabilities on current in-force business due period 2018 to 2038      
Dynamically hedged variable annuity guarantee best estimate liabilities, rebalancing percentage intervals 5.00%      
Sensitivity of net income attributed to shareholders 0.50%      
Variable annuity guarantee liabilities, rebalanced basis point intervals 0.20%      
Net after-tax unrealized loss position of AFS fixed income assets | CAD     CAD 223  
Total unencumbered assets | CAD   CAD 396,300 396,800  
50 basis point decrease in interest        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Sensitivity of our net income attributed to shareholders due to change in interest rate $ (200,000,000)      
50 basis point increase in interest        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Sensitivity of our net income attributed to shareholders due to change in interest rate 100,000,000      
50 basis point decrease in corporate spreads [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Increase in sensitivity due to decision to reduce the allocation to ALDA in the portfolio asset 200,000,000      
-10% [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Potential impact on net income attributed to shareholders arising from lower U.S. corporate income tax rate $ 300,000,000      
Unsecured revolving credit facility [Member] | Canadian chartered banks [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Estimated maximum borrowing capacity | CAD     CAD 500  
Unsecured revolving credit facility [Member] | U.S.banks [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Estimated maximum borrowing capacity       $ 500,000,000
Amounts outstanding       0
FHLBI facility [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Estimated maximum borrowing capacity       4,300,000,000
Amounts outstanding       $ 0
10% [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Percentage of expected changes in market values of publicly traded equities 10.00% 10.00%    
20% [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Percentage of expected changes in market values of publicly traded equities 20.00% 20.00%    
30% [Member]        
Financial Instruments - Disclosures under IFRS 7 [Line Items]        
Percentage of expected changes in market values of publicly traded equities 30.00% 30.00%