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Insurance Contract Liabilities and Reinsurance Assets - Additional Information (Detail) - CAD
CAD in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Fair value of assets backing net insurance contract liabilities excluding reinsurance assets CAD 278,521 CAD 278,521 CAD 266,119
Fair value of assets backing capital and other liabilities 456,278 456,278 459,256
Change in net insurance and investment contract liabilities   277 655
Change in net income attributed to shareholders CAD 2,800    
Change in net income attributed to shareholders (post-tax)   (35) (453)
ALDA and Public Equity Investment Return Assumptions [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities   1,296  
Change in net income attributed to shareholders (post-tax)   (892)  
Corporate Spread Assumptions [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities   (515)  
Change in net income attributed to shareholders (post-tax)   344  
Refinements To Liability and Tax Cash Flows [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities   (1,049)  
Change in net income attributed to shareholders (post-tax)   696  
U.S. variable annuities guaranteed minimum withdrawal benefit incidence and utilization [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)     665
Canada [Member] | U.S. variable annuities guaranteed minimum withdrawal benefit incidence and utilization [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)     128
Japan [Member] | U.S. variable annuities guaranteed minimum withdrawal benefit incidence and utilization [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)     228
Mortality and morbidity updates [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities   (254) (53)
Change in net income attributed to shareholders (post-tax)   299 76
Mortality and morbidity updates [Member] | U.S [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   384  
Mortality and morbidity updates [Member] | Canada [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   264  
Mortality and morbidity updates [Member] | Canada [Member] | Retail Insurance Business [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   222  
Mortality and morbidity updates [Member] | Asia [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   264  
Mortality and morbidity updates [Member] | Japan [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   197 76
Lapses and policyholder behavior [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities   1,019  
Change in net income attributed to shareholders (post-tax)   (783)  
Lapses and policyholder behavior [Member] | Canada [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   315  
Lapses and policyholder behavior [Member] | Canada [Member] | Segregated funds [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   242  
Lapses and policyholder behavior [Member] | Japan [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   226  
Other updates [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities   (220) 162
Change in net income attributed to shareholders (post-tax)   301 (73)
Other updates [Member] | ALDA and Public Equity Investment Return Assumptions [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   892  
Other updates [Member] | Corporate Spread Assumptions [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   344  
Other updates [Member] | U.S [Member] | Refinements To Liability and Tax Cash Flows [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net income attributed to shareholders (post-tax)   CAD 696  
JH Long Term Care triennial review [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities     696
Change in net income attributed to shareholders (post-tax)     (452)
Contract liabilities benefits     CAD 1,000
Percentage of premium increase due to changes in actuarial assumptions     20.00%
Economic reinvestment assumptions [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Change in net insurance and investment contract liabilities     CAD 443
Change in net income attributed to shareholders (post-tax)     (313)
Bottom of range [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Percentage provision for adverse deviation assumptions not specifically provided 5.00% 5.00%  
Top of range [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Percentage provision for adverse deviation assumptions not specifically provided 20.00% 20.00%  
MLI and John Hancock Life Insurance Company [Member]      
Disclosure of insurance contract liabilities and reinsurance assets [line items]      
Assets and insurance contract liabilities related to closed blocks participating policies CAD 28,135 CAD 28,135 CAD 29,108