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Insurance Contract Liabilities and Reinsurance Assets - Additional Information (Detail) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Feb. 07, 2019
Oct. 31, 2018
Jul. 01, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Fair value of assets backing net insurance contract liabilities excluding reinsurance assets       $ 278,521 $ 287,326 $ 278,521
Fair value of assets backing capital and other liabilities       456,278 465,497 456,278
Change in insurance and investment contract liabilities         (174) 277
Change in net income attributed to shareholders (post-tax)         (51) (35)
Change in net income attributed to shareholders       2,800 (62)  
Coinsurance, after tax loss     $ 74      
Ceded premiums     3,700      
Increase of reinsurance assets     $ 3,600   (9,733) 2,269
Quota share coinsurance agreements, percentage     100.00%      
Jackson National Life Insurance Company [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Ceded premiums   $ 7,000        
Increase of reinsurance assets   $ 7,500        
Quota share coinsurance agreements, percentage   100.00%        
Coinsurance, after tax gain   $ 142,000        
Mortality and morbidity updates [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities         319 (254)
Change in net income attributed to shareholders (post-tax)         (360) 299
Change in net income attributed to shareholders         (511)  
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
Lapses and policyholder behavior [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities         287 1,019
Change in net income attributed to shareholders (post-tax)         (226) (783)
Change in net income attributed to shareholders         (287)  
Lapses and policyholder behavior [member] | U.S. [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in net income attributed to shareholders (post-tax)         (252)  
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)
Investment return assumptions [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities         (96)  
Change in net income attributed to shareholders (post-tax)         143  
Change in net income attributed to shareholders         146  
Investment return assumptions [member] | Bond default rates [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in net income attributed to shareholders (post-tax)         401  
Investment return assumptions [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)         (210)  
Investment return assumptions [member] | Other refinements [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in net income attributed to shareholders (post-tax)         (48)  
Other updates [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities         (684)  
Change in net income attributed to shareholders (post-tax)         392 449
Change in net income attributed to shareholders         $ 590  
Other updates [member] | ALDA and Public Equity Investment Return Assumptions [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities           1,296
Change in net income attributed to shareholders (post-tax)           (892)
Other updates [member] | Other refinements [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities           (220)
Change in net income attributed to shareholders (post-tax)           301
Other updates [member] | Corporate Spread Assumptions [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities           (515)
Change in net income attributed to shareholders (post-tax)           344
Other updates [member] | Refinements To Liability and Tax Cash Flows [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Change in insurance and investment contract liabilities           (1,049)
Change in net income attributed to shareholders (post-tax)           696
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)           696
Scenario Forecast [member]            
Disclosure of insurance contract liabilities and reinsurance assets [line items]            
Reinsurance transaction, after-tax gain $ 80          
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%  
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%  
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       $ 28,135 $ 28,790 $ 28,135