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Capital Instruments - Schedule of Carrying Value of Capital Instruments (Parenthetical) (Detail) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
May 25, 2021
Jan. 05, 2021
Carrying value of capital instruments [line items]        
Debt securities $ 6,980 $ 7,829    
On May 25, 2021 [Member]        
Carrying value of capital instruments [line items]        
Bond redemption variable interest rate     3.85%  
JHFC subordinated notes [member]        
Carrying value of capital instruments [line items]        
Interest rate, basis 90-day Bankers’ Acceptance rate plus 0.72%      
Floating interest rate, adjustment to basis 0.72%      
Debt securities $ 647 647    
JHFC subordinated notes [member] | Canadian Dollar Offered Rate [Member]        
Carrying value of capital instruments [line items]        
Debt securities 647      
JHFC subordinated notes [member] | Future Referencing Canadian Dollar Offered Rate [Member]        
Carrying value of capital instruments [line items]        
Debt securities 4,338      
JHFC subordinated notes [member] | US Dollar Mid Swaprate [Member]        
Carrying value of capital instruments [line items]        
Debt securities 947      
JHFC subordinated notes [member] | Singapore Swap Rate [Member]        
Carrying value of capital instruments [line items]        
Debt securities $ 469      
2.818% MFC Subordinated debentures [member]        
Carrying value of capital instruments [line items]        
Floating interest rate, adjustment to basis 1.82%      
Debt securities $ 995 995    
Earliest par redemption date May 13, 2030      
4.061% MFC subordinated notes [member]        
Carrying value of capital instruments [line items]        
Interest rate, basis 5-Year US Dollar Mid-Swap Rate plus 1.647%      
Floating interest rate, adjustment to basis 1.647%      
Interest rate reset period 5 years      
Debt securities $ 947 951    
Earliest par redemption date Feb. 24, 2027      
7.375% JHUSA Surplus notes [Member]        
Carrying value of capital instruments [line items]        
Debt securities $ 579 584    
3.00% MFC subordinated notes [member]        
Carrying value of capital instruments [line items]        
Interest rate, basis 5-Year Singapore Dollar Swap Rate plus 0.832%.      
Floating interest rate, adjustment to basis 0.832%      
Interest rate reset period 5 years      
Debt securities $ 469 480    
Earliest par redemption date Nov. 21, 2024      
3.049% MFC Subordinated debentures [member]        
Carrying value of capital instruments [line items]        
Interest rate, basis 90-day Bankers’ Acceptance rate plus a specified number of basis points.      
Floating interest rate, adjustment to basis 1.05%      
Debt securities $ 748 748    
Earliest par redemption date Aug. 20, 2024      
3.317% MFC Subordinated debentures [member]        
Carrying value of capital instruments [line items]        
Interest rate, basis 90-day Bankers’ Acceptance rate plus a specified number of basis points.      
Floating interest rate, adjustment to basis 0.78%      
Debt securities $ 599 598    
Earliest par redemption date May 09, 2023      
3.181% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Debt securities $ 999 999    
Earliest par redemption date Nov. 22, 2022      
3.85% MFC Subordinated notes [Member]        
Carrying value of capital instruments [line items]        
Debt securities   481    
Earliest par redemption date May 25, 2021      
2.389% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Bond redemption variable interest rate       2.389%
Debt securities   350    
Earliest par redemption date Jan. 05, 2021      
2.237% MFC Subordinated debentures [member]        
Carrying value of capital instruments [line items]        
Floating interest rate, adjustment to basis 1.49%      
Debt securities $ 997 996    
Earliest par redemption date May 12, 2025      
John Hancock Financial Corporation [Member] | 7.375% JHUSA Surplus notes [Member]        
Carrying value of capital instruments [line items]        
Unamortized fair value increment $ 9 $ 13    
Manufacturers life insurance company [Member] | 3.181% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Interest rate, basis 90-day Bankers’ Acceptance rate plus a specified number of basis points.      
Floating interest rate, adjustment to basis 1.57%