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Capital Instruments - Schedule of Carrying Value of Capital Instruments (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Carrying value of capital instruments [line items]    
Interest rate, basis 5-year Singapore Dollar Swap Rate plus a specified number of basis points  
Interest rate reset period 5 years  
3.85% MFC Subordinated notes [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 1.97%  
3.049% MFC Subordinated debentures [Member]    
Carrying value of capital instruments [line items]    
Interest rate, basis 90-day Bankers' Acceptance rate plus 105 basis points.  
Floating interest rate, adjustment to basis 1.05%  
3.00% MFC Subordinated notes [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 0.832%  
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  
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%  
Manufacturers life insurance company [Member] | 2.819% 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 and is payable quarterly  
Floating interest rate, adjustment to basis 0.95%  
Manufacturers life insurance company [Member] | 2.926% MLI Subordinated debentures [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 0.85%  
Manufacturers life insurance company [Member] | 2.811% MLI Subordinated debentures [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 0.80%  
Manufacturers life insurance company [Member] | 2.64% MLI Subordinated debentures [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 0.73%  
Manufacturers life insurance company [Member] | 2.10% MLI Subordinated debentures [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 0.72%  
Manufacturers life insurance company [Member] | 2.389% MLI Subordinated debentures [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 0.83%  
Manufacturers life insurance company [Member] | 3.181% MLI Subordinated debentures [Member]    
Carrying value of capital instruments [line items]    
Floating interest rate, adjustment to basis 1.57%  
Manufacturers life insurance company [Member] | Government of Canada bonds [Member]    
Carrying value of capital instruments [line items]    
Debt instrument, maturity period 5 years 5 years
Floating interest rate, adjustment to basis 5.20% 5.20%
Manufacturers life insurance company [Member] | Government of Canada bonds [Member] | Prior to December 31, 2019 [Member]    
Carrying value of capital instruments [line items]    
Bond redemption variable interest rate 1.0325% 1.0325%
Manufacturers life insurance company [Member] | Government of Canada bonds [Member] | After December 31, 2019 [Member]    
Carrying value of capital instruments [line items]    
Bond redemption variable interest rate 2.065% 2.065%
John Hancock Financial Corporation [Member] | 7.375% JHUSA Surplus notes [Member]    
Carrying value of capital instruments [line items]    
Unamortized fair value increment $ 23 $ 26