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Capital Instruments - Schedule of Carrying Value of Capital Instruments (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
SGD ($)
Dec. 31, 2017
CAD ($)
Carrying value of capital instruments [line items]        
Par value $ 414,734,000,000     $ 336,773,000,000
Total $ 8,732,000,000     8,387,000,000
JHFC subordinated notes [member]        
Carrying value of capital instruments [line items]        
Issuance date Dec. 14, 2006      
Maturity date Dec. 15, 2036      
Par value $ 650      
Total $ 647,000,000     647,000,000
4.061% MFC subordinated notes [member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 4.061% 4.061% 4.061%  
Issuance date Feb. 24, 2017      
Earliest par redemption date Feb. 24, 2027      
Maturity date Feb. 24, 2032      
Par value   $ 750    
Total $ 1,017,000,000     935,000,000
7.375% JHUSA Surplus notes [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 7.375% 7.375% 7.375%  
Issuance date Feb. 25, 1994      
Maturity date Feb. 15, 2024      
Par value   $ 450    
Total $ 632,000,000     584,000,000
7.535% MFCT II Senior debenture notes [member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 7.535% 7.535% 7.535%  
Issuance date Jul. 10, 2009      
Earliest par redemption date Dec. 31, 2019      
Maturity date Dec. 31, 2018      
Par value $ 1,000      
Total $ 1,000,000,000     1,000,000,000
3.00% MFC subordinated notes [member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 3.00% 3.00% 3.00%  
Issuance date Nov. 21, 2017      
Earliest par redemption date Nov. 21, 2024      
Maturity date Nov. 21, 2029      
Par value     $ 500  
Total $ 498,000,000     467,000,000
3.049% MFC Subordinated debentures [member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 3.049% 3.049% 3.049%  
Issuance date Aug. 17, 2017      
Earliest par redemption date Aug. 20, 2024      
Maturity date Aug. 20, 2029      
Par value $ 750      
Total $ 747,000,000     746,000,000
3.317% MFC Subordinated debentures [member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 3.317% 3.317% 3.317%  
Issuance date May 09, 2018      
Earliest par redemption date May 09, 2023      
Maturity date May 09, 2028      
Par value $ 600      
Total $ 597,000,000      
3.181% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 3.181% 3.181% 3.181%  
Issuance date Nov. 20, 2015      
Earliest par redemption date Nov. 22, 2022      
Maturity date Nov. 22, 2027      
Par value $ 1,000      
Total $ 997,000,000     996,000,000
3.85% MFC Subordinated notes [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 3.85% 3.85% 3.85%  
Issuance date May 25, 2016      
Earliest par redemption date May 25, 2021      
Maturity date May 25, 2026      
Par value     $ 500  
Total $ 499,000,000     467,000,000
2.389% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 2.389% 2.389% 2.389%  
Issuance date Jun. 01, 2015      
Earliest par redemption date Jan. 05, 2021      
Maturity date Jan. 05, 2026      
Par value $ 350      
Total $ 349,000,000     349,000,000
2.10% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 2.10% 2.10% 2.10%  
Issuance date Mar. 10, 2015      
Earliest par redemption date Jun. 01, 2020      
Maturity date Jun. 01, 2025      
Par value $ 750      
Total $ 749,000,000     748,000,000
2.64% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 2.64% 2.64% 2.64%  
Issuance date Dec. 01, 2014      
Earliest par redemption date Jan. 15, 2020      
Maturity date Jan. 15, 2025      
Par value $ 500      
Total $ 500,000,000     499,000,000
2.811% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 2.811% 2.811% 2.811%  
Issuance date Feb. 21, 2014      
Earliest par redemption date Feb. 21, 2019      
Maturity date Feb. 21, 2024      
Par value $ 500      
Total $ 500,000,000     499,000,000
2.926% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 2.926% 2.926% 2.926%  
Issuance date Nov. 29, 2013      
Earliest par redemption date Nov. 29, 2018      
Maturity date Nov. 29, 2023      
Par value $ 250      
Total       250,000,000
2.819% MLI Subordinated debentures [Member]        
Carrying value of capital instruments [line items]        
Capital instruments interest rate 2.819% 2.819% 2.819%  
Issuance date Feb. 25, 2013      
Earliest par redemption date Feb. 26, 2018      
Maturity date Feb. 26, 2023      
Par value $ 200      
Total       $ 200,000,000