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Stock-Based Compensation - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Feb. 28, 2018
Dec. 31, 2018
CAD ($)
Equity
Options
$ / shares
shares
Dec. 31, 2017
CAD ($)
Equity
Options
$ / shares
shares
Dec. 31, 2016
Equity
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Compensation expense   $ 9,000,000 $ 16,000,000  
Black scholes option pricing model [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Weighted average fair value of options granted   $ 4.97 $ 5.18  
Risk-free interest rate   2.00% 1.25%  
Dividend yield   3.25% 3.00%  
Expected volatility   28.00% 29.50%  
Expected life   6 years 3 months 18 days 6 years 8 months 12 days  
Executive Stock Option Plan [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Description of share-based payment arrangement   The options provide the holder the right to purchase MFC common shares at an exercise price equal to the higher of the prior day, prior five-day or prior ten-day average closing market price of the shares on the Toronto Stock Exchange on the date the options are granted.    
Shares reserved for future issuance | shares   73,600,000    
Executive Stock Option Plan [Member] | Top of range [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Option vesting period   4 years    
Option expiration period   10 years    
Deferred Share Units under ESOP [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Vesting period   3 years    
Number of common shares to be received on retirement or termination | shares   1    
Fair value of equity issued   0 0  
Number of shares outstanding   337,000 610,000  
Deferred Share Units [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Compensation expense   $ 6,000,000 $ 13,000,000  
Number of equity granted   55,000 23,000  
Number of other equity instruments entitle holder to receive payment in cash | Options   1,151,000 1,103,000  
Number of other equity entitle holder to receive payment in cash or common shares | Options   1,050,000 932,000  
Amount of the liability relating to equity   $ 43,000,000 $ 53,000,000  
Deferred Share Units [Member] | Defer receipt of all or part of annual bonus [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Number of equity granted   8,000 0  
Deferred Share Units [Member] | Defer payment of all or part of RSUs or PSUs [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Number of equity granted   0 43,000  
Deferred Share Units [Member] | Board of Director [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Fair value of equity issued | Equity   141,000 156,000  
Number of shares outstanding | Equity   2,538,000 2,645,000 2,682,000
Fair value of equity granted | $ / shares   $ 19.37 $ 26.22  
Deferred Share Units [Member] | Bottom of range [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Vesting period   34 months 34 months  
Board of Director [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Shares reserved for future issuance | shares     1,000,000  
Restricted share units (RSUs) [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Compensation expense   $ 111,000,000 $ 125,000,000  
Vesting period 34 months      
Number of equity granted   5,500,000 5,600,000  
Fair value of equity granted | $ / shares   $ 19.37 $ 26.22  
Vesting date Dec. 15, 2020      
Performance share units (PSUs) [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Compensation expense   $ 14,000,000 $ 21,000,000  
Vesting period 36 months      
Number of equity granted   800,000 1,000,000  
Fair value of equity granted | $ / shares   $ 19.37 $ 26.22  
Vesting date Feb. 28, 2021      
Restricted share units and performance share units [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Amount of the liability relating to equity   $ 128,000,000 $ 228,000,000