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Stock-Based Compensation - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2017
CAD
Equity
Options
CAD / shares
shares
Dec. 31, 2016
CAD
Equity
Options
CAD / shares
Dec. 31, 2015
Equity
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Compensation expense   CAD 16,000,000 CAD 19,000,000  
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   CAD 5.18 CAD 3.78  
Risk-free interest rate   1.25% 1.50%  
Dividend yield   3.00% 3.00%  
Expected volatility   29.50% 29.50%  
Expected life   6 years 8 months 12 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   610,000 633,000  
Deferred Share Units [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Compensation expense   CAD 13,000,000 CAD 6,000,000  
Number of equity granted   23,000 14,000  
Number of other equity instruments entitle holder to receive payment in cash | Options   1,103,000 1,235,000  
Number of other equity entitle holder to receive payment in cash or common shares | Options   932,000 814,000  
Amount of the liability relating to equity   CAD 53,000,000 CAD 43,000,000  
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   0 27,000  
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   43,000 83,000  
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   156,000 254,000  
Number of shares outstanding | Equity   2,645,000 2,682,000 2,542,000
Fair value of equity granted | CAD / shares   CAD 26.22 CAD 23.91  
Deferred Share Units [Member] | Bottom of range [Member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Vesting period   34 months 4 years  
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   CAD 125,000,000 CAD 110,000,000  
Vesting period 34 months      
Number of equity granted   5,600,000 7,600,000  
Fair value of equity granted | CAD / shares   CAD 26.22 CAD 23.91  
Vesting date Dec. 15, 2019      
Performance share units (PSUs) [member]        
Disclosure of terms and conditions of share-based payment arrangement [Line Items]        
Compensation expense   CAD 21,000,000 CAD 9,000,000  
Vesting period 36 months      
Number of equity granted   1,000,000 1,200,000  
Fair value of equity granted | CAD / shares   CAD 26.22 CAD 23.91  
Vesting date Feb. 28, 2020      
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   CAD 228,000,000 CAD 196,000,000