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Stock-Based Compensation - Additional Information (Detail)
 12 Months Ended
Feb. 28, 2021
Dec. 31, 2021
CAD ($)
Options
Equity
$ / shares
shares
Dec. 31, 2020
CAD ($)
Equity
Options
$ / shares
Dec. 31, 2020
CAD ($)
Equity
Options
$ / shares
Dec. 31, 2019
Equity
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense   $ 9,000,000 $ 14,000,000    
Number of options, Granted   0 5,000,000    
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     $ 3.66 $ 3.66  
Risk-free interest rate     1.50%    
Dividend yield     3.50%    
Expected volatility     23.00%    
Expected life     8 years    
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      
Number of shares outstanding | Equity   188,000 285,000 285,000  
Deferred Share Units [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense   $ 6,000,000 $ 5,000,000    
Fair value of equity issued | Equity   101,000 145,400    
Number of equity granted   34,000 28,000    
Number of other equity instruments entitle holder to receive payment in cash | Options   840,000 811,000 811,000  
Number of other equity entitle holder to receive payment in cash or common shares | Options   1,051,000 1,073,000 1,073,000  
Amount of the liability relating to equity   $ 46,000,000 $ 43,000,000 $ 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   26,000 38,000    
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   0 2,600    
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   161,000 214,000    
Number of shares outstanding | Equity   2,079,000 2,169,000 2,169,000 2,395,000
Fair value of equity granted | $ / shares   $ 24.11 $ 22.65    
Deferred Share Units [Member] | Bottom of range [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Vesting period     36 months    
Restricted share units (RSUs) [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense   $ 135,000,000 $ 140,000,000    
Vesting period 36 months        
Number of equity granted   6,800,000 6,700,000    
Fair value of equity granted | (per share)   $ 24.11   $ 22.65  
Grant date   February 20 2021      
Performance share units (PSUs) [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense   $ 31,000,000 $ 15,000,000    
Vesting period 36 months        
Number of equity granted   1,500,000 1,100,000    
Grant date   February 20 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   $ 362,000,000 $ 194,000,000 $ 194,000,000