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Stock-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2023
Mar. 31, 2022
Dec. 31, 2022
CAD ($)
Options
Equity
$ / shares
shares
Dec. 31, 2021
CAD ($)
Equity
Options
$ / shares
Dec. 31, 2020
Equity
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense     $ 5 $ 9  
Number of options, Granted     0 0  
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     166,000 188,000  
Deferred Share Units [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense     $ 7 $ 6  
Number of equity granted     30,000 34,000  
Number of other equity instruments entitle holder to receive payment in cash | Options     977,000 840,000  
Number of other equity entitle holder to receive payment in cash or common shares | Options     1,230,000 1,051,000  
Number of other equity instruments entitle holder to receive payment in common shares | Equity     166,000 188,000  
Number of equity granted under the member deferred share units under ESOP | Equity     116,000 101,000  
Amount of the liability relating to equity     $ 53 $ 46  
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     106,000 26,000  
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     252,000 161,000  
Number of shares outstanding | Equity     2,373,000 2,079,000 2,169,000
Fair value of equity granted | $ / shares     $ 24.15 $ 24.11  
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     $ 158 $ 135  
Vesting period   36 months      
Number of equity granted     8,600,000 6,800,000  
Fair value of equity granted | $ / shares     $ 24.15 $ 24.11  
Grant date     March 31 2022    
Performance share units (PSUs) [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense     $ 23 $ 31  
Vesting period 36 months        
Number of equity granted     1,700,000 1,500,000  
Grant date     March 31 2022    
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     $ 388 $ 362