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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, 2023
Dec. 31, 2023
CAD ($)
Equity
Options
shares
$ / shares
Dec. 31, 2022
CAD ($)
Equity
Options
shares
$ / shares
Dec. 31, 2021
Equity
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense     $ 2 $ 5  
Number of options, Granted     0    
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       30,000  
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     143,000 166,000  
Deferred Share Units [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense     $ 9 $ 7  
Number of equity granted     38,000    
Number of other equity instruments entitle holder to receive payment in cash | Options     913,000 977,000  
Number of other equity entitle holder to receive payment in cash or common shares | Options     907,000 1,230,000  
Number of other equity instruments entitle holder to receive payment in common shares | Equity     143,000 166,000  
Number of equity granted under the member deferred share units under ESOP | Equity     117,000 116,000  
Amount of the liability relating to equity     $ 62 $ 53  
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     33,000 106,000  
Deferred Share Units [Member] | Defer Payment Of All Or Part Of RSUs [Member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Number of equity granted | shares     18,000 0  
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     206,000 252,000  
Number of shares outstanding | Equity     1,963,000 2,373,000 2,079,000
Fair value of equity granted | $ / shares     $ 29.28 $ 24.15  
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     $ 207 $ 158  
Vesting period   36 months      
Number of equity granted     8,500,000 8,600,000  
Fair value of equity granted | $ / shares     $ 29.28 $ 24.15  
Grant date     March 31 2023    
Performance share units (PSUs) [member]          
Disclosure of terms and conditions of share-based payment arrangement [Line Items]          
Compensation expense     $ 45 $ 23  
Vesting period 36 months        
Number of equity granted     1,600,000 1,700,000  
Grant date     March 31 2023    
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     $ 514 $ 388