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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 |

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