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Stock-Based Compensation - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2018 | Dec. 31, 2018 CAD ($) Equity Options $ / shares shares | Dec. 31, 2017 CAD ($) Equity Options $ / shares shares | Dec. 31, 2016 Equity
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Compensation expense |  | $ 9,000,000 | $ 16,000,000 |
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 |  | $ 4.97 | $ 5.18 |
Risk-free interest rate |  | 2.00% | 1.25% |
Dividend yield |  | 3.25% | 3.00% |
Expected volatility |  | 28.00% | 29.50% |
Expected life |  | 6 years 3 months 18 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 |  | 337,000 | 610,000 |
Deferred Share Units [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Compensation expense |  | $ 6,000,000 | $ 13,000,000 |
Number of equity granted |  | 55,000 | 23,000 |
Number of other equity instruments entitle holder to receive payment in cash | Options |  | 1,151,000 | 1,103,000 |
Number of other equity entitle holder to receive payment in cash or common shares | Options |  | 1,050,000 | 932,000 |
Amount of the liability relating to equity |  | $ 43,000,000 | $ 53,000,000 |
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 |  | 8,000 | 0 |
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 | 43,000 |
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 |  | 141,000 | 156,000 |
Number of shares outstanding | Equity |  | 2,538,000 | 2,645,000 | 2,682,000
Fair value of equity granted | $ / shares |  | $ 19.37 | $ 26.22 |
Deferred Share Units [Member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Vesting period |  | 34 months | 34 months |
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 |  | $ 111,000,000 | $ 125,000,000 |
Vesting period | 34 months |  |  |
Number of equity granted |  | 5,500,000 | 5,600,000 |
Fair value of equity granted | $ / shares |  | $ 19.37 | $ 26.22 |
Vesting date | Dec. 15, 2020 |  |  |
Performance share units (PSUs) [member] |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Compensation expense |  | $ 14,000,000 | $ 21,000,000 |
Vesting period | 36 months |  |  |
Number of equity granted |  | 800,000 | 1,000,000 |
Fair value of equity granted | $ / shares |  | $ 19.37 | $ 26.22 |
Vesting date | Feb. 28, 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 |  | $ 128,000,000 | $ 228,000,000 |

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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