XML 181 R146.htm IDEA: XBRL DOCUMENT
v3.20.4

Employee Future Benefits - Summary of Potential Impact on Obligations Arising From Changes in Key Assumptions (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020
U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Decrease in mortality rates | 10.00%
Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Decrease in mortality rates | 10.00%
Male [Member] | U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days
Male [Member] | Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 8 months 12 days
Female [Member] | U.S. [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days
Female [Member] | Canada [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Increase in life expectancy due to decrease in mortality rate | 9 months 18 days

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Actuarial assumptions increase in life expectancy at age sixty five due to ten percent decrease in mortality rate. + References No definition available. + Details
Name: | mfc_ActuarialAssumptionsIncreaseInLifeExpectancyAtAgeSixtyFiveDueToTenPercentDecreaseInMortalityRate
Namespace Prefix: | mfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Decrease in mortality rate. + References No definition available. + Details
Name: | mfc_DecreaseInMortalityRate
Namespace Prefix: | mfc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RedesignationAxis=mfc_MaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RedesignationAxis=mfc_FemaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |