XML 90 R55.htm IDEA: XBRL DOCUMENT
v3.20.4

Nature of Operations and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020
Bottom of range [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Estimated useful life of property | 30 years
Finite -Lived intangible assets, useful life | 6 years
Capital asset, useful life | 2 years
Bottom of range [Member] | Software [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Finite -Lived intangible assets, useful life | 3 years
Top of range [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Estimated useful life of property | 60 years
Finite -Lived intangible assets, useful life | 68 years
Capital asset, useful life | 10 years
Top of range [Member] | Software [Member] |
Disclosure of changes in accounting estimates [Line Items] |
Finite -Lived intangible assets, useful life | 10 years

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_DisclosureOfChangesInAccountingEstimatesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Capital asset useful life. + References No definition available. + Details
Name: | mfc_CapitalAssetUsefulLife
Namespace Prefix: | mfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Finite lived intangible asset useful life. + References No definition available. + Details
Name: | mfc_FiniteLivedIntangibleAssetUsefulLife1
Namespace Prefix: | mfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Property plant and equipment estimated useful life. + References No definition available. + Details
Name: | mfc_PropertyPlantAndEquipmentEstimatedUsefulLife
Namespace Prefix: | mfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |