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Insurance Contract Liabilities and Reinsurance Assets - Summary of Components of Gross and Net Insurance Contract Liabilities (Parenthetical) (Detail) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of insurance contract liabilities and reinsurance assets [abstract]
Reinsurance assets for investment contract liabilities	$ 128	$ 0

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- Definition

The amount of reinsurance contracts held that are liabilities. [Refer: Liabilities; Reinsurance contracts held [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2021-01-01
-Name IFRS
-Number 17
-IssueDate 2018-01-01
-Paragraph 78
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=17&date=2018-03-01&anchor=para_78_d&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2021-01-01
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 54
-Subparagraph ma
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_ma&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure of insurance contract liabilities and reinsurance assets abstract.

+ References

No definition available.

+ Details

Name:	mfc_DisclosureOfInsuranceContractLiabilitiesAndReinsuranceAssetsAbstract
Namespace Prefix:	mfc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration