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IFRS 7 Disclosures - Summary of Potential Impact to MLI's LICAT Total Ratio Resulting from Changes in Public Equity Market Values (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
-30% [member]
Statement [line items]
Impact on MLI's LICAT total ratio	(1)	(1)
-20% [member]
Statement [line items]
Impact on MLI's LICAT total ratio	(1)
20% [member]
Statement [line items]
Impact on MLI's LICAT total ratio	1	1
30% [member]
Statement [line items]
Impact on MLI's LICAT total ratio	1

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- Definition

Impact on Changes In Public Equity Market Value Percentage

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