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Equity Capital and Earnings Per Share - Summary of Reconciliation of Denominator (Number of Shares) in Calculation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Share based payments arrangements [Member]
Earnings per share [Line Items]
Anti-dilutive stock-based awards excluded from the calculation of EPS	9	0

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Antidilutive securities with potential future dilutive effect not included in calculation of diluted earnings per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	mfc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: