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Employee Future Benefits - Summary of Components of Net Benefit Cost for Pension Plans and Retiree Welfare Plans (Parenthetical) (Detail) - Standard Life Plc [Member] - Defined Benefit Plans Provision [Member] $ in Millions	12 Months Ended
	Dec. 31, 2018 CAD ($)
Disclosure of defined benefit plans [Line Items]
Past service cost amendments	$ 8
Past service cost - curtailments	$ 22

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- 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

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- Definition

Past service cost curtailments, net defined benefit liability (asset).

+ References

No definition available.

+ Details

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- Definition

Past service cost plan amendments net defined benefit liability asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	mfc_
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- Details

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Period Type:

X

- Details

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