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Commitments, Guarantees and Contingencies - Lease Commitments, Contractual Commitments, and Letters of Credit (Details) - CAD ($)	Dec. 31, 2024	Dec. 31, 2023
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]
Maximum borrowing capacity	$ 1,077,000,000	$ 874,000,000
Letters of credit outstanding	$ 120,000,000	$ 113,000,000

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- Definition

Letters Of Credit Outstanding, Amount1

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No definition available.

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Namespace Prefix:	slf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Line Of Credit Facility, Maximum Borrowing Capacity1

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No definition available.

+ Details

Name:	slf_LineOfCreditFacilityMaximumBorrowingCapacity1
Namespace Prefix:	slf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]

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No definition available.

+ Details

Name:	slf_OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
Namespace Prefix:	slf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration