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Financial Instrument Risk Management - Maximum Exposure to Credit Risk (Details) - CAD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Credit risk | Loans
Disclosure of credit risk exposure [line items]
Loan commitments	$ 2,061	$ 2,217

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- 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.

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No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Maximum Exposure To Credit Risk, Off-Balance Sheet

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No definition available.

+ Details

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

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- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_LoanCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: