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Commitments, Guarantees and Contingencies - Legal and Regulatory Proceedings (Details) | 12 Months Ended
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Dec. 31, 2018 claim
Pending Litigation |
Entity Information [Line Items] |
Number of putative class action lawsuits | 2

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
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- Definition Loss Contingency, Pending Claims, Number1 + References No definition available. + Details
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Namespace Prefix: | slf_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |