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v3.10.0.1

Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items] |
Intangible asset useful life | 40 years
Owner-occupied properties | Bottom of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Property useful life | 25 years
Owner-occupied properties | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Property useful life | 49 years
Furniture, computers, and other office equipment, and leasehold improvements | Bottom of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Property useful life | 2 years
Furniture, computers, and other office equipment, and leasehold improvements | Top of range |
Disclosure of detailed information about property, plant and equipment [line items] |
Property useful life | 20 years

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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 Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period + 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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- Definition Useful Lives Or Depreciation Rates, Property, Plant And Equipment, Period + References No definition available. + Details
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Namespace Prefix: | slf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Details
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Namespace Prefix: |
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Period Type: |

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

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=slf_FurnitureComputersAndOtherOfficeEquipmentAndLeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |