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Senior Debentures and Innovative Capital Instruments - Narrative (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Senior Debentures
Disclosure of detailed information about borrowings [line items]
Interest expense on subordinated debt	$ 14	$ 14
Sun Life ExchangEable Capital Securities | Non-Cumulative Perpetual Preferred Shares
Disclosure of detailed information about borrowings [line items]
Borrowings, convertible, number of equity instruments (in shares)	40

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The amount of interest expense on debt instruments issued. [Refer: Interest expense; Debt instruments issued]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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Borrowings, Convertible, Number Of Equity Instruments

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