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Senior Debentures and Innovative Capital Instruments - Senior Debentures (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]
Borrowings outstanding	$ 6,179	$ 6,178
Fair value of borrowings outstanding	6,179	5,888
Senior Debentures
Disclosure of detailed information about borrowings [line items]
Fair value of borrowings outstanding	$ 228	220
Sun Life Assurance Series B Senior Debentures Issued June 25, 2002
Disclosure of detailed information about borrowings [line items]
Interest rate	7.093%
Borrowings outstanding	$ 200	$ 200
Government of Canada Bond Yield | Sun Life Assurance Series B Senior Debentures Issued June 25, 2002
Disclosure of detailed information about borrowings [line items]
Adjustment to interest rate basis	0.32%

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The amount of outstanding funds that the entity is obligated to repay.

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