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Senior Debentures and Innovative Capital Instruments - Innovative Capital Instruments (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Sun Life ExchangEable Capital Securities |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 200 | $ 200
Sun Life Capital Trust SLEECS B |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal amount | $ 200 |
Annual Yield | Sun Life Capital Trust SLEECS B |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual yield | 7.093% |
Government of Canada Bond Yield | Sun Life Capital Trust SLEECS B |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 0.32% |
Non-Cumulative Perpetual Preferred Shares | Sun Life ExchangEable Capital Securities |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, convertible, number of equity instruments (in shares) | 40 |
Non-Cumulative Perpetual Preferred Shares | Sun Life Capital Trust SLEECS B |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, convertible, number of equity instruments (in shares) | 40 |

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