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Senior Debentures and Innovative Capital Instruments - Senior Debentures (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 23, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about borrowings [line items] |  |  |
Redemption of debentures |  | $ 650 | $ 500
Senior Debentures |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings outstanding |  | 200 | 500
Fair value of borrowings outstanding |  | $ 271 | 590
SLF Inc. Series E Senior Debentures Issued August 23, 2011 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 4.57% |
Borrowings outstanding |  | $ 0 | 300
Redemption of debentures | $ 300 |  |
Sun Life Assurance Series B Senior Debentures Issued June 25, 2002 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 7.09% |
Borrowings outstanding |  | $ 200 | $ 200
Government of Canada Bond Yield | SLF Inc. Series E Senior Debentures Issued August 23, 2011 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis |  | 0.53% |
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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