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Subordinated Debt - Obligations Included in Subordinated Debt (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Sun Life Assurance Subordinated Debt Issued May 15, 1998 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 6.30% |
Borrowings outstanding | $ 150 | $ 150
Subordinated Debt Issued May 29, 2007 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.40% |
Borrowings outstanding | $ 398 | 398
Subordinated Debt Issued May 13, 2014 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 2.77% |
Borrowings outstanding | $ 0 | 250
Subordinated Debt Issued September 25, 2015 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 2.60% |
Borrowings outstanding | $ 500 | 499
Subordinated Debt Issued February 19, 2016 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 3.10% |
Borrowings outstanding | $ 349 | 349
Subordinated Debt Issued September 19, 2016 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 3.05% |
Borrowings outstanding | $ 996 | 995
Subordinated Debt Issued November 23, 2017 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 2.75% |
Borrowings outstanding | $ 399 | 398
Subordinated Debt Issued August 7, 2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 2.38% |
Borrowings outstanding | $ 746 | 0
Adjustment to interest rate basis | 0.85% |
Subordinated Debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings outstanding | $ 3,538 | 3,039
Fair value of borrowings outstanding | 3,727 | 3,129
Interest expense on subordinated debt | $ 105 | $ 105
Government of Canada Bond Yield | Sun Life Assurance Subordinated Debt Issued May 15, 1998 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 0.16% |
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued May 29, 2007 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 1.00% |
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued September 25, 2015 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 1.43% |
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued February 19, 2016 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 2.20% |
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued September 19, 2016 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 1.85% |
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued November 23, 2017 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 0.74% |
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued May 29, 2007 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 0.25% |
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued September 19, 2016 |  |
Disclosure of detailed information about borrowings [line items] |  |
Adjustment to interest rate basis | 0.52% |

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