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Subordinated Debt - Obligations Included in Subordinated Debt (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 02, 2017
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 January 30, 2008 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 5.59% |  |
Borrowings outstanding | $ 0 | 400 |
Subordinated Debt Issued March 2, 2012 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  |  | 4.38%
Borrowings outstanding | $ 0 | 0 | $ 800
Subordinated Debt Issued May 13, 2014 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.77% |  |
Borrowings outstanding | $ 250 | 249 |
Subordinated Debt Issued September 25, 2015 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.60% |  |
Borrowings outstanding | $ 499 | 498 |
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 | $ 995 | 995 |
Subordinated Debt Issued November 23, 2017 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate | 2.75% |  |
Borrowings outstanding | $ 398 | 398 |
Subordinated Debt |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings outstanding | 3,039 | 3,437 |
Fair value of borrowings outstanding | 3,129 | 3,583 |
Interest expense on subordinated debt | $ 105 | $ 122 |
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 May 13, 2014 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis | 0.75% |  |
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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