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Subordinated Debt - Obligations Included in Subordinated Debt (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 19, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings term |  | 5 years |
Subordinated debt |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings outstanding |  | $ 6,425 | $ 4,781
Fair value of borrowings outstanding |  | 6,675 | 5,190
Interest expense on subordinated debt |  | $ 141 | 131
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 February 19, 2016 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 3.10% |
Borrowings outstanding |  | $ 0 | 350
Repayments of subordinated liabilities | $ 350 |  |
Subordinated Debt Issued September 19, 2016 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 3.05% |
Borrowings outstanding |  | $ 998 | 997
Subordinated Debt Issued November 23, 2017 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 2.75% |
Borrowings outstanding |  | $ 400 | 399
Subordinated Debt Issued August 13, 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 2.38% |
Borrowings outstanding |  | $ 748 | 747
Subordinated Debt Issued May 8, 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 2.58% |
Borrowings outstanding |  | $ 995 | 995
Adjustment to interest rate basis |  | 1.66% |
Subordinated Debt Issued October 1, 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 2.06% |
Borrowings outstanding |  | $ 746 | 745
Adjustment to interest rate basis |  | 1.03% |
Subordinated Debt Issued November 18, 2021, Redemption November 18, 2026 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 2.46% |
Borrowings outstanding |  | $ 497 | 0
Subordinated Debt Issued November 18, 2021, Redemption November 21, 2028 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 2.80% |
Borrowings outstanding |  | $ 995 | 0
Adjustment to interest rate basis |  | 0.69% |
Subordinated Debt Issued November 18, 2021, Redemption November 18, 2031 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Interest rate |  | 3.15% |
Borrowings outstanding |  | $ 498 | $ 0
Adjustment to interest rate basis |  | 0.91% |
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 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% |
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued August 13, 2019 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis |  | 0.85% |
After earliest par call or redemption date | Canadian Dollar Offered Rate (CDOR) | Subordinated Debt Issued November 18, 2021, Redemption November 18, 2026 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis |  | 0.44% |
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 May 8, 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis |  | 0.52% |
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued October 1, 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis |  | 0.38% |
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued November 18, 2021, Redemption November 21, 2028 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis |  | 0.285% |
Before earliest par call or redemption date | Government of Canada Bond Yield | Subordinated Debt Issued November 18, 2021, Redemption November 18, 2031 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Adjustment to interest rate basis |  | 0.335% |

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