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Senior Debentures and Innovative Capital Instruments - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Senior Debentures |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest expense on subordinated debt | $ 23 | $ 28
Sun Life ExchangEable Capital Securities | Non-Cumulative Perpetual Preferred Shares |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, convertible, number of equity instruments (in shares) | 40 |

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