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Acquisitions and Other - Acquisitions and Other (Details) $ in Millions, $ in Millions | Feb. 01, 2021 CAD ($) | Nov. 18, 2020 CAD ($) | Oct. 03, 2021 CAD ($) | Oct. 03, 2021 USD ($)
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Disclosure of detailed information about business combination [line items] |  |  |  |
Increase in invested assets | $ 480 |  |  |
DentaQuest Group, Inc |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Consideration transferred, acquisition-date fair value |  |  | $ 3,100 | $ 2,475
FWD |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Net proceeds from business acquisition | 17 |  |  |
Increase in contract liabilities | $ 480 |  |  |
ACB |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Consideration transferred, acquisition-date fair value |  | $ 471 |  |
Bancassurance partnership, term |  | 15 years |  |

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