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Derivative and Hedging Instruments - Investment Income (Loss) on Derivatives Not Designated in Qualifying Hedge Accounting Relationships (Details) - Derivatives not designated in qualifying hedge accounting relationships - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | $ (726) | $ 1,173
Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | (116) | 667
Interest rate futures |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | 52 | 57
Interest rate options |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | (20) | (13)
Foreign currency swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | 108 | (4)
Currency rate futures |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | (137) | (22)
Forward contracts |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | (626) | 612
Equity futures |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | (423) | (449)
Equity contracts |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | 437 | 325
Derivatives not designated in qualifying hedge accounting relationships | Credit default swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative investment income (loss) | $ (1) | $ 0

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