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Derivative and Hedging Instruments - Summary of Effects of Derivatives Not Designated in Qualifying Hedge Accounting Relationships (Detail) - Non designated [Member] - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | $ 1,173 | $ (10,634)
Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | 667 | (3,428)
Interest rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | 57 | (431)
Interest rate options [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (13) | (258)
Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (4) | 1,171
Currency rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (22) | (103)
Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | 612 | (7,561)
Equity futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (449) | 794
Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | $ 325 | $ (818)

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