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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, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | $ (10,634) | $ (5,928)
Interest rate swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (3,428) | (1,986)
Interest rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (431) | (687)
Interest rate options [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (258) | (133)
Foreign currency swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | 1,171 | (166)
Currency rate futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (103) | 66
Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | (7,561) | (1,751)
Equity futures [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | 794 | (2,140)
Equity contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) | $ (818) | 871
Credit default swaps [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Derivative investment income (loss) |  | $ (2)

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