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Invested Assets and Investment Income - Summary of Fair Values and the Fair Value Hierarchy (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Carrying value [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | $ 127,186 | $ 117,897
Carrying value [Member] | Mortgages [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 54,638 | 52,014
Carrying value [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 47,057 | 42,842
Carrying value [Member] | Policy loans [member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 6,894 | 6,397
Carrying value [Member] | Loans to Bank clients [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 2,781 | 2,506
Carrying value [Member] | Real estate own use property [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 1,878 | 1,812
Carrying value [Member] | Public bonds HTM [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 1,411 | 1,320
Carrying value [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 12,527 | 11,006
Fair value [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 120,397 | 126,274
Fair value [Member] | Mortgages [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 51,429 | 54,089
Fair value [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 41,968 | 47,276
Fair value [Member] | Policy loans [member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 6,894 | 6,397
Fair value [Member] | Loans to Bank clients [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 2,760 | 2,503
Fair value [Member] | Real estate own use property [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 3,033 | 3,024
Fair value [Member] | Public bonds HTM [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 1,000 | 1,320
Fair value [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 13,313 | 11,665
Level 1 [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 72 | 120
Level 1 [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 72 | 120
Level 2 [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 44,764 | 52,330
Level 2 [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 34,110 | 42,110
Level 2 [Member] | Policy loans [member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 6,894 | 6,397
Level 2 [Member] | Loans to Bank clients [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 2,760 | 2,503
Level 2 [Member] | Public bonds HTM [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 1,000 | 1,320
Level 2 [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 0 |
Level 3 [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 75,561 | 73,824
Level 3 [Member] | Mortgages [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 51,429 | 54,089
Level 3 [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 7,858 | 5,166
Level 3 [Member] | Real estate own use property [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 3,033 | 3,024
Level 3 [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | $ 13,241 | $ 11,545

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