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Invested Assets and Investment Income - Summary of Fair Values and the Fair Value Hierarchy (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Carrying value [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | $ 112,233 | $ 108,058
Carrying value [Member] | Mortgages [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 50,207 | 49,376
Carrying value [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 40,756 | 37,979
Carrying value [Member] | Policy loans [member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 6,398 | 6,471
Carrying value [Member] | Loans to Bank clients [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 1,976 | 1,740
Carrying value [Member] | Real estate own use property [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 1,850 | 1,926
Carrying value [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Carrying value | 11,046 | 10,566
Fair value [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 125,420 | 116,027
Fair value [Member] | Mortgages [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 54,230 | 51,450
Fair value [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 47,890 | 41,743
Fair value [Member] | Policy loans [member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 6,398 | 6,471
Fair value [Member] | Loans to Bank clients [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 1,982 | 1,742
Fair value [Member] | Real estate own use property [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 3,017 | 3,275
Fair value [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 11,903 | 11,346
Level 1 [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 128 | 165
Level 1 [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 128 | 165
Level 2 [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 49,778 | 44,447
Level 2 [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 41,398 | 36,234
Level 2 [Member] | Policy loans [member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 6,398 | 6,471
Level 2 [Member] | Loans to Bank clients [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 1,982 | 1,742
Level 3 [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 75,514 | 71,415
Level 3 [Member] | Mortgages [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 54,230 | 51,450
Level 3 [Member] | Private placements [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 6,492 | 5,509
Level 3 [Member] | Real estate own use property [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | 3,017 | 3,275
Level 3 [Member] | Other invested assets [Member] |  |
Disclosure of financial assets [Line Items] |  |
Total fair value | $ 11,775 | $ 11,181

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