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Invested Assets and Investment Income - Summary of Invested Assets and Segregated Funds Net Assets, Measured at Fair Value (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | $ 45,680 | $ 42,803 | $ 35,291
Net asset value [member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets | $ 27,532 |  |
Bottom of range [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Investment properties capitalization rates | 2.72% | 2.25% |
Investment properties terminal capitalization rates | 3.00% | 3.25% |
Bottom of range [Member] | Real estate 1 [member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Investment property discount rates | 3.20% | 3.30% |
Top of range [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Investment properties capitalization rates | 10.75% | 9.00% |
Investment properties terminal capitalization rates | 10.00% | 9.50% |
Top of range [Member] | Real estate 1 [member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Investment property discount rates | 14.00% | 11.00% |
Power and infrastructure [Member] | Bottom of range [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets fair value discount rate | 7.35% | 7.15% |
Power and infrastructure [Member] | Top of range [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets fair value discount rate | 15.60% | 15.60% |
Timberland Investment [Member] | Bottom of range [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets fair value discount rate | 4.00% | 4.25% |
Timberland Investment [Member] | Top of range [Member] |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Other invested assets fair value discount rate | 7.00% | 7.00% |

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