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Invested Assets and Investment Income - Summary of Invested Assets and Segregated Funds Net Assets, Measured at Fair Value (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Bottom of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Investment properties capitalization rates | 2.25% | 2.25%
Investment properties terminal capitalization rates | 3.25% | 3.25%
Bottom of range [Member] | Real estate 1 [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Investment property discount rates | 3.30% | 3.80%
Top of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Investment properties capitalization rates | 9.00% | 9.00%
Investment properties terminal capitalization rates | 9.50% | 9.25%
Top of range [Member] | Real estate 1 [member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Investment property discount rates | 11.00% | 10.50%
Power and infrastructure [Member] | Bottom of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets fair value discount rate | 7.15% | 7.25%
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% | 20.00%
Timberland Investment [Member] | Bottom of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Other invested assets fair value discount rate | 4.25% | 4.50%
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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