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Insurance Contract Liabilities and Reinsurance Assets - Additional Information (Detail) $ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 15, 2021 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Sep. 30, 2022 CAD ($) | Sep. 30, 2022 USD ($)
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Fair value of assets backing net insurance contract liabilities excluding reinsurance assets |  | $ 317,854.0 |  | $ 354,587.0 |  |
Fair value of assets backing capital and other liabilities |  | 524,297.0 |  | 571,431.0 |  |
Change in insurance and investment contract liabilities |  | (80.0) |  | 287.0 |  |
Change in net income attributed to shareholders (post-tax) |  | 36.0 |  | (41.0) |  |
Coinsurance, after tax loss |  | 126.0 |  |  |  |
John Hancock Life Insurance Company [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Coinsurance, after tax loss |  |  |  | 40.0 |  |
Coinsurance transaction estimated after tax gain | $ 806.0 |  |  |  |  |
John Hancock Life Insurance Company USA [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Coinsurance, after tax gain |  | 846.0 |  |  |  |
Jackson National Life Insurance Company [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Coinsurance, after tax gain |  |  |  | 40.0 |  |
Mortality and morbidity updates [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  | 157.0 |  | 350.0 |  |
Change in net income attributed to shareholders (post-tax) |  | (126.0) |  | (257.0) |  |
Lapses and policyholder behavior [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  | 317.0 |  | 686.0 |  |
Change in net income attributed to shareholders (post-tax) |  | (192.0) |  | (534.0) |  |
Investment return assumptions [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  | (210.0) |  | (257.0) |  |
Change in net income attributed to shareholders (post-tax) |  | 157.0 |  | 168.0 |  |
Other updates [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  | (363.0) |  | 110.0 |  |
Change in net income attributed to shareholders (post-tax) |  | 212.0 |  | 119.0 |  |
Long term care triennial review [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  | 19.0 |  | 51.0 |  |
Change in net income attributed to shareholders (post-tax) |  | (15.0) |  | (40.0) |  |
Insurance contract liabilities net of reinsurance actual premium Pretax increase |  |  |  |  | $ 2.5 | $ 1.9
Increase in net income attributed to shareholders after tax due to future premium increase |  | $ 2.1 | $ 1.6 |  |  |
Percentage of annual premium increase |  | 30.00% | 30.00% |  |  |
Post tax gain towards other refinements to long term care valuation |  | $ 200.0 | $ 200.0 |  |  |
Post tax charge towards other refinements to long term care valuation |  | 2,300.0 | $ 1,700.0 |  |  |
Expense Updates [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  | (653.0) |  |
Change in net income attributed to shareholders (post-tax) |  |  |  | 503.0 |  |
Gain To net income attributed to shareholders after tax due to scale benefits |  | 263.0 |  |  |  |
Gain To net income attributed to shareholders after tax due to reallocation of expenses and efficiency initiatives |  | $ 256.0 |  |  |  |
Bottom of range [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Percentage provision for adverse deviation assumptions not specifically provided |  | 0.00% |  |  |  |
Top of range [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Percentage provision for adverse deviation assumptions not specifically provided |  | 20.00% |  |  |  |
MLI and John Hancock Life Insurance Company [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Assets and insurance contract liabilities related to closed blocks participating policies |  | $ 26,289.0 |  | $ 29,000.0 |  |

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