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Insurance Contract Liabilities and Reinsurance Assets - Additional Information (Detail) - CAD ($) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 01, 2020 | Jan. 01, 2019 | Oct. 31, 2018 | Sep. 26, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Fair value of assets backing net insurance contract liabilities excluding reinsurance assets |  |  |  |  | $ 350,264 | $ 315,952
Fair value of assets backing capital and other liabilities |  |  |  |  | 543,273 | 501,147
Change in insurance and investment contract liabilities |  |  |  |  | 563 | 74
Change in net income attributed to shareholders (post-tax) |  |  |  |  | (198) | (21)
Change in net income attributed to shareholders |  |  |  |  | (262) | (92)
Increase of reinsurance assets |  |  |  |  | (2,374) | (557)
John Hancock Life Insurance Company of New York [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Ceded premiums |  | $ 131 |  |  |  |
Increase of reinsurance assets |  | 132 |  |  |  |
Quota share coinsurance agreements, percentage |  |  |  | 90.00% |  |
Coinsurance, after tax gain |  | 18 |  |  |  |
John Hancock Life Insurance Company USA [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Ceded premiums | $ 3,300 |  |  |  |  |
Increase of reinsurance assets | 3,400 |  |  |  |  |
Quota share coinsurance agreements, percentage |  |  |  | 100.00% |  |
Coinsurance, after tax gain | $ 262 |  |  |  |  |
Jackson National Life Insurance Company [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Ceded premiums |  | 581 |  |  |  |
Increase of reinsurance assets |  | 621 |  |  |  |
Coinsurance, after tax gain |  | 31 |  |  | 31 |
Ceded commission paid |  | $ 35 |  |  |  |
Reinsurance Group of America [Member] | John Hancock Life Insurance Company of New York [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Quota share coinsurance agreements, percentage |  |  | 90.00% |  |  |
Reinsurance Group of America [Member] | John Hancock Life Insurance Company USA [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Quota share coinsurance agreements, percentage |  |  | 100.00% |  |  |
Mortality and morbidity updates [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | (304) | 25
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 232 | 14
Change in net income attributed to shareholders |  |  |  |  | 303 | 22
Lapses and policyholder behavior [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | 893 | 135
Change in net income attributed to shareholders (post-tax) |  |  |  |  | (682) | (75)
Change in net income attributed to shareholders |  |  |  |  | (893) | (118)
Lapses and policyholder behavior [member] | U.S. [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 504 |
Investment return assumptions [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | (212) | 12
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 31 | 70
Change in net income attributed to shareholders |  |  |  |  | 59 | 69
Coinsurance, after tax gain |  |  |  |  | 31 |
Other updates [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | 228 | (109)
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 190 | (22)
Change in net income attributed to shareholders |  |  |  |  | 227 | (54)
Long term care triennial review [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | (42) | 11
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 31 | (8)
Change in net income attributed to shareholders |  |  |  |  | $ 42 | (11)
Gain loss to net income attributed to shareholders after tax due to policy related assumptions |  |  |  |  |  | $ 200
Margin on policy change |  |  |  |  |  | 30.00%
Gain loss to net income attributed to shareholders after tax due to morbidity improvement |  |  |  |  |  | $ 700
Gain loss to net income attributed to shareholders after tax due to adverse deviations |  |  |  |  |  | 700
Gain loss for the impact of benefit reduction |  |  |  |  |  | 2,000
Long term care triennial review [member] | U.S. [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders |  |  |  |  |  | 1,900
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 |  |  |  |  | $ 29,480 | $ 29,402

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