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Insurance Contract Liabilities and Reinsurance Assets - Additional Information (Detail) - CAD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 07, 2019 | Oct. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Fair value of assets backing net insurance contract liabilities excluding reinsurance assets |  |  |  | $ 278,521 | $ 287,326 | $ 278,521
Fair value of assets backing capital and other liabilities |  |  |  | 456,278 | 465,497 | 456,278
Change in insurance and investment contract liabilities |  |  |  |  | (174) | 277
Change in net income attributed to shareholders (post-tax) |  |  |  |  | (51) | (35)
Change in net income attributed to shareholders |  |  |  | 2,800 | (62) |
Coinsurance, after tax loss |  |  | $ 74 |  |  |
Ceded premiums |  |  | 3,700 |  |  |
Increase of reinsurance assets |  |  | $ 3,600 |  | (9,733) | 2,269
Quota share coinsurance agreements, percentage |  |  | 100.00% |  |  |
Jackson National Life Insurance Company [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Ceded premiums |  | $ 7,000 |  |  |  |
Increase of reinsurance assets |  | $ 7,500 |  |  |  |
Quota share coinsurance agreements, percentage |  | 100.00% |  |  |  |
Coinsurance, after tax gain |  | $ 142,000 |  |  |  |
Mortality and morbidity updates [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | 319 | (254)
Change in net income attributed to shareholders (post-tax) |  |  |  |  | (360) | 299
Change in net income attributed to shareholders |  |  |  |  | (511) |
Mortality and morbidity updates [member] | U.S. [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | (384)
Mortality and morbidity updates [member] | Canada [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 264
Mortality and morbidity updates [member] | Canada [member] | Retail Insurance Business [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 222
Mortality and morbidity updates [member] | Asia [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 264
Mortality and morbidity updates [member] | Japan [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 197
Lapses and policyholder behavior [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | 287 | 1,019
Change in net income attributed to shareholders (post-tax) |  |  |  |  | (226) | (783)
Change in net income attributed to shareholders |  |  |  |  | (287) |
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) |  |  |  |  | (252) |
Lapses and policyholder behavior [member] | Canada [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | (315)
Lapses and policyholder behavior [member] | Canada [member] | Segregated funds [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | (242)
Lapses and policyholder behavior [member] | Japan [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | (226)
Investment return assumptions [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | (96) |
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 143 |
Change in net income attributed to shareholders |  |  |  |  | 146 |
Investment return assumptions [member] | Bond default rates [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 401 |
Investment return assumptions [member] | ALDA and Public Equity Investment Return Assumptions [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  | (210) |
Investment return assumptions [member] | Other refinements [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  | (48) |
Other updates [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  | (684) |
Change in net income attributed to shareholders (post-tax) |  |  |  |  | 392 | 449
Change in net income attributed to shareholders |  |  |  |  | $ 590 |
Other updates [member] | ALDA and Public Equity Investment Return Assumptions [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  |  | 1,296
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | (892)
Other updates [member] | Other refinements [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  |  | (220)
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 301
Other updates [member] | Corporate Spread Assumptions [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  |  | (515)
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 344
Other updates [member] | Refinements To Liability and Tax Cash Flows [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in insurance and investment contract liabilities |  |  |  |  |  | (1,049)
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 696
Other updates [member] | U.S. [member] | Refinements To Liability and Tax Cash Flows [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Change in net income attributed to shareholders (post-tax) |  |  |  |  |  | 696
Scenario Forecast [member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Reinsurance transaction, after-tax gain | $ 80 |  |  |  |  |
Bottom of range [Member] |  |  |  |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |  |  |  |
Percentage provision for adverse deviation assumptions not specifically provided |  |  |  |  | 5.00% |
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 |  |  |  | $ 28,135 | $ 28,790 | $ 28,135

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