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Insurance Contract Liabilities and Reinsurance Assets - Summary of Actuarial Methods and Assumptions (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  | $ (174) | $ 277
Attributed to participating policyholders' account |  | (236) |
Attributed to participating policyholders' account |  |  | 97
Attributed to shareholders'account | $ (2,800) | 62 |
Attributed to shareholders'account |  |  | 180
Change in net income attributed to shareholders |  | (51) | (35)
Mortality and morbidity updates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  | 319 | (254)
Attributed to participating policyholders' account |  | (192) |
Attributed to participating policyholders' account |  |  | 9
Attributed to shareholders'account |  | 511 |
Attributed to shareholders'account |  |  | (263)
Change in net income attributed to shareholders |  | (360) | 299
Lapses and policyholder behavior [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  | 287 | 1,019
Attributed to shareholders'account |  | 287 |
Attributed to shareholders'account |  |  | 1,019
Change in net income attributed to shareholders |  | (226) | (783)
Investment return assumptions [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  | (96) |
Attributed to participating policyholders' account |  | 50 |
Attributed to shareholders'account |  | (146) |
Change in net income attributed to shareholders |  | 143 |
Investment return assumptions [member] | ALDA and Public Equity Investment Return Assumptions [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Change in net income attributed to shareholders |  | (210) |
Investment return assumptions [member] | Other refinements [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Change in net income attributed to shareholders |  | (48) |
Other updates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  | (684) |
Attributed to participating policyholders' account |  | (94) |
Attributed to shareholders'account |  | (590) |
Change in net income attributed to shareholders |  | $ 392 | 449
Other updates [member] | ALDA and Public Equity Investment Return Assumptions [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  |  | 1,296
Attributed to participating policyholders' account |  |  | 5
Attributed to shareholders'account |  |  | 1,291
Change in net income attributed to shareholders |  |  | (892)
Other updates [member] | Corporate Spread Assumptions [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  |  | (515)
Attributed to participating policyholders' account |  |  | (1)
Attributed to shareholders'account |  |  | (514)
Change in net income attributed to shareholders |  |  | 344
Other updates [member] | Refinements To Liability and Tax Cash Flows [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  |  | (1,049)
Attributed to shareholders'account |  |  | (1,049)
Change in net income attributed to shareholders |  |  | 696
Other updates [member] | Other refinements [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |
Total |  |  | (220)
Attributed to participating policyholders' account |  |  | 84
Attributed to shareholders'account |  |  | (304)
Change in net income attributed to shareholders |  |  | $ 301

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