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Insurance Contract Liabilities and Reinsurance Assets - Summary of Potential Impact on Net Income Attributed to Shareholders Arising From Changes to Non-economic Assumptions For Long-Term Care (Detail) - Long term care [member] - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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2% Adverse change in future mortality rates [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Decrease in net income attributed to shareholders | $ (300) | $ (300)
5% adverse change in future morbidity incidence rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Decrease in net income attributed to shareholders | (2,100) | (1,900)
5% adverse change in future morbidity claims termination rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Decrease in net income attributed to shareholders | (3,100) | (2,800)
10% adverse change in future policy termination rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Decrease in net income attributed to shareholders | (400) | (400)
5% increase in future expense levels [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Decrease in net income attributed to shareholders | $ (100) | $ (100)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Decrease in profit loss attributable to shareholders due to policy related assumptions. + References No definition available. + Details
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