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Insurance Contract Liabilities and Reinsurance Assets - Summary of Actuarial Methods and Assumptions (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | $ 563 | $ 74
Attributed to participating policyholders' account | 301 | (18)
Attributed to shareholders'account | 262 | 92
Change in net income attributed to shareholders | (198) | (21)
Mortality and morbidity updates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | (304) | 25
Attributed to participating policyholders' account | (1) | 47
Attributed to shareholders'account | (303) | (22)
Change in net income attributed to shareholders | 232 | 14
Lapses and policyholder behavior [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | 893 | 135
Attributed to participating policyholders' account | 0 | 17
Attributed to shareholders'account | 893 | 118
Change in net income attributed to shareholders | (682) | (75)
Investment return assumptions [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | (212) | 12
Attributed to participating policyholders' account | (153) | 81
Attributed to shareholders'account | (59) | (69)
Change in net income attributed to shareholders | 31 | 70
Other updates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | 228 | (109)
Attributed to participating policyholders' account | 455 | (163)
Attributed to shareholders'account | (227) | 54
Change in net income attributed to shareholders | 190 | (22)
Long term care triennial review [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | (42) | 11
Attributed to participating policyholders' account | 0 |
Attributed to shareholders'account | (42) | 11
Change in net income attributed to shareholders | $ 31 | $ (8)

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