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Insurance Contract Liabilities and Reinsurance Assets - Summary of Actuarial Methods and Assumptions (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | $ (80) | $ 287
Attributed to participating policyholders' account | (77) | 222
Attributed to shareholders' account | (3) | 65
Change in net income attributed to shareholders | 36 | (41)
Long-term care triennial review [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | 19 | 51
Attributed to shareholders' account | 19 | 51
Change in net income attributed to shareholders | (15) | (40)
Mortality and morbidity updates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | 157 | 350
Attributed to participating policyholders' account | (5) |
Attributed to shareholders' account | 162 | 350
Change in net income attributed to shareholders | (126) | (257)
Lapses and policyholder behaviour updates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | 317 | 686
Attributed to participating policyholders' account | 74 | 18
Attributed to shareholders' account | 243 | 668
Change in net income attributed to shareholders | (192) | (534)
Expense Updates [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total |  | (653)
Attributed to participating policyholders' account |  | (25)
Attributed to shareholders' account |  | (628)
Change in net income attributed to shareholders |  | 503
Investment related updates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | (210) | (257)
Attributed to participating policyholders' account | (1) | (2)
Attributed to shareholders' account | (209) | (255)
Change in net income attributed to shareholders | 157 | 168
Other updates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Total | (363) | 110
Attributed to participating policyholders' account | (145) | 231
Attributed to shareholders' account | (218) | (121)
Change in net income attributed to shareholders | $ 212 | $ 119

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