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Insurance and Reinsurance Contract Assets and Liabilities - Potential Impact Arising from Changes to Non-Economic Assumptions (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
2% adverse change in future mortality rates for portfolios where an increase in rates increases insurance contract liabilities, gross |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | $ (700) | $ (800)
Net income attributed to shareholders, increase | (700) | (400)
Other comprehensive income attributed to shareholders, increase | 200 | 0
Total comprehensive income attributed to shareholders, increase | (500) | (400)
2% adverse change in future mortality rates for portfolios where an increase in rates increases insurance contract liabilities, net |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | (200) | (200)
Net income attributed to shareholders, increase | (300) | (200)
Other comprehensive income attributed to shareholders, increase | 100 | 0
Total comprehensive income attributed to shareholders, increase | (200) | (200)
2% adverse change in future mortality rates for portfolios where a decrease in rates increases insurance contract liabilities, gross |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, decrease | (100) | 0
Net income attributed to shareholders, decrease | 0 | 0
Other comprehensive income attributed to shareholders, decrease | 100 | 0
Total comprehensive income attributed to shareholders, decrease | 100 | 0
2% adverse change in future mortality rates for portfolios where a decrease in rates increases insurance contract liabilities, net |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, decrease | (600) | (500)
Net income attributed to shareholders, decrease | 0 | 0
Other comprehensive income attributed to shareholders, decrease | 200 | 100
Total comprehensive income attributed to shareholders, decrease | 200 | 100
5% adverse change in future morbidity rates (incidence and termination), gross |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | (2,200) | (1,500)
Net income attributed to shareholders, increase | (3,000) | (3,300)
Other comprehensive income attributed to shareholders, increase | 700 | 500
Total comprehensive income attributed to shareholders, increase | (2,300) | (2,800)
5% adverse change in future morbidity rates (incidence and termination), net |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | (1,800) | (1,300)
Net income attributed to shareholders, increase | (2,700) | (3,300)
Other comprehensive income attributed to shareholders, increase | 600 | 400
Total comprehensive income attributed to shareholders, increase | (2,100) | (2,900)
10% change in future policy termination rates for portfolios where an increase in rates increases insurance contract liabilities, gross |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | (700) | (600)
Net income attributed to shareholders, increase | (100) | (100)
Other comprehensive income attributed to shareholders, increase | (200) | (100)
Total comprehensive income attributed to shareholders, increase | (300) | (200)
10% change in future policy termination rates for portfolios where an increase in rates increases insurance contract liabilities, net |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | (600) | (500)
Net income attributed to shareholders, increase | (100) | (100)
Other comprehensive income attributed to shareholders, increase | (200) | (100)
Total comprehensive income attributed to shareholders, increase | (300) | (200)
10% change in future policy termination rates for portfolios where a decrease in rates increases insurance contract liabilities, gross |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, decrease | (900) | (1,200)
Net income attributed to shareholders, decrease | (700) | (400)
Other comprehensive income attributed to shareholders, decrease | 400 | 300
Total comprehensive income attributed to shareholders, decrease | (300) | (100)
10% change in future policy termination rates for portfolios where a decrease in rates increases insurance contract liabilities, net |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, decrease | (700) | (800)
Net income attributed to shareholders, decrease | (400) | (300)
Other comprehensive income attributed to shareholders, decrease | 300 | 200
Total comprehensive income attributed to shareholders, decrease | (100) | (100)
5% increase in future expense levels, gross |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | (600) | (600)
Net income attributed to shareholders, increase | (100) | 0
Other comprehensive income attributed to shareholders, increase | 100 | 0
Total comprehensive income attributed to shareholders, increase | 0 | 0
5% increase in future expense levels, net |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
CSM net of NCI, increase | (600) | (600)
Net income attributed to shareholders, increase | (100) | 0
Other comprehensive income attributed to shareholders, increase | 100 | 0
Total comprehensive income attributed to shareholders, increase | $ 0 | $ 0
5% deterioration in incidence rates |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
Risk variable percentage | 5.00% |
5% deterioration in claim termination rates |  |
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items] |  |
Risk variable percentage | 5.00% |

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