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Insurance and Reinsurance Contract Assets and Liabilities - Additional Information (Detail) $ in Millions, $ in Billions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 CAD ($) | Sep. 30, 2023 CAD ($) | Sep. 30, 2023 CAD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 11, 2023 | Dec. 31, 2022 USD ($)
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions | $ 37 |  |  |  |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions | $ 47 |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  | $ (347) |  | $ (3,197) |  |  |  |
Bottom of range [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Percentage of Risk Adjustment Confidence Level | 90.00% |  |  | 90.00% |  |  |  |
Bottom of range [Member] | With effect from the fourth quarter [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Confidence level based on risk adjustment | 95.00% |  |  | 95.00% |  |  |  |
Top of range [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Percentage of Risk Adjustment Confidence Level | 95.00% |  |  | 95.00% |  |  |  |
Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions | $ 91 |  |  |  |  |  |  |
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions | 115 |  |  |  |  |  |  |
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 119 |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 144 |  |  |  |  |  |  |
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions | 2,850 |  |  |  |  |  |  |
Increase In Impact Of Changes In Other Comprehensive Income Attributed To Shareholder Post Tax |  | 1 | $ 155 |  |  |  |  |
Increase In Impact Of Changes In Other Comprehensive Income Attributed To Shareholder Pre Tax |  | 2 | 196 |  |  |  |  |
Increase Decrease In Impact Of Changes In Contractual Service Margin Flows |  | 142 | (600) |  |  |  |  |
Increase Decrease In Impact Of Changes In Net Income Attributed To Shareholders After Tax |  | 37 | 106 |  |  |  |  |
Increase Decrease In Impact Of Changes In Net Income Attributed To Shareholder Pre Tax |  | 52 | 134 |  |  |  |  |
Increase Decrease In Impact Of Changes In PreFulfilment CashFlows |  | (159) | 270 |  |  |  |  |
Increase in pre-tax net income attributed to shareholders |  | 27 |  | $ 171 | $ 23 |  |  |
Increase (decrease) in post-tax net income attributed to shareholders |  | (14) |  | 105 | 26 |  |  |
Increase (decrease) in pre-tax net income attributed to participating policyholders |  | 58 |  | 173 | (26) |  |  |
Increase (decrease) in post-tax net income attributed to participating policyholders |  | 74 |  | 165 | (18) |  |  |
Increase (decrease) in contractual service margin | $ 2,638 | 116 |  | 2,754 | (279) |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  | 192 |  |  |
Increase in pre-tax other comprehensive income |  | 146 |  | 99 | 90 |  |  |
Increase in post-tax other comprehensive income |  | 110 |  | $ 73 | 73 |  |  |
Insurance risk [member] | Bottom of range [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Confidence level based on risk adjustment | 90.00% |  |  | 90.00% |  |  |  |
Insurance risk [member] | Top of range [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Confidence level based on risk adjustment | 95.00% |  |  | 95.00% |  |  |  |
Reinsurance contracts held [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Cumulative pre-tax decrease to the contractual service margin |  |  |  |  | 905 |  |  |
Long-term care triennial review [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  | 118 |  |  |
Future premium increases in pre-tax fulfilment cash flows |  |  |  |  | 2,500 | $ 1.9 |  |
Increase in actual premium pre-tax |  |  |  |  | $ 2,500 |  |  | $ 1.9
Percentage of annual premium increase |  |  |  |  | 30.00% | 30.00% |  |
Canada variable annuity product review [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  | $ (133) |  |  |  |
Mortality and morbidity updates [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  | 265 | $ 83 |  |  |
Lapse and policyholder behaviour updates [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  | 98 | 234 |  |  |
Methodology and other updates [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows | $ (2,850) | (577) |  | $ (3,427) | $ (243) |  |  |
Canada [member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions | 8 |  |  |  |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions | 11 |  |  |  |  |  |  |
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions | 29 |  |  |  |  |  |  |
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions | 40 |  |  |  |  |  |  |
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 3 |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 4 |  |  |  |  |  |  |
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions | 246 |  |  |  |  |  |  |
Increase (decrease) in contractual service margin | 213 |  |  |  |  |  |  |
U.S. [member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions | 15 |  |  |  |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions | 20 |  |  |  |  |  |  |
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 26 |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 33 |  |  |  |  |  |  |
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions | 91 |  |  |  |  |  |  |
Increase (decrease) in contractual service margin | 78 |  |  |  |  |  |  |
Asia [Member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions | 14 |  |  |  |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions | 17 |  |  |  |  |  |  |
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions | 62 |  |  |  |  |  |  |
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions | 75 |  |  |  |  |  |  |
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 90 |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions | 107 |  |  |  |  |  |  |
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions | 2,513 |  |  |  |  |  |  |
Increase (decrease) in contractual service margin | $ 2,348 |  |  |  |  |  |  |
Updates In Lapse Assumptions And Morbidity Updates In Other Geographies [Member] | Asia [Member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Decrease in post tax income attributable to the shareholders due to changes in acturial methods and assumptions |  | 9 |  |  |  |  |  |
Decrease in pre tax income attributable to the shareholders due to changes in acturial methods and assumptions |  | 25 |  |  |  |  |  |
Increase in post tax other comprehensive income due to changes in acturial methods and assumptions |  | 58 |  |  |  |  |  |
Increase in pre tax other comprehensive income due to changes in acturial methods and assumptions |  | 76 |  |  |  |  |  |
Increase in pre tax fulfillment cash flows due to changes in acturial methods and assumptions |  | 62 |  |  |  |  |  |
Increase (decrease) in contractual service margin |  | (120) |  |  |  |  |  |
Triannual Review Of Long Term Insurance Products [Member] | U.S. [member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Decrease in post tax income attributable to the shareholders due to changes in acturial methods and assumptions |  | 12 |  |  |  |  |  |
Decrease in pre tax income attributable to the shareholders due to changes in acturial methods and assumptions |  | 16 |  |  |  |  |  |
Increase in post tax other comprehensive income due to changes in acturial methods and assumptions |  | 86 |  |  |  |  |  |
Increase in pre tax other comprehensive income due to changes in acturial methods and assumptions |  | 110 |  |  |  |  |  |
Increase in pre tax fulfillment cash flows due to changes in acturial methods and assumptions |  | 108 |  |  |  |  |  |
Increase (decrease) in contractual service margin |  | (202) |  |  |  |  |  |
Update In Lapse Assumptions For Certain Insurance Productions And Dividend Rate On Participating Products And Changes In Discount Rates [Member] | Canada [member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Increase in post tax other comprehensive income due to changes in acturial methods and assumptions |  | 71 |  |  |  |  |  |
Increase in pre tax other comprehensive income due to changes in acturial methods and assumptions |  | 96 |  |  |  |  |  |
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions |  | 47 |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions |  | 64 |  |  |  |  |  |
Increase in pre tax fulfillment cash flows due to changes in acturial methods and assumptions |  | 22 |  |  |  |  |  |
Increase (decrease) in contractual service margin |  | 43 |  |  |  |  |  |
Market Movements And Updates In Morbidity Assumption In Other Geogrpahies [Member] | Asia [Member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Decrease in after tax other comprehensive income attributable to shareholders due to updates in incidence rates |  | 47 |  |  |  |  |  |
Decrease in pre tax other comprehensive income attributable to shareholders due to updates in incidence rates |  | 53 |  |  |  |  |  |
Decrease in after tax income attributable to shareholders due to updates in incidence rates |  | 157 |  |  |  |  |  |
Decrease in pre tax income attributable to shareholders due to updates in incidence rates |  | 159 |  |  |  |  |  |
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions |  | 457 |  |  |  |  |  |
Increase (decrease) in contractual service margin |  | 574 |  |  |  |  |  |
Unallocated amounts [member] | Insurance risk [member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Reduction in post tax other comprehensive income due to changes in acturial methods and assumptions |  | 1 |  |  |  |  |  |
Reduction in pre tax other comprehensive income due to changes in acturial methods and assumptions |  | 1 |  |  |  |  |  |
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions |  | 1 |  |  |  |  |  |
Transaction Has Closed [Member] | Administering The Insurance Contracts [Member] | Global Atlantic Financial Group [Member] | Reinsurance contracts held [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Insurance and investment contract net liabilities |  | $ 13,000 | $ 13,000 |  |  |  |  |
Transaction Has Closed [Member] | Other Block [Member] | Administering The Insurance Contracts [Member] | Global Atlantic Financial Group [Member] | Reinsurance contracts held [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Percentage share in the insurance contracts |  |  |  |  |  |  | 80.00% |
Transaction Has Closed [Member] | LTC Block [Member] | Administering The Insurance Contracts [Member] | Global Atlantic Financial Group [Member] | Reinsurance contracts held [Member] |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |  |  |  |  |  |
Percentage share in the insurance contracts |  |  |  |  |  |  | 100.00% |

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