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Insurance and Reinsurance Contract Assets and Liabilities - Additional Information (Detail) - CAD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 02, 2024 | Feb. 22, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Jan. 02, 2025 | Nov. 20, 2024 | Mar. 25, 2024 | Dec. 11, 2023
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  | $ (347) |  | $ (174) | $ (3,197) |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions |  |  | $ 47 |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions |  |  | $ 37 |  |  |  |  |  |  |  |
Bottom of range | With effect from the fourth quarter |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Confidence level used to determine risk adjustment for non-financial risk |  |  | 95.00% |  |  |  | 95.00% |  |  |  |
Insurance risk |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax net income attributed to shareholders |  |  |  | 27 |  | (250) | $ 171 |  |  |  |
Increase (decrease) in net income attributed to shareholders after tax |  |  |  | (14) |  | (199) | 105 |  |  |  |
Increase (decrease) in pre-tax net income attributed to participating policyholders |  |  |  | 58 |  | 29 | 173 |  |  |  |
Increase (decrease) in post-tax net income attributed to participating policyholders |  |  |  | 74 |  | 21 | 165 |  |  |  |
Increase (decrease) in contractual service margin |  |  | $ 2,638 | 116 |  | (421) | 2,754 |  |  |  |
Increase in pre-tax other comprehensive income |  |  |  | 146 |  | 771 | 99 |  |  |  |
Increase in post-tax other comprehensive income |  |  |  | 110 |  | 632 | $ 73 |  |  |  |
Increase in pre-tax other comprehensive income attributed to participating policyholders |  |  |  |  |  | 45 |  |  |  |  |
Increase in post-tax other comprehensive income attributed to participating policyholders |  |  |  |  |  | 32 |  |  |  |  |
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions |  |  | 2,850 |  |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions |  |  | 144 |  |  |  |  |  |  |  |
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 policyholders due to changes in acturial assumptions |  |  | 115 |  |  |  |  |  |  |  |
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions |  |  | $ 91 |  |  |  |  |  |  |  |
Insurance risk | Canada |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in impact of changes in pre fulfilment cash flows |  |  |  | (159) |  | (266) |  |  |  |  |
Increase (decrease) in impact of changes in net income attributed to shareholder pre-tax |  |  |  | 52 |  | 3 |  |  |  |  |
Increase (decrease) in impact of changes in net income attributed to shareholders after tax |  |  |  | 37 |  | 2 |  |  |  |  |
Increase (decrease) in impact of changes in contractual service margin flows |  |  |  | 142 |  | 222 |  |  |  |  |
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder pre-tax |  |  |  | 2 |  | (15) |  |  |  |  |
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder post-tax |  |  |  | 1 |  | (10) |  |  |  |  |
Insurance risk | U.S. |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in impact of changes in pre fulfilment cash flows |  |  |  |  | $ 270 | 895 |  |  |  |  |
Increase (decrease) in impact of changes in net income attributed to shareholder pre-tax |  |  |  |  | 134 | (256) |  |  |  |  |
Increase (decrease) in impact of changes in net income attributed to shareholders after tax |  |  |  |  | 106 | (202) |  |  |  |  |
Increase (decrease) in impact of changes in contractual service margin flows |  |  |  |  | (600) | (1,228) |  |  |  |  |
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder pre-tax |  |  |  |  | 196 | 589 |  |  |  |  |
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder post-tax |  |  |  |  | $ 155 | 466 |  |  |  |  |
Insurance risk | Asia |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contractual service margin |  |  |  |  |  | 591 |  |  |  |  |
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions |  |  |  |  |  | 818 |  |  |  |  |
Decrease in pre-tax income attributable to shareholders due to updates in incidence rates |  |  |  |  |  | 4 |  |  |  |  |
Decrease in after-tax income attributable to shareholders due to updates in incidence rates |  |  |  |  |  | 5 |  |  |  |  |
Increase (decrease) in pre-tax other comprehensive income attributable to shareholders due to updates in incidence rates |  |  |  |  |  | 213 |  |  |  |  |
Increase (decrease) in after tax other comprehensive income attributable to shareholders due to updates in incidence rates |  |  |  |  |  | 190 |  |  |  |  |
Insurance risk | Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions |  |  |  | 1 |  |  |  |  |  |  |
Increase in pre-tax fulfilment cash flows due to changes in actuarial methods and assumptions |  |  |  |  |  | 15 |  |  |  |  |
Increase in pre-tax net income attributable to shareholders due to changes in actuarial methods and assumptions |  |  |  |  |  | 7 |  |  |  |  |
Increase in post-tax net income attributable to shareholders due to changes in actuarial methods and assumptions |  |  |  |  |  | 6 |  |  |  |  |
Decrease in contractual service margin flows due to changes in actuarial methods and assumptions |  |  |  |  |  | 6 |  |  |  |  |
Increase (decrease) in pre tax other comprehensive income due to changes in acturial methods and assumptions |  |  |  | 1 |  | (16) |  |  |  |  |
Increase (decrease) in post tax other comprehensive income due to changes in acturial methods and assumptions |  |  |  | 1 |  | $ (14) |  |  |  |  |
Insurance risk | Bottom of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Confidence level used to determine risk adjustment for non-financial risk |  |  | 90.00% |  |  | 90.00% | 90.00% |  |  |  |
Insurance risk | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Confidence level used to determine risk adjustment for non-financial risk |  |  | 95.00% |  |  | 95.00% | 95.00% |  |  |  |
Lapse and policyholder behaviour updates |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  |  | $ 620 | $ 98 |  |  |  |
Reinsurance contract and other risk adjustment review |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  |  | $ 427 |  |  |  |  |
Reinsurance contract and other risk adjustment review | Bottom of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Confidence level used to determine risk adjustment for non-financial risk |  |  |  |  |  | 90.00% |  |  |  |  |
Reinsurance contract and other risk adjustment review | Top of range |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Confidence level used to determine risk adjustment for non-financial risk |  |  |  |  |  | 95.00% |  |  |  |  |
Expense updates |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  |  | $ (406) |  |  |  |  |
Financial related updates |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  |  | (386) |  |  |  |  |
Mortality and morbidity updates |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  |  | (273) | 265 |  |  |  |
Methodology and other updates |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  | $ (2,850) | (577) |  | $ (156) | (3,427) |  |  |  |
Canada variable annuity product review |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in pre-tax fulfilment cash flows |  |  |  |  |  |  | $ (133) |  |  |  |
Asia | Insurance risk |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contractual service margin |  |  | 2,348 |  |  |  |  |  |  |  |
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions |  |  | 2,513 |  |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions |  |  | 107 |  |  |  |  |  |  |  |
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 policyholders due to changes in acturial assumptions |  |  | 75 |  |  |  |  |  |  |  |
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions |  |  | 62 |  |  |  |  |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions |  |  | 17 |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions |  |  | 14 |  |  |  |  |  |  |  |
Canada | Insurance risk |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contractual service margin |  |  | 213 |  |  |  |  |  |  |  |
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions |  |  | 246 |  |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions |  |  | 4 |  |  |  |  |  |  |  |
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 policyholders due to changes in acturial assumptions |  |  | 40 |  |  |  |  |  |  |  |
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions |  |  | 29 |  |  |  |  |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions |  |  | 11 |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions |  |  | 8 |  |  |  |  |  |  |  |
U.S. | Insurance risk |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contractual service margin |  |  | 78 |  |  |  |  |  |  |  |
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions |  |  | 91 |  |  |  |  |  |  |  |
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions |  |  | 33 |  |  |  |  |  |  |  |
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions |  |  | 26 |  |  |  |  |  |  |  |
Decrease in pre tax other comprehensive income due to changes in acturial assumptions |  |  | 20 |  |  |  |  |  |  |  |
Decrease in post tax other comprehensive income due to changes in acturial assumptions |  |  | $ 15 |  |  |  |  |  |  |  |
Market Movements And Updates In Morbidity Assumption In Other Geographies | Asia | Insurance risk | Asia |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contractual service margin |  |  |  | 574 |  |  |  |  |  |  |
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions |  |  |  | 457 |  |  |  |  |  |  |
Decrease in pre-tax income attributable to shareholders due to updates in incidence rates |  |  |  | 159 |  |  |  |  |  |  |
Decrease in after-tax income attributable to shareholders due to updates in incidence rates |  |  |  | 157 |  |  |  |  |  |  |
Increase (decrease) in pre-tax other comprehensive income attributable to shareholders due to updates in incidence rates |  |  |  | (53) |  |  |  |  |  |  |
Increase (decrease) in after tax other comprehensive income attributable to shareholders due to updates in incidence rates |  |  |  | $ (47) |  |  |  |  |  |  |
Global Atlantic Financial Group | Reinsurance contracts held |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Invested assets transferred |  | $ 13,400 |  |  |  |  |  |  |  |  |
Insurance and investment contract net liabilities |  | 13,200 |  |  |  |  |  |  |  |  |
Reinsurance contractual service margin |  | 308 |  |  |  |  |  |  |  |  |
Financial assets |  | $ 134 |  |  |  |  |  |  |  |  |
RGA Life Reinsurance Company of Canada | Reinsurance contracts held |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Invested assets transferred | $ 5,500 |  |  |  |  |  |  |  |  |  |
Insurance and investment contract net liabilities | 5,400 |  |  |  |  |  |  |  |  |  |
Reinsurance contractual service margin | $ 213 |  |  |  |  |  |  |  |  |  |
Reinsurance Group of America, Incorporated | Reinsurance contracts held |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Invested assets transferred |  |  |  |  |  |  |  | $ 5,400 |  |  |
Reinsurance Group of America, Incorporated | Reinsurance contracts held | Forecast |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Insurance and investment contract net liabilities |  |  |  |  |  |  |  | $ 5,400 |  |  |
Transaction Has Closed | Administering The Insurance Contracts | RGA Life Reinsurance Company of Canada | Reinsurance contracts held |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share in the insurance contracts |  |  |  |  |  |  |  |  |  | 100.00% |
Transaction Has Closed | LTC Block | Administering The Insurance Contracts | Global Atlantic Financial Group | Reinsurance contracts held |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share in the insurance contracts |  |  |  |  |  |  |  |  |  |  | 80.00%
Transaction Has Closed | Other Block | Administering The Insurance Contracts | Global Atlantic Financial Group | Reinsurance contracts held |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share in the insurance contracts |  |  |  |  |  |  |  |  |  |  | 100.00%
Transaction Expected To Close | LTC And Structured Settlements Blocks | Administering The Insurance Contracts | Reinsurance Group of America, Incorporated | Reinsurance contracts held |  |  |  |  |  |  |  |  |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage share in the insurance contracts |  |  |  |  |  |  |  |  | 75.00% |  |

X
- Definition The confidence level used to determine the risk adjustment for non-financial risk. [Refer: Risk adjustment for non-financial risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 119 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_119&doctype=Standard -URIDate 2024-03-27 + Details
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