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Risk Management - Additional Information (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Disclosure of credit risk exposure [line items] |  |  |  |  |
Unencumbered assets | $ 516,600 |  | $ 470,200 |  |
Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability | 95.00% |  | 95.00% | 95.00% | 95.00%
Loaned securities included in invested assets | $ 11,663 |  | $ 10,136 |  |
Reverse repurchase transactions recorded as short-term receivables | 1,594 |  | 466 |  |
Repurchase agreements and cash collateral on securities lent | $ 668 |  | 202 |  |
Term of credit default swaps | 5 years | 5 years |  |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | $ 7,202 |  | 6,718 |  |
Net amounts excluding financing entity | $ 429 |  | $ 154 |  |
Percentage ceded to reinsurers | 93.00% |  | 91.00% | 93.00% | 91.00%
Exposure to credit risk | $ 40,753 |  | $ 22,264 |  |
Net exposure after offsetting agreements and benefit of fair value of collateral held | $ 17,595 |  | 17,984 |  |
+10% |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 10.00% | 10.00% |  |  |
+20% |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 20.00% | 20.00% |  |  |
+30% |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 30.00% | 30.00% |  |  |
Reinsurance contracts held |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Reinsurance assets | $ 58,349 |  | 40,249 |  |
Bottom of range |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Global retention limit |  | $ 30 |  |  |
Top of range |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Global retention limit |  | $ 35 |  |  |
Derivatives |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 1,319 |  | 1,357 |  |
Net amounts excluding financing entity | $ 0 |  | $ 0 |  |
AA Credit Grades Or Higher |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Derivative exposure with counterparties, percentage | 30.00% | 30.00% | 33.00% |  |
Securities lending |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Loaned securities included in invested assets | $ 1,021 |  | $ 626 |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 0 |  | 0 |  |
Net amounts excluding financing entity | $ 0 |  | 0 |  |
0.5% Decrease in Interest Rates |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Sensitivity of net income attributed to shareholders | 0.50% | 0.50% |  |  |
Sensitivity of our net income attributed to shareholders due to change in interest rate | $ 100 |  |  |  |
0.5% Increase in Interest Rates |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Sensitivity of net income attributed to shareholders | 0.50% | 0.50% |  |  |
Sensitivity of our net income attributed to shareholders due to change in interest rate | $ 100 |  |  |  |
0.5% Parallel Move in Interest Rates on CSM |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Sensitivity of net income attributed to shareholders | 0.50% | 0.50% |  |  |
0.5% Parallel Move in Corporate Spread |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Sensitivity of net income attributed to shareholders | 0.50% | 0.50% |  |  |
0.2% Percentage Parallel Move in Swap Spread |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Sensitivity of net income attributed to shareholders | 0.20% | 0.20% |  |  |
Banks |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Estimated maximum borrowing capacity |  |  |  | $ 500 |
Unsecured revolving credit facility |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Amounts outstanding | $ 0 |  | $ 0 |  |
Unsecured revolving credit facility | Canadian Chartered Banks |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Estimated maximum borrowing capacity | $ 500 |  |  |  |
Federal Home Loan Bank of Indianapolis |  |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |  |
Estimated maximum borrowing capacity |  |  |  | 3,800 | $ 4,300
Amounts outstanding |  |  |  | $ 500 | $ 500

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