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Risk Management - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Disclosure of Risk Management [line items] |  |  |  |
Loaned securities included in invested assets | $ 10,136 | $ 10,690 |  |
Reverse repurchase transactions recorded as short-term receivables | 466 | 895 |  |
Repurchase transactions recorded as payables | $ 202 | 895 |  |
Term of credit default swaps | 5 years |  |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | $ 6,718 | 7,949 |  |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | $ 154 | $ 215 |  |
Percentage ceded to reinsurers | 91.00% | 91.00% | 91.00% | 91.00%
Exposure to credit risk | $ 22,264 | $ 25,247 |  |
Net exposure after offsetting agreements and benefit of fair value of collateral held | $ 17,984 | $ 22,465 |  |
Variable annuity guarantee liabilities, rebalanced basis point intervals | 20.00% |  |  |
Percentage of equity hedges in the dynamic program offset against hedged variable annuity liability | 95.00% | 95.00% | 95.00% | 95.00%
Total unencumbered assets | $ 470,200 | $ 477,700 |  |
FHLBI facility [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Estimated maximum borrowing capacity |  |  | $ 4,300 | $ 3,800
Amounts outstanding |  |  | 500 | $ 500
10% [member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 10.00% |  |  |
20% [member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 20.00% |  |  |
30% [member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 30.00% |  |  |
50 basis point decrease in interest [member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Sensitivity of our net income attributed to shareholders due to change in interest rate | $ 100 |  |  |
Sensitivity of net income attributed to shareholders | 50.00% |  |  |
50 basis point increase in interest [member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Sensitivity of our net income attributed to shareholders due to change in interest rate | $ 100 |  |  |
Sensitivity of net income attributed to shareholders | 50.00% |  |  |
Reinsurance contracts held [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Reinsurance assets | $ 40,249 | 44,053 |  |
U.S.banks [Member] | Unsecured revolving credit facility [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Estimated maximum borrowing capacity |  |  | $ 500 |
Amounts outstanding | 0 | 0 |  |
Canadian chartered banks [Member] | Unsecured revolving credit facility [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Estimated maximum borrowing capacity | 500 |  |  |
Fixed Surplus Note [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position | 0 | 0 |  |
Bottom of range [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Global retention limit | 30 |  |  |
Top of range [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Global retention limit |  | 35 |  |
Derivatives [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 1,357 | 1,582 |  |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | $ 0 | $ 0 |  |
AA Credit Grades or Higher [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Derivative exposure with counterparties, percentage | 33.00% | 36.00% |  |
Securities lending [Member] |  |  |  |
Disclosure of Risk Management [line items] |  |  |  |
Loaned securities included in invested assets | $ 626 | $ 723 |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 0 |  |  |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | $ 0 |  |  |

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