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IFRS 7 Disclosures - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Total unencumbered assets | $ 477,700 | $ 502,400 |  |  |  |
Dynamically hedged variable annuity guarantee best estimate liabilities, rebalancing percentage intervals | 5.00% |  |  |  |  |
Variable annuity guarantee liabilities, rebalanced basis point intervals | 20.00% |  |  |  |  |
50 basis point decrease in interest [member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Sensitivity of net income attributed to shareholders | 50.00% |  |  |  |  |
Sensitivity of our net income attributed to shareholders due to change in interest rate | $ 100 |  |  |  |  |
50 basis point increase in interest [member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Sensitivity of net income attributed to shareholders | 50.00% |  |  |  |  |
Sensitivity of our net income attributed to shareholders due to change in interest rate | $ 100 |  |  |  |  |
Unsecured revolving credit facility [Member] | Canadian chartered banks [Member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Estimated maximum borrowing capacity |  |  |  |  | $ 500 |
Unsecured revolving credit facility [Member] | U.S.banks [Member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Estimated maximum borrowing capacity |  |  |  |  |  | $ 500
Amounts outstanding |  |  | $ 0 | $ 0 |  |
FHLBI facility [Member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Estimated maximum borrowing capacity |  |  | 3,800 | 4,400 |  |
Amounts outstanding |  |  | $ 500 | $ 500 |  |
10% [member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 10.00% | 10.00% |  |  |  |
20% [member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 20.00% | 20.00% |  |  |  |
30% [member] |  |  |  |  |  |
Financial Instruments - Disclosures under IFRS 7 [line items] |  |  |  |  |  |
Percentage of expected changes in market values of publicly traded equities | 30.00% | 30.00% |  |  |  |

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