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Derivative and Hedging Instruments - Summary of Average Rate of the Hedging Instruments in Hedge Relationships (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 9,808 | 1,376
Less than 1 year [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 598 | 9
1 to 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 734 | 717
Over 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 8,476 | 650
At fair value [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Positive | $ 63 | $ 48
Negative | (229) | (203)
Net | $ (166) | $ (155)
Credit risk [member] | Interest rate swap contract [member] | Inflation Linked Insurance Liabilities [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Average rate | 290.13% |
Nominal amount of hedging instrument | 8,372 |
Credit risk [member] | Interest rate swap contract [member] | Inflation Linked Insurance Liabilities [Member] | Less than 1 year [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 87 |
Credit risk [member] | Interest rate swap contract [member] | Inflation Linked Insurance Liabilities [Member] | 1 to 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 459 |
Credit risk [member] | Interest rate swap contract [member] | Inflation Linked Insurance Liabilities [Member] | Over 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 7,826 |
Credit risk [member] | Interest rate swap contract [member] | Inflation Linked Insurance Liabilities [Member] | At fair value [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Positive | $ 20 |
Negative | (48) |
Net | $ (28) |
Currency risk [member] | Foreign Currency Swaps [Member] | Fixed rate liabilities [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Average rate | 0.93503% | 0.93503%
Nominal amount of hedging instrument | 500 | 505
Currency risk [member] | Foreign Currency Swaps [Member] | Fixed rate liabilities [member] | Less than 1 year [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 500 |
Currency risk [member] | Foreign Currency Swaps [Member] | Fixed rate liabilities [member] | 1 to 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument |  | 505
Currency risk [member] | Foreign Currency Swaps [Member] | Fixed rate liabilities [member] | At fair value [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Positive | $ 35 | $ 40
Net | $ 35 | $ 40
Market risk [member] | Foreign Currency Swaps [Member] | Floating Rate Foreign Currency Liabilities [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Average rate | 0.86655% | 0.86655%
Nominal amount of hedging instrument | 650 | 650
Market risk [member] | Foreign Currency Swaps [Member] | Floating Rate Foreign Currency Liabilities [Member] | Over 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 650 | 650
Market risk [member] | Foreign Currency Swaps [Member] | Floating Rate Foreign Currency Liabilities [Member] | At fair value [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Negative | $ (181) | $ (203)
Net | $ (181) | $ (203)
Market risk [member] | Foreign Currency Swaps [Member] | Debt Securities At Fair Value Through Oci [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Average rate | 1.22914% | 1.22914%
Nominal amount of hedging instrument | 46 | 48
Market risk [member] | Foreign Currency Swaps [Member] | Debt Securities At Fair Value Through Oci [Member] | 1 to 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 46 | 48
Market risk [member] | Foreign Currency Swaps [Member] | Debt Securities At Fair Value Through Oci [Member] | At fair value [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Positive | $ 5 | $ 5
Net | $ 5 | $ 5
Equity price risk [member] | Equity Contracts [member] | Stock based compensation [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Average rate | 26.28% | 25.39%
Nominal amount of hedging instrument | 240 | 173
Equity price risk [member] | Equity Contracts [member] | Stock based compensation [member] | Less than 1 year [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 11 | 9
Equity price risk [member] | Equity Contracts [member] | Stock based compensation [member] | 1 to 5 years [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Nominal amount of hedging instrument | 229 | 164
Equity price risk [member] | Equity Contracts [member] | Stock based compensation [member] | At fair value [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Positive | $ 3 | $ 3
Net | $ 3 | $ 3

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