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Derivative and Hedging Instruments - Summary of Effects of Derivatives in Cash Flow Hedging Relationships (Detail) - Cash flow hedges [Member] - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about hedges [Line Items] |  |
Change in fair value of hedged items for ineffectiveness measurement | $ (50) | $ (210)
Change in fair value of hedging instruments for ineffectiveness measurement | 50 | 210
Gains (losses) deferred in AOCI on derivatives | 50 | 210
Gains (losses) reclassified from AOCI into Total investment result | 92 | (9)
Fixed rate liabilities [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in fair value of hedged items for ineffectiveness measurement |  | (34)
Change in fair value of hedging instruments for ineffectiveness measurement |  | 34
Gains (losses) deferred in AOCI on derivatives |  | 34
Gains (losses) reclassified from AOCI into Total investment result |  | 35
Interest rate swaps [Member] | Commodity price risk [member] | Inflation Linked Insurance Liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in fair value of hedged items for ineffectiveness measurement | 4 |
Change in fair value of hedging instruments for ineffectiveness measurement | (4) |
Gains (losses) deferred in AOCI on derivatives | (4) |
Gains (losses) reclassified from AOCI into Total investment result | 81 |
Foreign currency swaps [Member] | Interest And Foreign Exchange Risk [Member] | Fixed rate liabilities [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in fair value of hedged items for ineffectiveness measurement | (23) | (175)
Change in fair value of hedging instruments for ineffectiveness measurement | 23 | 175
Gains (losses) deferred in AOCI on derivatives | 23 | 175
Gains (losses) reclassified from AOCI into Total investment result | 16 | (49)
Foreign currency swaps [Member] | Currency risk [member] | Fixed rate assets [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in fair value of hedged items for ineffectiveness measurement | 10 | 1
Change in fair value of hedging instruments for ineffectiveness measurement | (10) | (1)
Gains (losses) deferred in AOCI on derivatives | (10) | (1)
Gains (losses) reclassified from AOCI into Total investment result | (8) | (1)
Equity contracts [Member] | Equity price risk [member] | Stock based compensation [member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in fair value of hedged items for ineffectiveness measurement | (40) | (2)
Change in fair value of hedging instruments for ineffectiveness measurement | 40 | 2
Gains (losses) deferred in AOCI on derivatives | 40 | 2
Gains (losses) reclassified from AOCI into Total investment result | 3 | $ 6
Treasury Locks [Member] | Interest rate risk [member] | Forecasted liability issuance [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in fair value of hedged items for ineffectiveness measurement | (1) |
Change in fair value of hedging instruments for ineffectiveness measurement | 1 |
Gains (losses) deferred in AOCI on derivatives | $ 1 |

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2023-03-23 + Details
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