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Derivative and Hedging Instruments - Summary of Effects of Net Investment Hedging Relationships (Detail) - Hedges of net investment in foreign operations [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 value of hedging instruments for ineffectiveness measurement | $ (196) | $ 444
Change in value of the hedged item for ineffectiveness measurement | 196 | (444)
Gains (losses) deferred in AOCI | 196 | (444)
Forward contracts [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in value of hedging instruments for ineffectiveness measurement | (1) | (14)
Change in value of the hedged item for ineffectiveness measurement | 1 | 14
Gains (losses) deferred in AOCI | 1 | 14
Non-functional currency denominated debt [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Change in value of hedging instruments for ineffectiveness measurement | (195) | 458
Change in value of the hedged item for ineffectiveness measurement | 195 | (458)
Gains (losses) deferred in AOCI | $ 195 | $ (458)

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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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- Definition The gain (loss) on the change in fair value of the hedging instrument 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 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2023-03-23 + Details
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