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Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Currency translation differences: |  |
Gain (loss) on marketable equity and debt securities (net of taxes of $(14) and $1) | $ (3) | $ (2)
Share of other comprehensive income of associates and joint ventures | 1 | 0
Remeasurements of retirement benefit plans (net of taxes of $13 and $(91)) | (45) | 171
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries, tax | 9 | (2)
Change in fair value of available-for-sale financial instruments, taxes | 0 | 0
Remeasurements of retirement benefit plans, tax | 13 | (91)
Accumulated other comprehensive income |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income – beginning of year | 202 | 247
Currency translation differences: |  |
Unrealized gain (loss) on translation of foreign subsidiaries | 822 | (50)
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries (net of taxes of $9 and $(2)) (Note 30(b)) | (56) | 11
Other comprehensive income net of tax exchange differences on translation | 766 | (39)
Gain (loss) on marketable equity and debt securities (net of taxes of $(14) and $1) | 93 | (6)
Share of other comprehensive income of associates and joint ventures | 1 | 0
Remeasurements of retirement benefit plans (net of taxes of $13 and $(91)) | (45) | 171
Total other comprehensive income | 815 | 126
Less remeasurements of retirement benefit plans recorded in retained earnings | 45 | (171)
Accumulated other comprehensive income – end of year | 1,062 | 202
Change in fair value of available-for-sale financial instruments, taxes | $ (14) | $ 1

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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax, before reclassification adjustments. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The gains (losses) recognised in other comprehensive income on hedges of net investments in foreign operations, net of tax, before reclassification adjustments. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24C -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24C_b_i&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24E -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 39 -IssueDate 2022-03-24 -Paragraph 102 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=39&code=ifrs-tx-2022-en-r&anchor=para_102_a&doctype=Standard -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_a&doctype=Standard -URIDate 2022-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2022-03-24 -Paragraph 6.5.13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2022-en-r&anchor=para_6.5.13_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2017-en-b&anchor=para_81_ab&doctype=Standard&forcepdf=true -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2017-en-b&anchor=para_90&doctype=Standard&forcepdf=true -URIDate 2022-03-24 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_90&doctype=Standard -URIDate 2022-03-24 + Details
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