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Post-retirement benefits - Summary of fair value of plan assets (Detail) | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of information about defined benefit plans [abstract] |  |
Equities | 17.60% | 16.60%
– Quoted | 11.10% | 11.10%
– Private | 6.50% | 5.50%
Bonds | 47.70% | 47.40%
– Government fixed income | 21.00% | 21.60%
– Government inflation-linked | 1.60% | 1.60%
– Corporate and other publicly quoted | 17.50% | 16.50%
– Private | 7.60% | 7.70%
Property | 6.90% | 8.70%
– Quoted property funds | 2.20% | 2.50%
– Unquoted property funds | 4.70% | 6.20%
Qualifying insurance policies | 24.30% | 24.90%
Cash and other | 3.50% | 2.40%
Total | 100.00% | 100.00%

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- Definition The percentage cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Cash and cash equivalents, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Debt instruments, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Equity instruments, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage qualifying insurance policies contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Qualifying insurance policies, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 8 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_8&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Real estate, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Corporate And Other Publicly Quoted Bonds, Amount Contributed To Fair Value Of Plan Assets, Percent + References No definition available. + Details
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- Definition Government Fixed Income Bonds, Amount Contributed To Fair Value Of Plan Assets, Percent + References No definition available. + Details
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- Definition Government Inflation Linked Bonds, Amount Contributed To Fair Value Of Plan Assets, Percent + References No definition available. + Details
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- Definition Percentage of amount contributed to fair value of plan assets + References No definition available. + Details
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- Definition Private Bonds, Amount Contributed To Fair Value Of Plan Assets, Percent + References No definition available. + Details
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- Definition Quoted Equity Securities, Amount Contributed To Fair Value Of Plan Assets, Percent + References No definition available. + Details
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- Definition Quoted Property Funds, Amount Contributed To Fair Value Of Plan Assets, Percent + References No definition available. + Details
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