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Post-retirement benefits - Summary of maturity of defined benefit obligations (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of defined benefit plans [Line Items] |  |  |
Proportion relating to current employees | 18.00% | 17.00% | 18.00%
Proportion relating to former employees not yet retired | 9.00% | 9.00% | 9.00%
Proportion relating to retirees | 73.00% | 74.00% | 73.00%
Total | 100.00% | 100.00% | 100.00%
Average duration of obligations (years) | 11 years 6 months | 10 years 9 months 18 days | 11 years 4 months 24 days
Pension benefits |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Proportion relating to current employees | 19.00% |  |
Proportion relating to former employees not yet retired | 9.00% |  |
Proportion relating to retirees | 72.00% |  |
Total | 100.00% |  |
Average duration of obligations (years) | 11 years 6 months |  |
Other benefits |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Proportion relating to current employees | 15.00% |  |
Proportion relating to former employees not yet retired | 0.00% |  |
Proportion relating to retirees | 85.00% |  |
Total | 100.00% |  |
Average duration of obligations (years) | 11 years 6 months |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_147_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Defined benefit obligation maturity percentage. + References No definition available. + Details
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- Definition Defined benefit obligations relating to current employees maturity percentage. + References No definition available. + Details
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- Definition Defined benefit obligations relating to former employees not yet retired maturity percentage. + References No definition available. + Details
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- Definition Defined benefit obligations relating to retirees maturity percentage. + References No definition available. + Details
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- Details
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- Details
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