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Post-retirement benefits - Summary of maturity of defined benefit obligations (Detail)	12 Months Ended
	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

X

- 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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X

- 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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