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Employee benefits - Summary of Main Financial Assumptions Used in Determining the Present Value of the TFR and Other Leaving Indemnities (Detail) | Dec. 31, 2025 | Dec. 31, 2024
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Spain |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Inflation rate | 2.00% | 2.00%
Bottom of range | Italy |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 2.90% | 2.70%
Inflation rate | 1.70% | 1.80%
Turn-over rate | 1.00% | 1.00%
Bottom of range | Spain |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 3.20% | 3.00%
Turn-over rate | 4.50% | 4.00%
Bottom of range | China |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 1.80% | 2.00%
Inflation rate | 1.50% | 1.50%
Turn-over rate | 2.00% | 2.00%
Top of range | Italy |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 3.60% | 3.20%
Inflation rate | 2.00% | 2.00%
Turn-over rate | 10.00% | 10.00%
Top of range | Spain |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 3.40% | 3.20%
Turn-over rate | 5.00% | 5.00%
Top of range | China |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 1.90% | 2.10%
Inflation rate | 6.50% | 9.00%
Turn-over rate | 7.00% | 4.50%

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- Definition The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard -URIDate 2025-03-27 + Details
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