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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
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%

X

- 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
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- Definition

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