Payroll, staff and employee benefits obligations - Actuarial assumptions (Details)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension benefits
Assumptions used to determine benefits obligations
Discount rate (as a percent)	4.40%	4.30%	3.89%
Inflation rate (as a percent)	2.53%	2.54%	2.49%
Pension benefits \| Euro zone
Assumptions used to determine benefits obligations
Discount rate (as a percent)	3.72%	3.49%	3.27%
Inflation rate (as a percent)	2.00%	1.98%	2.24%
Pension benefits \| United States
Assumptions used to determine benefits obligations
Discount rate (as a percent)	4.75%	5.00%	4.50%
Inflation rate (as a percent)	2.50%	2.50%	2.50%
Pension benefits \| United Kingdom
Assumptions used to determine benefits obligations
Discount rate (as a percent)	5.50%	5.50%	4.50%
Inflation rate (as a percent)	3.00%	3.25%	3.00%
Other benefits
Assumptions used to determine benefits obligations
Discount rate (as a percent)	4.47%	4.17%	4.26%
Other benefits \| Euro zone
Assumptions used to determine benefits obligations
Discount rate (as a percent)	3.67%	3.41%	3.30%
Other benefits \| United States
Assumptions used to determine benefits obligations
Discount rate (as a percent)	5.00%	5.00%	4.50%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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]]

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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.

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