Pensions and other post-employment benefits - Sensitivity analysis (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Sensitivity analysis
Discount rate (as a percent)	4.80%	4.90%
Discount rate for determining present values
Sensitivity analysis
Discount rate (as a percent)	4.80%	4.90%
Change in assumption (as a percent)	1.00%
Increase in assumption	€ 990
Decrease in assumption	€ (1,154)
Pension growth rate
Sensitivity analysis
Discount rate (as a percent)	2.10%	2.10%
Change in assumption (as a percent)	1.00%
Increase in assumption	€ (206)
Decrease in assumption	€ 167
Inflation rate
Sensitivity analysis
Discount rate (as a percent)	2.30%	2.00%
Change in assumption (as a percent)	1.00%
Increase in assumption	€ (222)
Decrease in assumption	203
Life expectancy
Sensitivity analysis
Increase in assumption	(555)
Decrease in assumption	€ 524
Change in life expectancy actuarial assumption	1 year
Life expectancy \| Bottom of range
Sensitivity analysis
Life expectancy	87 years	86 years
Life expectancy \| Top of range
Sensitivity analysis
Life expectancy	88 years	88 years

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

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The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

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