Commitments, contingencies and legal proceedings - Schedule of guarantees and financing commitments (Details) - EUR (€) € in Millions	Dec. 31, 2025	Dec. 31, 2024
Guarantees on behalf of Group companies \| Commercial guarantees
Guarantees and other contingent commitments
Guarantees issued by financial institutions	€ 943	€ 964
Corporate guarantees	275	263
Guarantees on behalf of Group companies \| Non-commercial guarantees
Guarantees and other contingent commitments
Guarantees issued by financial institutions	431	498
Corporate guarantees	37	33
Financing commitments \| Customer finance commitments
Guarantees and other contingent commitments
Customer finance commitments	7	11
Financing commitments \| Investment commitments
Guarantees and other contingent commitments
Investment commitments	€ 221	€ 306

The amount of future capital expenditures that the entity is committed to make.

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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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The amount of outstanding commitments made on behalf of the entity in related party transactions. [Refer: Total for all related parties [member]]

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Amount of corporate guarantees.

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The amount of guarantees to third parties including, but not limited to performance bonds, tender bonds and warranty bonds.

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