Equity - Composition of net debt and group equity (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity [abstract]
Long-term debt	€ 6,934	€ 7,113	€ 7,035
Short-term debt	1,151	526	654
Total debt	8,084	7,639	7,689
Cash and cash equivalents	2,794	2,401	1,869	€ 1,172
Net debt	5,290	5,238	5,820
Shareholders’ equity	10,957	12,006	12,028
Non-controlling interests	32	37	33
Group equity	€ 10,990	€ 12,043	€ 12,061	€ 13,283
Net debt : group equity ratio	32:68	30:70	33:67

The amount of outstanding funds that the entity is obligated to repay.

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings]

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The amount of residual interest in the assets of the entity after deducting all its liabilities.

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The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest.

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The non-current portion of non-current borrowings. [Refer: Borrowings]

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The amount of net debt of the entity.

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The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Total for all subsidiaries [member]]

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Net debt and group equity ratio

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