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Consolidated Shareholders' Equity - Summary of Number of Restricted Shares Not Yet Fully Vested (Details) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Restricted shares
Disclosure of classes of share capital [Line Items]
Total expense for restricted share plans	€ 146	€ 128
Number of shares not yet fully vested (in shares)	11,550,347	11,192,984
Restricted share plan 2023
Disclosure of classes of share capital [Line Items]
Number of shares not yet fully vested (in shares)	3,313,588	3,652,352
Restricted share plan 2022
Disclosure of classes of share capital [Line Items]
Number of shares not yet fully vested (in shares)	106,219	3,031,060
Restricted share plan 2021
Disclosure of classes of share capital [Line Items]
Number of shares not yet fully vested (in shares)	0	11,463
Restricted Share Plan 2024
Disclosure of classes of share capital [Line Items]
Number of shares not yet fully vested (in shares)	4,110,089	4,498,109
Restricted Share Plan 2025
Disclosure of classes of share capital [Line Items]
Number of shares not yet fully vested (in shares)	4,020,451	0

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- Definition

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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- Definition

The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 51
-Subparagraph a
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-URIDate 2024-03-27

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- Definition

Number of restricted shares not yet fully vested.

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