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Financial instruments - Fair values and risk management - Guarantees (Details) - EUR (€) € in Millions	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Subsidiaries | Letters of guarantee
Disclosure of transactions between related parties [line items]
Letters of guarantee	€ 2,690	€ 2,760	€ 4,120

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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.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 35K
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35K_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:
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- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_FinancialGuaranteeContractsMember
Namespace Prefix:
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Period Type: