Financial instruments - Fair values and risk management - Sensitivity analysis (Details) - EUR (€) € in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Interest rate risk
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of reasonably possible increase in risk assumption	1.00%
Percentage of reasonably possible decrease in risk assumption	1.00%
Changes in equity due to increase in risk component	€ 0	€ 0	€ 0
Foreign currency risk
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of reasonably possible increase in risk assumption	10.00%
Percentage of reasonably possible decrease in risk assumption	10.00%
Changes in profit loss due to increase in risk component	€ (18)	(63)	(63)
Changes in profit loss due to decrease in risk component	22	77	77
Changes in equity due to increase in risk component	(790)	(424)	(410)
Changes in equity due to decrease in risk component	€ 966	518	€ 501
Jet fuel risk
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of Reasonably Possible Increase (decrease) in Risk Assumption	10.00%
Percentage of reasonably possible increase in risk assumption	10.00%
Percentage of reasonably possible decrease in risk assumption	10.00%
Changes in profit loss due to increase in risk component	€ 0	0
Changes in profit loss due to decrease in risk component	0	0
Changes in equity due to increase in risk component	410	286
Changes in equity due to decrease in risk component	€ (410)	€ (286)

- 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

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The increase (decrease) in equity as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period.

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- Definition

The increase (decrease) in equity as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period.

+ References

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- Definition

The increase (decrease) in profit and loss as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period.

+ References

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- Definition

The increase (decrease) in profit and loss as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period.

+ References

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- Definition

The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument.

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- Definition

The reasonably possible percentage of the increase or decrease in the designated risk component used to determine the value of the financial instrument.

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- Definition

The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument.

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