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Financial instruments and financial risk management - Sensitivity analysis (Details) - EUR (€) € in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
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 profit loss due to increase in risk component	€ 38	€ 5	€ 9
Changes in profit loss due to decrease in risk component	(38)	(5)	(9)
Changes in equity due to increase in risk component	0	0	1
Changes in equity due to decrease in risk component	€ 0	€ 0	€ (1)
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%	10.00%	10.00%
Changes in profit loss due to increase in risk component	€ 246	€ 0	€ 0
Changes in profit loss due to decrease in risk component	(235)	0	0
Changes in equity due to increase in risk component	649	894	866
Changes in equity due to decrease in risk component	(531)	€ (731)	€ (709)
Jet fuel risk
Disclosure of nature and extent of risks arising from financial instruments [line items]
Changes in profit loss due to increase in risk component	26
Changes in profit loss due to decrease in risk component	(26)
Changes in equity due to increase in risk component	31
Changes in equity due to decrease in risk component	€ (31)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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. Excludes defined benefit plan obligations.

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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. Excludes defined benefit plan obligations.

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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. Excludes defined benefit plan obligations.

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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. Excludes defined benefit plan obligations.

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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. Excludes defined benefit plan obligations.

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The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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