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Financial instruments and financial risk management - Sensitivity analysis (Details) - EUR (€) € in Millions | 12 Months Ended
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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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