Investment income and financing costs (Details) - EUR (€) € in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Investment income:
Financial assets measured at amortised cost	€ 306	€ 157	€ 286
Financial assets measured at fair value through profit and loss	24	91	147
Investment income	330	248	433
Financial liabilities measured at amortised cost
Bonds	1,722	1,580	1,194
Lease liabilities	374	330
Bank loans and other liabilities	463	626	419
Interest on derivatives	(485)	(354)	(139)
Mark-to-market on derivatives	(1,070)	1,162	424
Foreign exchange	23	205	190
Financing costs	1,027	3,549	2,088
Net financing costs	697	3,301	1,655
Interest capitalised	€ 17	€ 25	€ 0

The amount of costs associated with financing activities of the entity.

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- Definition

The gain (loss) recognised on designation of a financial instrument, or a proportion of it, as measured at fair value through profit or loss, because a credit derivative is used to manage the credit risk of that financial instrument. [Refer: Credit risk [member]; Derivatives [member]; Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of interest expense on bonds issued. [Refer: Interest expense; Bonds issued]

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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
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- Definition

The amount of interest income on financial assets held for trading. [Refer: Interest income; Financial assets at fair value through profit or loss, classified as held for trading]

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- Definition

The amount of interest income on loans and receivables. [Refer: Interest income; Loans and receivables]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of investment income, such as interest and dividends.

+ References

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- Definition

The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

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- Definition

The amount of financing costs net of investment income.

+ References

No definition available.

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- Definition

The amount of interest expense on bank loans and other liabilities

+ References

No definition available.

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- Definition

The amount of interest income on derivatives.

+ References

No definition available.

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- References

No definition available.

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