Post employment benefits - Fair value of pension assets (Details) - EUR (€) € in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Post employment benefits
Investment fund	€ 604
Defined benefit pension plan
Post employment benefits
Cash and cash equivalents	247	€ 96
Investment fund	604	533
Total	7,632	6,906
Gain (loss) on return on plan assets	603	262
Defined benefit pension plan \| Level 1
Post employment benefits
Equity investments	1,376	1,018
Debt instruments	4,589	4,446
Property	26	18
Annuity policies	4	3
Defined benefit pension plan \| Level 2
Post employment benefits
Equity investments	294	197
Debt instruments	559	513
Property	494	391
Derivatives	1,557	1,110
Annuity policies	€ 996	€ 801

The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

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The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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The amount real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

+ References

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The amount that annuity policies constitute of the fair value of defined benefit plan assets.

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No definition available.

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- Definition

The amount of gain (loss) on return on plan assets under net defined benefit plan.

+ References

No definition available.

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