Earnings per share (Details) - EUR (€) € / shares in Units, € in Millions, shares in Millions	6 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Weighted average number of shares for diluted earnings per share
Weighted average number of shares for basic earnings per share (in shares)	29,535	29,410
Effect of dilutive potential shares: restricted shares and share options (in shares)	75
Weighted average number of shares for diluted earnings per share (in shares)	29,610	29,410
Earnings per share attributable to owners of the parent during the period
Profit Loss Attributable to Owners of Parent from Continuing Operations	€ 1,314	€ (2,128)
Basic profit/(loss) per share	€ 4.45	€ (7.24)
Diluted profit/(loss) per share	€ 4.44	€ (7.24)

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's restricted shares and share options.

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The profit (loss) attributable to owners of the parent from continuing operations.

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