Earnings per share - Schedule of Computation of Earnings Per Share (Details) - EUR (€) € / shares in Units, € in Millions, shares in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
EPS – Basic
Net profit attributable to shareholders’ equity (€ million)	€ 3,512	€ 3,701
Average number of shares (in millions of shares)	2,462.2	2,499.9
EPS - basic (in euros per share)	€ 1.43	€ 1.48
EPS – Diluted
Net profit attributable to shareholders’ equity (€ million)	€ 3,512	€ 3,701
Diluted average number of shares (in millions of shares)	2,473.2	2,511.0
EPS - diluted (in euros per share)	€ 1.42	€ 1.47

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 profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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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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