Earnings per share - Summary of Basic and Diluted Earnings Per Ordinary Share (Details) - EUR (€) € / shares in Units, € in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings per share [abstract]
Profit attributable to shareholders	€ 982	€ 498	€ 1,090
Basic weighted average number of ordinary shares in issue (million) (in shares)	456,000,000	455,000,000	466,000,000
Effect of dilutive potential ordinary shares (million) (in shares)	1,000,000	1,000,000	3,000,000
Diluted weighted average number of ordinary shares in issue (million) (in shares)	457,000,000	456,000,000	469,000,000
Basic earnings per share (in EUR per share)	€ 2.15	€ 1.09	€ 2.34
Diluted earnings per share (in EUR per share)	€ 2.15	€ 1.09	€ 2.32
Number of shares issued and fully paid (in shares)	456,235,032	454,645,510	456,399,877
Antidilutive options excluded from diluted earnings per share share (in shares)	0	0	0

Instruments With Potential Future Dilutive Effect Not Included in Calculation Of Diluted Earnings Per Share, Amount

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- Definition

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

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The number of shares issued by the entity, for which full payment has been received.

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- Definition

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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