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Shareholders' equity and dividends - share buyback and treasury shares (Details)	12 Months Ended
	Dec. 31, 2020 shares	Dec. 31, 2019 shares
Employees share saving plan [Member]
Share saving plan at 1 January	10,074,712	10,352,671
Purchase	4,604,106	3,403,469
Allocated to employees	(3,236,327)	(3,681,428)
Share saving plan at 31 December	11,442,491	10,074,712
Share buyback programme [member]
Share buy-back programme at 1 January	23,578,410	0
Purchase	3,142,849	23,578,410
Cancellation	(26,721,259)	0
Share buy-back programme at 31 December	0	23,578,410

X

- Definition

Number of shares decreased through cancellation during the year.

+ References

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- Definition

Number of shares increasred through purchases during the year.

+ References

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- Definition

The number of share options outstanding in a share-based payment arrangement.

+ References

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

The number of share options exercised in a share-based payment arrangement.

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The number of share options granted in a share-based payment arrangement.

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- Definition

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

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