Earnings per share - Narrative (Details) shares in Millions	12 Months Ended
Dec. 31, 2023 shares	Dec. 31, 2022 shares	Dec. 31, 2021 shares
Disclosure of earnings per share [Abstract]
Number of shares reserved for issue under options and contracts for sale of shares (in shares)	180	198	19
Number of instruments that are antidilutive in period presented	41	63	143

The number of shares reserved for issue under options and contracts for the sale of shares.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 79
-Subparagraph a
-Clause vii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_vii&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant