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Earnings per share - Shares (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings per share |  |  |
Weighted average number of shares used for basic earnings per share | 3,592,249,603 | 3,601,140,133 | 3,601,140,133

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- Definition Disclosure Of Earnings Per Share Explanatory. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_b&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration