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Earnings per share - Additional Information (Detail)	Jun. 30, 2019 shares
Ordinary shares [member]
Earnings per share [line items]
Ordinary shares in issue	1,332,703,852
Own shares [member]
Earnings per share [line items]
Ordinary shares in issue	70,799,200

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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