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Issued share capital (Detail) - shares shares in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Text block [abstract]
Number of shares issued and fully paid, Beginning balance	1,328.2	1,332.7	1,332.7
Share cancellations	(32.1)	0.0	(4.5)
Number of shares issued and fully paid, Ending balance	1,296.1	1,332.7	1,328.2

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_iv&doctype=Standard
-URIDate 2019-03-27

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 79
-Subparagraph a
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_ii&doctype=Standard
-URIDate 2019-03-27

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Balance Type:	na
Period Type:	instant

X

- Definition

Text block [abstract]

+ References

No definition available.

+ Details

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