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Combined Earnings Per Share - Summary of Movements in Shares (Detail) shares in Millions	6 Months Ended
	Jun. 30, 2018 shares
Earnings per share [abstract]
Number of shares, beginning balance(net of treasury shares)	2,738.9
Shares repurchased under the share buyback programme	(53.0)
Net movement in shares under incentive schemes	(0.3)
Number of shares, ending balance	2,685.6

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 79
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard
-URIDate 2017-03-09

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Increase (decrease) in number of shares outstanding through share-based payment transactions.

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- Definition

Shares repurchased under the share buyback programme.

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