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Earnings per share - Reconciliation Between Shares Used in Calculating Basic and Diluted EPS (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings per share [abstract]
Average shares used in basic EPS calculation	1,247.8	1,261.1	1,277.8
Dilutive share options outstanding	1.6	1.8	2.4
Other potentially issuable shares	11.8	12.9	15.8
Shares used in diluted EPS calculation	1,261.2	1,275.8	1,296.0

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 33
-IssueDate 2018-01-01
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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
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-Number 33
-IssueDate 2018-01-01
-Paragraph 70
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- Definition

Other potentially issuable shares.

+ References

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