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Investment in Associates and Joint Ventures - Summarised Aggregated Financial Information for Individually Immaterial Associates and Joint Ventures (Detail) - Before exceptional items [member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of investment in associates and joint ventures [line items]
Operating profits before exceptional items	$ 7	$ 7	$ 6
Joint ventures [member]
Disclosure of investment in associates and joint ventures [line items]
Operating profits before exceptional items	5	1	1
Associates [member]
Disclosure of investment in associates and joint ventures [line items]
Operating profits before exceptional items	$ 2	$ 6	$ 5

X

- Definition

The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph B16
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16_a&doctype=Appendix&seq=2
-URIDate 2018-03-16

+ Details

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X

- Definition

Disclosure of investment in associates and joint ventures.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

Name:	ifrs-full_JointVenturesAxis=ifrs-full_AggregatedIndividuallyImmaterialJointVenturesMember
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X

- Details

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