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Contingencies and commitments - Summary of capital commitments (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Capital Commitments
Capital Commitments	$ 2,283	$ 2,641
Due within 1 year [member]
Capital Commitments
Capital Commitments	1,742	2,052
Between 1 and 3 years [member]
Capital Commitments
Capital Commitments	439	531
Between 3 and 5 years [member]
Capital Commitments
Capital Commitments	66	58
More than 5 years [member]
Capital Commitments
Capital Commitments	36
Joint ventures [Member]
Capital Commitments
Capital Commitments	116	29
Joint ventures [Member] | Due within 1 year [member]
Capital Commitments
Capital Commitments	115	$ 29
Joint ventures [Member] | Between 1 and 3 years [member]
Capital Commitments
Capital Commitments	$ 1

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- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

+ Details

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- References

No definition available.

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