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Contingencies and commitments - Summary of capital commitments (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of commitments and contingencies [Line Items]
Capital commitments	$ 4,053	$ 2,283
Joint ventures [Member]
Disclosure of commitments and contingencies [Line Items]
Capital commitments	93	116
Within 1 year [member]
Disclosure of commitments and contingencies [Line Items]
Capital commitments	3,069	1,742
Within 1 year [member] | Joint ventures [Member]
Disclosure of commitments and contingencies [Line Items]
Capital commitments	92	115
Between 1 and 3 years [member]
Disclosure of commitments and contingencies [Line Items]
Capital commitments	851	439
Between 1 and 3 years [member] | Joint ventures [Member]
Disclosure of commitments and contingencies [Line Items]
Capital commitments	1	1
Between 3 and 5 years [member]
Disclosure of commitments and contingencies [Line Items]
Capital commitments	133	66
More than 5 years [member]
Disclosure of commitments and contingencies [Line Items]
Capital commitments	$ 0	$ 36

X

- 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 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

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- Definition

Disclosure of commitments and contingencies [Line Items]

+ References

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