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Investments in equity accounted units - Additional information (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Investments in equity accounted units [Line Items]
Investments in equity accounted units with shares listed on recognised stock exchanges	$ 0	$ 0
Net debt of the Group	(255,000,000)	3,845,000,000	$ 9,587,000,000
Investment in equity accounted units [member]
Disclosure of Investments in equity accounted units [Line Items]
Net debt of the Group	$ 1,158,000,000	$ 1,244,000,000

X

- Definition

The amount of net debt of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2017-03-09

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Disclosure of Investments in equity accounted units [Line Items]

+ References

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- Definition

Investments Accounted for Using Equity Method, With Shares Listed on Stock Exchanges

+ References

No definition available.

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