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Consolidated net debt - Exchange gains/(losses) on US dollar net debt and intragroup balances (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial liabilities [Abstract]
Other current non-financial liabilities	$ 904	$ 922
Disclosure - Consolidated net debt - Exchange gains/(losses) on US dollar net debt and intragroup balances (Parenthetical) (Detail) [Line Items]
Highly liquid financial assets held in managed investment funds classified as held for trading	958	250
Borrowings (including finance leases) Excluding Overdraft [Member]
Disclosure of financial liabilities [Abstract]
Finance lease liabilities	3	12
Total other current financial liabilities	352	205
Other current non-financial liabilities	524	557
Over Draft [Member]
Disclosure of financial liabilities [Abstract]
Current financial liabilities	$ 3	$ 12

X

- Definition

The amount of current financial liabilities. [Refer: Financial liabilities]

+ References

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-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 25
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The amount of liabilities related to finance leases.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
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-IssueDate 2016-01-13
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The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss]

+ References

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-Note Expiry date 2018-01-01
-Name IFRS
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-IssueDate 2016-01-13
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- Definition

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+ References

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-Name IFRS
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-IssueDate 2016-01-13
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