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Consolidated net debt - Analysis of changes in consolidated net debt (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure Of Financial Liabilities [Line Items] |  |  |
Overdrafts | $ 0 |  |
Other current non-financial liabilities | 710 |  | $ 904
Highly liquid financial assets held in managed investment funds classified as held for trading | 2,000 |  | 958
Borrowings (including finance leases) Excluding Overdraft [Member] |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |
Borrowings And Other Financial Liabilities | 13,726 |  | 16,052
Overdrafts |  |  | 3
Total other current financial liabilities | 282 |  | 352
Other current non-financial liabilities | $ 531 |  | $ 524
Overdraft |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |
Overdrafts |  | $ 3 |

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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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