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Basis of Preparation - Summary of Financial assets classification and measurement (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Disclosure Of Financial Assets [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 5,989 | $ 10,550 | $ 7,746
Trade and other receivables | [1] | 2,713 |  |
Investments in equity shares and funds |  | 141 |  |
Other investments, including loans |  | 2,187 |  |
Forward contracts designated as hedges |  | 24 |  |
Forward contracts and option contracts not designated as hedges |  | 281 |  |
Derivatives related to net debt |  | 63 |  |
Loans to equity accounted units including quasi equity loans |  | 179 |  |
Financial Assets |  | 11,577 |  |
Held at Fair Value through Profit or Loss ('FVPL') |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |
Cash and cash equivalents |  | 3,130 |  |
Trade and other receivables | [1] | 765 |  |
Investments in equity shares and funds |  | 81 |  |
Other investments, including loans |  | 2,172 |  |
Forward contracts designated as hedges |  | 24 |  |
Forward contracts and option contracts not designated as hedges |  | 281 |  |
Derivatives related to net debt |  | 63 |  |
Financial Assets |  | 6,516 |  |
Held at FVOCI (designated) |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |
Investments in equity shares and funds |  | 60 |  |
Financial Assets |  | 60 |  |
Held at Amortised Cost |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |
Cash and cash equivalents |  | 2,859 |  |
Trade and other receivables | [1] | 1,948 |  |
Other investments, including loans |  | 15 |  |
Loans to equity accounted units including quasi equity loans |  | 179 |  |
Financial Assets |  | $ 5,001 |  |
[1] | Trade and other receivables exclude non-financial assets such as pension surpluses, prepayment of tolling charges to joint operations and other prepayments within other receivables and will therefore differ to the amounts shown in the balance sheet.

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard -URIDate 2017-03-09 + Details
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