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Financial instruments and risk management - Summary of financial assets by categories (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial assets [Line Items] |  |
Cash and cash equivalents | $ 10,550 | $ 8,201
Trade and other receivables | 2,985 | 3,047
Equity shares and quoted funds | 136 | 156
Other investments, including loans | 1,152 | 454
Currency and commodity derivatives: designated as hedges |  | 1
Derivatives and embedded derivatives not related to net debt not designated as hedges | 168 | 423
Derivatives related to net debt | 99 | 108
Loans to equity accounted units including quasi equity loans | 198 | 202
Total financial assets | 15,288 | 12,592
Loans and receivables [member] |  |
Disclosure of financial assets [Line Items] |  |
Cash and cash equivalents | 10,550 | 8,201
Trade and other receivables | 2,895 | 2,904
Other investments, including loans | 15 | 14
Loans to equity accounted units including quasi equity loans | 198 | 202
Total financial assets | 13,658 | 11,321
Available for sale securities [member] |  |
Disclosure of financial assets [Line Items] |  |
Equity shares and quoted funds | 136 | 156
Total financial assets | 136 | 156
Held at fair value [member] |  |
Disclosure of financial assets [Line Items] |  |
Trade and other receivables | 90 | 143
Other investments, including loans | 1,125 | 431
Currency and commodity derivatives: designated as hedges |  | 1
Derivatives and embedded derivatives not related to net debt not designated as hedges | 168 | 423
Derivatives related to net debt | 99 | 108
Total financial assets | 1,482 | 1,106
Held to maturity assets [member] |  |
Disclosure of financial assets [Line Items] |  |
Other investments, including loans | 12 | 9
Total financial assets | $ 12 | $ 9

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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 2016-01-13 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_25&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_35H&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_35I&doctype=Standard -URIDate 2016-03-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_35M&doctype=Standard -URIDate 2016-03-31 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_35N&doctype=Standard -URIDate 2016-03-31 + Details
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