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Other financial assets (including non-quasi equity loans to equity accounted units) - Summary of other financial assets including non-quasi equity loans to equity accounted units (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Other Assets [Abstract] |  |
Non-current derivative financial instruments | $ 238 | $ 508
Non-current equity shares and quoted funds | 45 | 73
Other non-current investments, including loans | 188 | 202
Non-current non-quasi equity loans to equity accounted units | 39 | 39
Non-current other financial assets (including loans to equity accounted units) | 510 | 822
Current derivative financial instruments | 29 | 24
Current equity shares and quoted funds | 91 | 83
Other current investments, including loans | 964 | 252
Current other financial assets (including loans to equity accounted units) | 1,084 | 359
Derivative financial instruments | 267 | 532
Equity shares and quoted funds | 136 | 156
Other investments, including loans | 1,152 | 454
Loans to equity accounted units | 39 | 39
Other financial assets (including loans to equity accounted units) | $ 1,594 | $ 1,181

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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of non-current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard -URIDate 2016-03-31 + Details
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