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Trade and other receivables - Summary of trade and other receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Trade And Other Receivables [Abstract] |  |
Non-current trade receivables | $ 1 |
Other non-current receivables | 526 | $ 347
Non-current prepayment of tolling charges to jointly controlled entities | 269 | 267
Non-current pension surpluses | 871 | 625
Non-current other prepayments | 57 | 103
Non-current trade and other receivables | 1,724 | 1,342
Current trade receivables | 2,314 | 2,283
Other current receivables | 820 | 880
Current amounts due from equity accounted units | 30 | 31
Current other prepayments | 279 | 266
Current trade and other receivables | 3,443 | 3,460
Trade receivables | 2,315 | 2,283
Other receivables | 1,346 | 1,227
Prepayment of tolling charges to jointly controlled entities | 269 | 267
Pension surpluses | 871 | 625
Amounts due from equity accounted units | 30 | 31
Other prepayments | 336 | 369
Trade and other receivables | $ 5,167 | $ 4,802

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- Definition The amount of non-current prepayments. [Refer: Prepayments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_78_b&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of non-current trade receivables and non-current other receivables. [Refer: Non-current trade receivables; Other non-current receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_h&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_78_b&doctype=Standard -URIDate 2016-03-31 + Details
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