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Related-party transactions (Tables) | 12 Months Ended
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Dec. 31, 2017
Related Party Transactions [Abstract] |
Summary of transactions and balances with equity accounted units | Transactions and balances with equity accounted units are summarised below. Purchases, trade and other receivables, and trade and other payables relate largely to amounts charged by equity accounted units for toll processing of alumina and purchasing of bauxite and aluminium. Sales relate largely to sales of alumina to equity accounted units for smelting into aluminium.
|  |  |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Income statement items | Note |  | US$m |  | US$m |  | US$m |
Purchases from equity accounted units |  |  |  |  | (993 | ) |  | (1,216 | ) |  | (1,249 | )
Sales to equity accounted units |  |  |  |  | 210 |  |  | 248 |  |  | 307 |
Cash flow statement items |  |  |  | US$m |  | US$m |  | US$m |
Dividends from equity accounted units |  |  |  |  | 817 |  |  | 253 |  |  | 210 |
Net funding of equity accounted units |  |  |  |  | (3 | ) |  | (12 | ) |  | 11 |
Balance sheet items |  |  |  | US$m |  | US$m |  | US$m |
Investments in equity accounted units (a) |  | 15 |  |  | 4,486 |  |  | 5,019 |  |  | 4,941 |
Loans to equity accounted units |  | 20 |  |  | 39 |  |  | 39 |  |  | 42 |
Loans from equity accounted units |  | 22 |  |  | (31 | ) |  | (49 | ) |  | (37 | )
Trade and other receivables: amounts due from equity accounted units (b) |  | 18 |  |  | 299 |  |  | 298 |  |  | 315 |
Trade and other payables: amounts due to equity accounted units |  | 25 |  |  | (175 | ) |  | (243 | ) |  | (231 | )
(a) | Investments in equity accounted units include quasi equity loans. Further information about investments in equity accounted units is set out in notes 35 and 36.
(b) | This includes prepayments of tolling charges.

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- Definition The disclosure of transactions between the entity and its related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2016-01-13 -Paragraph 18 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2016-03-30&anchor=para_18&doctype=Standard -URIDate 2016-03-31 + Details
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