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Inventories | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Inventories [Abstract] |
Inventories | 16 Inventories
|  | 2017 |  | 2016 |
| US$m |  | US$m |
Raw materials and purchased components |  | 648 |  |  | 470 |
Consumable stores |  | 875 |  |  | 840 |
Work in progress |  | 1,082 |  |  | 970 |
Finished goods and goods for resale |  | 1,027 |  |  | 800 |
|  | 3,632 |  |  | 3,080 |
Comprising: |  |  |  |  |  |
Expected to be used within one year |  | 3,472 |  |  | 2,937 |
Expected to be used after more than one year |  | 160 |  |  | 143 |
|  | 3,632 |  |  | 3,080 |
During 2017, the Group recognised a net inventory write-back of US$7 million. This comprised a US$81 million write-back of amounts previously written down due to an increase in realisable values, offset by inventory write offs of US$74 million. In 2016, inventory write-downs, net of reversals, amounted to US$51 million and in 2015 US$192 million. At 31 December 2017, US$611 million (2016: US$564 million) of inventories were pledged as security for liabilities.

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- Definition The entire disclosure for inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2016-01-13 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2016-03-30&anchor=sect_Disclosure&doctype=Standard -URIDate 2016-03-31 + Details
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