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Inventories | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Inventories [Abstract] |
Inventories | Notes to the 2018 financial statements continued 16 Inventories
|  | 2018 |  | 2017 |
| US$m |  | US$m |
Raw materials and purchased components |  | 734 |  |  | 648 |
Consumable stores |  | 862 |  |  | 875 |
Work in progress |  | 1,026 |  |  | 1,082 |
Finished goods and goods for resale |  | 977 |  |  | 1,027 |
Total inventories |  | 3,599 |  |  | 3,632 |
Comprising: |  |  |  |  |  |
Expected to be used within one year |  | 3,447 |  |  | 3,472 |
Expected to be used after more than one year |  | 152 |  |  | 160 |
Total inventories |  | 3,599 |  |  | 3,632 |
During 2018, the Group recognised inventory write-downs, net of reversals, amounting to US$48 million. 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, partly offset by inventory write-offs of US$74 million. At 31 December 2018, US$566 million (2017: US$611 million) of inventories were pledged as security for liabilities.

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