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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Inventories [Abstract] |
Summary of 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 |

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