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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Inventories [Abstract] |
Summary of inventories |
| 2019 US$m |  | 2018 US$m |
Raw materials and purchased components | 675 |  | 734 |
Consumable stores | 925 |  | 862 |
Work in progress | 1,066 |  | 1,026 |
Finished goods and goods for resale | 936 |  | 977 |
Total inventories | 3,602 |  | 3,599 |
Comprising: |  |
Expected to be used within one year | 3,463 |  | 3,447 |
Expected to be used after more than one year | 139 |  | 152 |
Total inventories | 3,602 |  | 3,599 |

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