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Inventories
 12 Months Ended
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.