19.

Inventories


Million US dollar	2018		2017
Prepayments		123		101
Raw materials and consumables		2 387		2 304
Work in progress		363		387
Finished goods		1 215		1 216
Goods purchased for resale		146		111

Inventories		4 234		4 119
Inventories other than work in progress
Inventories stated at net realizable value		59		57

The cost of inventories recognized as an expense in 2018 amounts to 20 359m US dollar, included in cost of sales (2017: 21 386m US dollar; 2016: 17 803m US dollar).

Impairment losses on inventories recognized in 2018 amount to 72m US dollar (2017: 72m US dollar; 2016: 70m US dollar).