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Inventories - Current (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Inventories        
Raw materials and consumables $ 369 $ 305    
Mould parts 52 46    
Work-in-progress 85 72    
Finished goods 847 763    
Total current inventories $ 1,353 $ 1,186 $ 898 $ 935