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Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Inventories [Abstract]  
Schedule of inventories
Inventories
 
 
As of December 31,
(In $ million)
 
2019
 
2018
Raw materials and consumables(a)
 
340

 
392

Work in progress(a)
 
178

 
200

Finished goods(a)
 
699

 
724

Engineering and maintenance materials
 
126

 
123

Provision against inventories
 
(31
)
 
(28
)
Total inventories
 
1,312

 
1,411



(a)
Amounts as of December 31, 2018 have been revised to correct immaterial classification errors.