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Inventories
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories

4.   Inventories

A summary of inventories, which are stated at the lower of average cost or net realizable value, follows:  

 

(Stated in millions)

 

 

 

 

 

 

 

 

 

 

Mar. 31,

 

 

Dec. 31,

 

 

2018

 

 

2017

 

Raw materials & field materials

$

1,910

 

 

$

1,846

 

Work in progress

 

556

 

 

 

503

 

Finished goods

 

1,708

 

 

 

1,697

 

 

$

4,174

 

 

$

4,046