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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories

5.   Inventories

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

 

(Stated in millions)

 

 

 

 

 

 

 

 

 

 

Jun. 30,

 

 

Dec. 31,

 

 

2017

 

 

2016

 

Raw materials & field materials

$

1,701

 

 

$

1,720

 

Work in progress

 

570

 

 

 

610

 

Finished goods

 

2,067

 

 

 

1,895

 

 

$

4,338

 

 

$

4,225