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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Summary of Inventory

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

 

(Stated in millions)

 

 

 

 

 

 

 

 

 

 

Sept. 30,

 

 

Dec. 31,

 

 

2017

 

 

2016

 

Raw materials & field materials

$

1,898

 

 

$

1,720

 

Work in progress

 

537

 

 

 

610

 

Finished goods

 

1,873

 

 

 

1,895

 

 

$

4,308

 

 

$

4,225