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Inventories
 12 Months Ended
Dec. 31, 2017
Inventories  
Inventories

7.  Inventories

 

 

 

 

 

 

 

 

 

 

December 31,

($ in millions)

    

2017

    

2016

 

 

 

 

 

 

 

Raw materials and supplies

 

$

691

 

$

607

Work-in-process and finished goods

 

 

902

 

 

839

Less inventory reserves

 

 

(67)

 

 

(33)

 

 

$

1,526

 

$

1,413