December 31,

($ in millions)

    

2016

    

2015

 

 

 

 

 

 

 

Raw materials and supplies

 

$
607

 

$
438

Work-in-process and finished goods

 

 
839

 

 
504

Less inventory reserves

 

 
(33)

 

 
(44)

 

 

$
1,413

 

$
898