Inventories (Tables)

6 Months Ended

Jun. 30, 2017

Inventory Disclosure [Abstract]

Inventories

($ in millions)	June 30, 2017		December 31, 2016
Finished products	$	1,114	$	947
Work in process	186		165
Raw materials	433		370
Supplies	33		32
Total Inventories	$	1,766	$	1,514