Inventories (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Inventories

($ in millions)	September 30, 2017		December 31, 2016
Finished products	$	1,136	$	947
Work in process	184		165
Raw materials	452		370
Supplies	33		32
Total Inventories	$	1,805	$	1,514