Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

($ in millions)	March 31, 2017		December 31, 2016
Finished products	$	1,103	$	969
Work in process	173		165
Raw materials	414		375
Supplies	37		37
Total Inventories	$	1,727	$	1,546