Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventories

Schedule of inventories

	September 30,		December 31,
($ in millions)	2018		2017
Raw materials and supplies	$	694	$	691
Work-in-process and finished goods		617		902
Less inventory reserves		(68)		(67)
	$	1,243	$	1,526