Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventories

Schedule of inventories

	March 31,		December 31,
($ in millions)	2018		2017
Raw materials and supplies	$	719	$	691
Work-in-process and finished goods		794		902
Less inventory reserves		(66)		(67)
	$	1,447	$	1,526