Inventories (Tables)

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Inventories

($ in millions)	September 30, 2016		December 31, 2015
Finished products	$	1,063	$	1,055
Work in process	178		161
Raw materials	398		402
Supplies	37		41
Total Inventories	$	1,676	$	1,659