Inventories (Tables)

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Inventories

($ in millions)	March 31, 2016		December 31, 2015
Finished products	$	1,187	$	1,082
Work in process	179		160
Raw materials	446		413
Supplies	51		50
Total Inventories	$	1,863	$	1,705