Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories

($ in millions)	June 30, 2018		December 31, 2017
Finished products		$1,218		$1,083
Work in process	204		177
Raw materials	500		437
Supplies	34		33
Total Inventories		$1,956		$1,730