Inventories

3 Months Ended

Mar. 31, 2023

Inventory Disclosure [Abstract]

Inventories

Inventories

($ in millions)	March 31, 2023	December 31, 2022
Finished products	$1,441	$1,209
Work in process	282	238
Raw materials	833	784
Supplies	43	41
Total Inventories	$2,599	$2,272

Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 16% and 21% of total inventories at March 31, 2023 and December 31, 2022, respectively. If the first-in, first-out ("FIFO") method of inventory valuation had been used, inventories would have been $281 million and $272 million higher as of March 31, 2023 and December 31, 2022, respectively.