Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

At December 31, 2018 and 2017, inventory by major classification was as follows:

	December 31
	2018		2017
	(Millions)
Finished goods	$	1,116	$	300
Work in process	562		268
Raw materials	457		178
Materials and supplies	110		74
Total inventories	$	2,245	$	820