Inventories

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Inventories

5. Inventories

At March 31, 2021 and December 31, 2020, inventory by major classification was as follows:

	March 31, 2021		December 31, 2020
Finished goods	$	801	$	758
Work in process	492		449
Raw materials	442		441
Materials and supplies	95		95
Total inventories	$	1,830	$	1,743