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Inventories
 12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
The majority of our inventories are for business jet aircraft. Our inventories are stated at the lower of cost or net realizable value. Work in process represents largely labor, material and overhead costs associated with aircraft in the manufacturing process and is based primarily on the estimated average unit cost in a production lot. Raw materials are valued primarily on the first-in, first-out method. We record pre-owned aircraft acquired in connection with the sale of new aircraft at the lower of the trade-in value or the estimated net realizable value.
Inventories consisted of the following:
December 3120202019
Work in process$3,990 $4,419 
Raw materials1,712 1,733 
Finished goods30 30 
Pre-owned aircraft13 124 
Total inventories$5,745 $6,306