Inventories, net (Tables)

12 Months Ended

Dec. 31, 2016

Inventories

Inventories, net consisted of the following (in millions):

	2016			2015
Work-in-process, primarily related to long-term contracts and programs in progress	$	7,864		$	8,081
Spare parts, used aircraft and general stock materials		833			1,030
Other inventories		719			740
Total inventories		9,416			9,851
Less: customer advances and progress payments		(4,746	)		(5,032)
Total inventories, net	$	4,670		$	4,819