Note 7 – Inventories, net

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

Work-in-process inventories at December 31, 2016 and 2015 included general and administrative costs of $529 million and $565 million. General and administrative costs incurred and recorded in inventories totaled $3.3 billion in 2016, $2.7 billion in 2015 and $2.5 billion in 2014. General and administrative costs charged to cost of sales from inventories totaled $3.3 billion in 2016, $2.8 billion in 2015 and $2.5 billion in 2014.