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Inventories, net | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories, net | Inventories, net Inventories, net consisted of the following (in millions):
|  | 2017 |  |  | 2016 |
Work-in-process, primarily related to long-term contracts and programs in progress |  | $ | 6,510 |  |  | $ | 7,864 |
Spare parts, used aircraft and general stock materials |  | 811 |  |  | 833 |
Other inventories |  | 1,134 |  |  | 719 |
Total inventories |  | 8,455 |  |  | 9,416 |
Less: customer advances and progress payments |  | (3,968 | ) |  | (4,746 | )
Total inventories, net |  | $ | 4,487 |  |  | $ | 4,670 |
Work-in-process inventories at December 31, 2017 and 2016 included general and administrative costs of $509 million and $529 million. General and administrative costs incurred and recorded in inventories totaled $3.5 billion in 2017, $3.3 billion in 2016 and $2.7 billion in 2015. General and administrative costs charged to cost of sales from inventories totaled $3.5 billion in 2017, $3.3 billion in 2016 and $2.8 billion in 2015.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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