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Inventories and Contracts in Progress (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Inventory Costs in Excess of Average Cost Per Unit | $ 438 | $ 233
Raw materials | 2,038 | 2,040
Work-in-process | 3,366 | 2,787
Finished goods | 3,845 | 3,305
Contracts in progress | 10,205 | 9,395
Inventories before payments and billings | 19,454 | 17,527
Progress payments, secured by lien, on U.S. Government contracts | 236 | 130
Billings on contracts in progress | 9,337 | 8,693
Inventories and contracts in progress, net | 9,881 | 8,704
Inventory Valuation Reserves | $ 1,107 | $ 877
Percentage Of Inventory For Long Term Contracts Or Programs | 63.00% | 68.00%
Percentage Of Inventory For Long Term Contracts Scheduled For Delivery Within Succeeding 12 Months | 38.00% | 41.00%
UTC Aerospace Systems [Member] |  |
Inventory [Line Items] |  |
Capitalized Contract Development Costs | $ 127 | $ 140

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