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Inventories and Contracts in Progress (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 2,154 | $ 2,040
Work-in-process | 3,075 | 2,787
Finished goods | 3,528 | 3,305
Contracts in progress | 9,592 | 9,395
Inventory before payments and billings | 18,349 | 17,527
Progress payments, secured by lien, on U.S. Government contracts | 131 | 130
Billings on contracts in progress | 8,832 | 8,693
Inventories and contracts in progress, net | 9,386 | 8,704
Inventory [Line Items] |  |
Inventory Costs in Excess of Average Cost Per Unit | 275 | 233
UTC Aerospace Systems [Member] |  |
Inventory [Line Items] |  |
Other Inventory, Capitalized Costs, Gross | $ 127 | $ 140

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