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Inventories and Contracts in Progress (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 2,444,000,000 | $ 2,038,000,000
Work-in-process | 2,292,000,000 | 3,366,000,000
Finished goods | 4,332,000,000 | 3,845,000,000
Contracts in progress | 0 | 10,205,000,000
Inventory before payments and billings | 9,068,000,000 | 19,454,000,000
Progress payments, secured by lien, on U.S. Government contracts | 0 | 236,000,000
Billings on contracts in progress | 0 | 9,337,000,000
Inventories and contracts in progress, net | 9,068,000,000 | 9,881,000,000
Inventory [Line Items] |  |
Inventory Costs in Excess of Average Cost Per Unit | 0 | 438,000,000
UTC Aerospace Systems [Member] |  |
Inventory [Line Items] |  |
Other Inventory, Capitalized Costs, Gross | $ 0 | $ 127,000,000

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