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Acquisitions and Divestitures - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed at Acquisition Date (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 06, 2015
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 10,807 | $ 10,764 | $ 10,695 |
Sikorsky Aircraft Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | $ 75
Receivables, net |  |  |  | 1,924
Inventories, net |  |  |  | 1,632
Other current assets |  |  |  | 46
Property, plant and equipment |  |  |  | 649
Goodwill |  |  |  | 2,842
Other noncurrent assets |  |  |  | 572
Deferred income taxes, noncurrent |  |  |  | 256
Total identifiable assets and goodwill |  |  |  | 12,067
Accounts payable |  |  |  | (565)
Customer advances and amounts in excess of costs incurred |  |  |  | (1,197)
Salaries, benefits, and payroll taxes |  |  |  | (105)
Other current liabilities |  |  |  | (430)
Customer contractual obligations |  |  |  | (507)
Other noncurrent liabilities |  |  |  | (185)
Total liabilities assumed |  |  |  | (2,989)
Total consideration |  |  |  | 9,078
Sikorsky Aircraft Corporation | Customer programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | 3,184
Sikorsky Aircraft Corporation | Trademarks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | $ 887

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