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Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal | On November 6, 2015, we completed the sale of Sikorsky to Lockheed Martin Corp. |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax [Abstract] |  |
Discontinued Operations: (Loss) gain on disposal | $ 0 | $ 18
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |
Net cash outflows from discontinued operations | $ 0 | $ (2,227)

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