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Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 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	$ (4)	$ 0	$ 11
Net Cash Provided by (Used in) Discontinued Operations [Abstract]
Net cash outflows from discontinued operations			0	(2,480)
Income tax (benefit) expense	$ 0	$ (40)	$ 0	$ 12

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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