Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	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)