Discontinued Operations (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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 |