Business Segment Reporting (Total Assets) (Details) - USD ($) $ in Millions |
Oct. 02, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Total assets | $ 29,452 | $ 29,281 |
| Corporate [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 4,595 | 5,306 |
| Integrated Defense Systems | Operating Segments [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 4,473 | 4,132 |
| Intelligence, Information and Services | Operating Segments [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 4,407 | 4,380 |
| Missile Systems | Operating Segments [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 6,946 | 6,561 |
| Space and Airborne Systems | Operating Segments [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | 6,532 | 6,416 |
| Forcepoint | Operating Segments [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Total assets | $ 2,499 | $ 2,486 |