Segment Information (Details 3) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 24,454	$ 26,572
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	19,571	19,474
Operating Segments [Member] | Aerospace Systems
Segment Reporting Information [Line Items]
Total assets	7,061	6,844
Operating Segments [Member] | Electronic Systems
Segment Reporting Information [Line Items]
Total assets	4,394	4,366
Operating Segments [Member] | Information Systems
Segment Reporting Information [Line Items]
Total assets	6,588	6,725
Operating Segments [Member] | Technical Services
Segment Reporting Information [Line Items]
Total assets	1,528	1,539
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 4,883	$ 7,098