Segment Information (Details 3) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 25,614	$ 24,424
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	20,596	19,571
Operating Segments [Member] | Aerospace Systems
Segment Reporting Information [Line Items]
Total assets	7,523	7,049
Operating Segments [Member] | Mission Systems
Segment Reporting Information [Line Items]
Total assets	9,991	9,475
Operating Segments [Member] | Technology Services
Segment Reporting Information [Line Items]
Total assets	3,082	3,047
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 5,018	$ 4,853