Segment Information (Details 6) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 37,653	$ 35,128
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	34,122	21,900
Operating Segments [Member] | Aerospace Systems
Segment Reporting Information [Line Items]
Total assets	9,750	8,497
Operating Segments [Member] | Innovation Systems
Segment Reporting Information [Line Items]
Total assets	10,368	0
Operating Segments [Member] | Mission Systems
Segment Reporting Information [Line Items]
Total assets	11,047	10,389
Operating Segments [Member] | Technology Services
Segment Reporting Information [Line Items]
Total assets	2,957	3,014
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 3,531	$ 13,228