Segment Information Assets (Details 6) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 41,089	$ 37,653
Operating Segments [Member] | Aerospace Systems
Segment Reporting Information [Line Items]
Total assets	10,772	9,750
Operating Segments [Member] | Innovation Systems
Segment Reporting Information [Line Items]
Total assets	11,551	10,368
Operating Segments [Member] | Mission Systems
Segment Reporting Information [Line Items]
Total assets	11,641	11,047
Operating Segments [Member] | Technology Services
Segment Reporting Information [Line Items]
Total assets	3,089	2,957
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 4,036	$ 3,531