Segment Information Assets (Details 6) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 44,469	$ 41,089
Operating Segments [Member] | Aeronautics Systems
Segment Reporting Information [Line Items]
Total assets	8,997	9,104
Operating Segments [Member] | Defense Systems
Segment Reporting Information [Line Items]
Total assets	7,352	7,420
Operating Segments [Member] | Mission Systems
Segment Reporting Information [Line Items]
Total assets	10,029	9,934
Operating Segments [Member] | Space Systems
Segment Reporting Information [Line Items]
Total assets	10,028	10,595
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 8,063	$ 4,036