INFORMATION ON BUSINESS SEGMENTS - Total Assets For Each Business Segment (Details) - USD ($) $ in Millions	Sep. 27, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 50,773	$ 47,528
Business Segments
Segment Reporting Information [Line Items]
Total assets	39,935	38,734
Business Segments | Aeronautics
Segment Reporting Information [Line Items]
Total assets	10,434	9,109
Business Segments | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total assets	5,112	5,030
Business Segments | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Total assets	18,244	18,751
Business Segments | Space
Segment Reporting Information [Line Items]
Total assets	6,145	5,844
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 10,838	$ 8,794