INFORMATION ON BUSINESS SEGMENTS - Total Assets For Each Business Segment (Details) - USD ($) $ in Millions	Sep. 26, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total assets	$ 51,843	$ 50,710
Business Segments
Segment Reporting Information [Line Items]
Total assets	41,783	39,355
Business Segments | Aeronautics
Segment Reporting Information [Line Items]
Total assets	12,369	9,903
Business Segments | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total assets	5,056	4,966
Business Segments | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Total assets	17,807	18,035
Business Segments | Space
Segment Reporting Information [Line Items]
Total assets	6,551	6,451
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 10,060	$ 11,355