INFORMATION ON BUSINESS SEGMENTS - Total Assets For Each Business Segment (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 47,840	$ 44,876
Business segments
Segment Reporting Information [Line Items]
Total assets	39,964	37,230
Business segments | Aeronautics
Segment Reporting Information [Line Items]
Total assets	9,750	8,435
Business segments | Missiles and Fire Control
Segment Reporting Information [Line Items]
Total assets	5,368	5,017
Business segments | Rotary and Mission Systems
Segment Reporting Information [Line Items]
Total assets	18,934	18,333
Business segments | Space
Segment Reporting Information [Line Items]
Total assets	5,912	5,445
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 7,876	$ 7,646