BUSINESS SEGMENTS Revenue by Economic Factors (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 6,801	$ 6,168	$ 5,897
Electronic Systems
Segment Reporting Information [Line Items]
Revenue	2,583	2,365	2,245
Space and Intelligence Systems
Segment Reporting Information [Line Items]
Revenue	2,057	1,913	1,904
United States
Segment Reporting Information [Line Items]
Revenue	6,530	5,854	5,637
United States | Electronic Systems
Segment Reporting Information [Line Items]
Revenue	2,095	1,890	1,769
United States | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Revenue	2,003	1,861	1,821
International
Segment Reporting Information [Line Items]
Revenue	271	314	260
International | Electronic Systems
Segment Reporting Information [Line Items]
Revenue	488	475	476
International | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Revenue	54	52	83
Fixed-price | Electronic Systems
Segment Reporting Information [Line Items]
Revenue	2,092	1,900	1,833
Fixed-price | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Revenue	748	544	448
Cost-reimbursable | Electronic Systems
Segment Reporting Information [Line Items]
Revenue	491	465	412
Cost-reimbursable | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Revenue	1,309	1,369	1,456
Prime contractor | Electronic Systems
Segment Reporting Information [Line Items]
Revenue	1,671	1,670	1,653
Prime contractor | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Revenue	1,409	1,384	1,369
Subcontractor | Electronic Systems
Segment Reporting Information [Line Items]
Revenue	912	695	592
Subcontractor | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Revenue	$ 648	$ 529	$ 535