BUSINESS SEGMENTS - Textual (Details) $ in Millions	12 Months Ended
	Jun. 30, 2017 USD ($) segment	Jul. 01, 2016 USD ($)	Jul. 03, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Depreciation and amortization for intangible assets, capitalized software and debt issuance costs	$ 137	$ 140	$ 48
Export revenue	$ 1,300	$ 1,200	$ 1,100
Total Revenue | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage (as percent)	5.00%	5.00%	5.00%
Total Revenue | Government Contracts Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage (as percent)	74.00%	77.00%	66.00%
Total Revenue | Product Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage (as percent)	22.00%	20.00%	29.00%
Sales Revenue, Services, Net | Product Concentration Risk | Communication Systems
Segment Reporting Information [Line Items]
Concentration risk percentage (as percent)	13.00%
Sales Revenue, Services, Net | Product Concentration Risk | Electronic Systems
Segment Reporting Information [Line Items]
Concentration risk percentage (as percent)	12.00%
Sales Revenue, Services, Net | Product Concentration Risk | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Concentration risk percentage (as percent)	34.00%