BUSINESS SEGMENTS (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) segment	Jul. 01, 2016 USD ($)	Jul. 03, 2015 USD ($)
Selected information by business segment and geographical area
Total Assets	$ 10,090	$ 10,090	$ 12,009
Capital Expenditures		119	154	$ 148
Depreciation and Amortization		311	361	244
Other intangible assets	1,104	1,104	1,231
Total revenue		5,900	5,992	3,885
Non-operating income (loss)		2	10	(108)
Net interest expense		(170)	(181)	(128)
Income from continuing operations before income taxes		$ 905	884	396
Number of reportable segments | segment		3
Cost of product sales and services		$ 3,811	3,900	2,370
Restructuring charges		1,016	1,037	883
Amortization of intangible assets from Exelis Inc. acquisition		128	132	11
US Operations
Selected information by business segment and geographical area
Revenue		5,639	5,798	3,756
Long-lived assets	896	896	917	1,020
International Operations
Selected information by business segment and geographical area
Revenue		261	194	129
Long-lived assets	8	8	7	11
Discontinued operations
Selected information by business segment and geographical area
Capital Expenditures		4	19	34
Depreciation and Amortization		39	78	84
Communication Systems | Workforce reductions, facility consolidation and other items
Selected information by business segment and geographical area
Segment Operating Income (Loss)			20
Cost of product sales and services			14
Restructuring charges			6
Operating Segments | Communication Systems
Selected information by business segment and geographical area
Total Assets	1,534	1,534	1,667
Capital Expenditures		14	16	26
Depreciation and Amortization		64	63	65
Total revenue		1,753	1,864	1,836
Segment Operating Income (Loss)		524	522	553
Operating Segments | Electronic Systems
Selected information by business segment and geographical area
Total Assets	4,094	4,094	4,094
Capital Expenditures		40	40	29
Depreciation and Amortization		29	56	36
Total revenue		2,251	2,233	1,019
Segment Operating Income (Loss)		464	430	163
Operating Segments | Space and Intelligence Systems
Selected information by business segment and geographical area
Total Assets	2,117	2,117	2,149
Capital Expenditures		34	38	52
Depreciation and Amortization		37	40	32
Total revenue		1,902	1,899	1,007
Segment Operating Income (Loss)		311	288	136
Corporate
Selected information by business segment and geographical area
Total Assets	2,345	2,345	4,099
Capital Expenditures		27	41	7
Depreciation and Amortization		142	124	27
Total revenue		(6)	(4)	23
Corporate eliminations		(3)	(5)	(10)
Corporate | Exelis
Selected information by business segment and geographical area
Other intangible assets	1,100	1,100	1,200
Unallocated corporate expense
Selected information by business segment and geographical area
Unallocated corporate expense		(223)	(180)	$ (210)
Net liability reduction for certain post-employment plans			101
Unallocated corporate expense | Exelis
Selected information by business segment and geographical area
Integration and other business acquisition related costs	$ 58		121
Amortization of intangible assets from Exelis Inc. acquisition		$ 109	$ 109