BUSINESS SEGMENTS (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 29, 2018 USD ($)	Jun. 29, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Jul. 01, 2016 USD ($)	Jul. 03, 2015 USD ($)
Selected information by business segment and geographical area
Total Assets	$ 9,839	$ 9,839	$ 10,090
Capital Expenditures		136	119	$ 154
Depreciation and Amortization		259	311	361
Other intangible assets	989	989	1,104
Revenue from product sales and services — as reported		6,182	5,900	5,992
Segment Operating Income (Loss)		1,122	1,073	1,055
Non-operating income (loss)		(28)	2	10
Net interest expense		(168)	(170)	(181)
Income from continuing operations before income taxes		$ 926	905	884
Number of reportable segments | segment		3
Restructuring charges recorded as cost of products and sales services		$ 3,931	3,734	3,832
Restructuring charges recorded as engineering, selling and administrative expenses		1,129	1,093	1,105
Amortization expense related to intangible assets		117	126	129
Losses and other costs relate to debt refinancing		24	0	0
Fixed-rate debt
Selected information by business segment and geographical area
Losses and other costs relate to debt refinancing	22	27
Exelis
Selected information by business segment and geographical area
Amortization expense related to intangible assets		101	109	109
US Operations
Selected information by business segment and geographical area
Long-lived assets	892	892	896		$ 917
Revenue from product sales and services — as reported		5,869	5,639	5,798
International Operations
Selected information by business segment and geographical area
Long-lived assets	8	8	8		$ 7
Revenue from product sales and services — as reported		313	261	194
Discontinued operations
Selected information by business segment and geographical area
Capital Expenditures		0	4	19
Depreciation and Amortization		0	39	78
Communication Systems | Workforce reductions, facility consolidation and other items
Selected information by business segment and geographical area
Segment Operating Income (Loss)				20
Restructuring charges recorded as cost of products and sales services				14
Restructuring charges recorded as engineering, selling and administrative expenses				6
Operating Segments | Communication Systems
Selected information by business segment and geographical area
Total Assets	1,548	1,548	1,534
Capital Expenditures		26	14	16
Depreciation and Amortization		57	64	63
Revenue from product sales and services — as reported		1,903	1,753	1,864
Segment Operating Income (Loss)		571	524	522
Operating Segments | Electronic Systems
Selected information by business segment and geographical area
Total Assets	4,186	4,186	4,094
Capital Expenditures		57	40	40
Depreciation and Amortization		44	29	56
Revenue from product sales and services — as reported		2,373	2,251	2,233
Segment Operating Income (Loss)		441	464	430
Operating Segments | Space and Intelligence Systems
Selected information by business segment and geographical area
Total Assets	2,192	2,192	2,117
Capital Expenditures		33	34	38
Depreciation and Amortization		36	37	40
Revenue from product sales and services — as reported		1,921	1,902	1,899
Segment Operating Income (Loss)		336	311	288
Corporate
Selected information by business segment and geographical area
Total Assets	1,913	1,913	2,345
Capital Expenditures		20	27	41
Depreciation and Amortization		122	142	124
Revenue from product sales and services — as reported		(15)	(6)	(4)
Corporate | Exelis
Selected information by business segment and geographical area
Other intangible assets	$ 1,000	1,000	1,100
Unallocated corporate expense
Selected information by business segment and geographical area
Segment Operating Income (Loss)		(226)	(226)	(185)
Net liability reduction for certain post-employment plans				101
Adjustment for compensation expense		12
Unallocated corporate expense | Exelis
Selected information by business segment and geographical area
Amortization expense related to intangible assets		101	109	109
Integration and other business acquisition related costs		5	$ 58	$ 121
Unallocated corporate expense | Non-core Commercial Business | Business Exit
Selected information by business segment and geographical area
Business charges in connection with transition and exit costs		$ 47