- Assets and Revenues by Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2017	Apr. 01, 2016	Jul. 01, 2016
Segment Reporting Information [Line Items]
Total assets	$ 11,107		$ 11,107		$ 12,009
Identifiable intangible assets	1,136		1,136		1,231
Income From Continuing Operations Before Income Taxes
Revenue	1,489	$ 1,550	4,358	$ 4,459
Non-operating income	0	(1)	2	0
Net interest expense	(42)	(46)	(129)	(138)
Income from continuing operations before income taxes	233	221	671	667
Business Segments (Textuals)
Cost of product sales and services	964	1,009	2,792	2,895
Engineering, selling and administrative expenses	250	273	768	759
Amortization of intangible assets from Exelis Inc. acquisition			99	99
Communication Systems | Workforce reductions, facility consolidation and other items [Member]
Income From Continuing Operations Before Income Taxes
Segment operating income				17
Business Segments (Textuals)
Cost of product sales and services		14
Engineering, selling and administrative expenses		3
Corporate
Segment Reporting Information [Line Items]
Total assets	3,201		3,201		4,099
Corporate | Exelis
Business Segments (Textuals)
Business combination, integration and other costs	8	25	38	95
Amortization of intangible assets from Exelis Inc. acquisition	27		82
Operating Segments | Communication Systems
Segment Reporting Information [Line Items]
Total assets	1,600		1,600		1,667
Income From Continuing Operations Before Income Taxes
Revenue	461	485	1,304	1,428
Segment operating income	140	151	379	405
Operating Segments | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Total assets	2,149		2,149		2,149
Income From Continuing Operations Before Income Taxes
Revenue	475	489	1,396	1,370
Segment operating income	76	75	231	208
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total assets	4,157		4,157		4,094
Income From Continuing Operations Before Income Taxes
Revenue	553	575	1,660	1,662
Segment operating income	115	111	360	311
Corporate eliminations, net
Income From Continuing Operations Before Income Taxes
Revenue	0	1	(2)	(1)
Corporate eliminations	(1)	(1)	(3)	(3)
Business Segments (Textuals)
Net liability reduction for certain post-employment benefit plans				101
Corporate eliminations, net | Exelis
Segment Reporting Information [Line Items]
Identifiable intangible assets	1,300		1,300		$ 1,400
Unallocated corporate income (expense)
Income From Continuing Operations Before Income Taxes
Unallocated corporate income (expense)	$ (55)	$ (68)	$ (169)	$ (116)