Business Segments (Details) $ in Millions	3 Months Ended
	Sep. 30, 2016 USD ($) segment	Oct. 02, 2015 USD ($)	Jul. 01, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	4
Number of reportable segments | segment	4
Total assets	$ 11,778		$ 11,996
Identifiable intangible assets	1,501		1,542
Income Before Income Taxes
Revenue	1,754	$ 1,811
Non-operating income	0	1
Net interest expense	(43)	(47)
Income before income taxes	225	216
Business Segments (Textuals)
Amortization of intangible assets from Exelis Inc. acquisition	33	33
Corporate Segment
Segment Reporting Information [Line Items]
Total assets	2,699		2,926
Corporate Segment | Exelis
Business Segments (Textuals)
Business combination, integration and other costs	17	23
Amortization of intangible assets from Exelis Inc. acquisition	33	33
Operating Segments | Communication Systems
Segment Reporting Information [Line Items]
Total assets	1,683		1,667
Income Before Income Taxes
Revenue	431	454
Segment operating income	119	138
Operating Segments | Space and Intelligence Systems
Segment Reporting Information [Line Items]
Total assets	2,150		2,149
Income Before Income Taxes
Revenue	453	435
Segment operating income	80	68
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total assets	2,268		2,253
Income Before Income Taxes
Revenue	361	374
Segment operating income	74	69
Operating Segments | Critical Networks
Segment Reporting Information [Line Items]
Total assets	2,978		3,001
Income Before Income Taxes
Revenue	527	566
Segment operating income	66	63
Corporate Non Segment
Income Before Income Taxes
Unallocated corporate income (expense)	(70)	(75)
Corporate Non Segment | Exelis
Segment Reporting Information [Line Items]
Identifiable intangible assets	1,400		$ 1,400
Corporate Eliminations | Corporate Segment
Income Before Income Taxes
Revenue	(18)	(18)
Corporate eliminations	$ (1)	$ (1)