Business Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Jul. 03, 2015
Segment Reporting Information [Line Items]
Total assets	$ 12,564		$ 13,129
Revenue and income from continuing operations before income taxes by segment
Revenue from product sales and services	1,811	$ 1,155
Unallocated corporate expense	(75)	(17)
Corporate eliminations	(1)	(2)
Non-operating income	1	0
Income from continuing operations before income taxes	216	176
Business Segments (Textuals)
Identifiable intangible assets	1,729		1,775
Exelis [Member]
Business Segments (Textuals)
Identifiable intangible assets	1,600
Communication Systems [Member]
Segment Reporting Information [Line Items]
Total assets	1,853		1,906
Revenue and income from continuing operations before income taxes by segment
Revenue from product sales and services	454	389
Segment operating income	138	116
Space and Intelligence Systems [Member]
Segment Reporting Information [Line Items]
Total assets	2,139		2,096
Revenue and income from continuing operations before income taxes by segment
Revenue from product sales and services	435	253
Segment operating income	68	37
Electronic Systems [Member]
Segment Reporting Information [Line Items]
Total assets	2,517		2,513
Revenue and income from continuing operations before income taxes by segment
Revenue from product sales and services	374	109
Segment operating income	69	22
Critical Networks [Member]
Segment Reporting Information [Line Items]
Total assets	3,438		3,492
Revenue and income from continuing operations before income taxes by segment
Revenue from product sales and services	566	407
Segment operating income	63	42
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	2,617		$ 3,122
Revenue and income from continuing operations before income taxes by segment
Revenue from product sales and services	$ (18)	$ (3)