DISCONTINUED OPERATIONS AND DIVESTITURES - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2017	Jan. 01, 2016	Jun. 30, 2017	Jul. 01, 2016	Jul. 03, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services			$ 1,039	$ 1,529	$ 1,245
Cost of product sales and services			(885)	(1,286)	(1,025)
Engineering, selling and administrative expenses			(91)	(150)	(123)
Impairment of goodwill and other assets			(240)	(367)	(16)
Non-operating loss			(7)	(4)	0
Income (loss) before income taxes			(184)	(278)	81
Gain (loss) on sale of discontinued operations, before tax			(11)	(21)	0
Income tax (expense) benefit			110	12	(34)
Discontinued operations, net of income taxes			(85)	(287)	47
Discontinued Operations, Disposed of by Sale | Broadcast Communications
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-operating loss			(2)	(4)
Gain (loss) on sale of discontinued operations, before tax		$ (21)
Income tax (expense) benefit				4
Adjustment to gain (loss) on discontinued operations			3	(21)
Discontinued Operations, Disposed of by Sale | IT Services | Critical Networks
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of discontinued operations, before tax			(28)
Discontinued Operations, Disposed of by Sale | Caprock | Critical Networks
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of discontinued operations, before tax	$ 14
Discontinued Operations, Held-for-sale or Disposed of by Sale | IT Services | Critical Networks
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services			895	1,168	781
Cost of product sales and services			(777)	(1,002)	(665)
Engineering, selling and administrative expenses			(68)	(84)	(64)
Impairment of goodwill and other assets			(240)	0	(2)
Non-operating loss			(9)	0	0
Income (loss) before income taxes			(199)	82	50
Gain (loss) on sale of discontinued operations, before tax			(28)	0	0
Income tax (expense) benefit			69	(30)	(16)
Discontinued operations, net of income taxes			(158)	52	34
Discontinued Operations, Held-for-sale or Disposed of by Sale | Caprock | Critical Networks
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services			144	361	464
Cost of product sales and services			(108)	(284)	(360)
Engineering, selling and administrative expenses			(23)	(66)	(59)
Impairment of goodwill and other assets			0	(367)	(14)
Non-operating loss			4	0	0
Income (loss) before income taxes			17	(356)	31
Gain (loss) on sale of discontinued operations, before tax			14	0	0
Income tax (expense) benefit			41	38	(18)
Discontinued operations, net of income taxes			$ 72	(318)	13
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Aerostructures | Electronic Systems
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services				60	8
Income (loss) before income taxes				5	0
Gain (loss) on sale of discontinued operations, before tax				$ 10	$ 0