DISCONTINUED OPERATIONS AND DIVESTITURES - Additional Information (Details) - USD ($)						3 Months Ended		12 Months Ended
	Apr. 28, 2017	Jan. 01, 2017	Apr. 08, 2016	Feb. 04, 2013	Dec. 05, 2012	Mar. 31, 2017	Jan. 01, 2016	Jun. 29, 2018	Jun. 30, 2017	Jul. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, per diluted share (in dollars per share)								$ (0.02)	$ (0.68)	$ (2.28)
Non-cash asset impairment change								$ 0	$ 240,000,000	$ 367,000,000
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]
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net	$ 646,000,000
Gain (loss) on sale of discontinued operations, before tax	(28,000,000)
Gain (loss) on disposal of discontinued operation, net of tax	$ 55,000,000
Discontinued operations, per diluted share (in dollars per share)	$ 0.44
Discontinued operation, period of continuing involvement after disposal	18 months
Goodwill assigned to disposal group						$ 487,000,000
Non-cash impairment asset charge in discontinued operations						240,000,000
Goodwill impairment loss						$ 228,000,000
Discontinued Operations, Disposed of by Sale | Caprock
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net		$ 368,000,000
Gain (loss) on sale of discontinued operations, before tax		14,000,000
Gain (loss) on disposal of discontinued operation, net of tax		$ 61,000,000
Discontinued operations, per diluted share (in dollars per share)		$ 0.49
Discontinued Operations, Disposed of by Sale | Caprock | Critical Networks
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment loss										290,000,000
Non-cash asset impairment change										367,000,000
Discontinued Operations, Disposed of by Sale | Broadcast Communications
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of discontinued operations, before tax							$ (21,000,000)
Gain (loss) on disposal of discontinued operation, net of tax							$ (17,000,000)
Discontinued operations, per diluted share (in dollars per share)							$ (0.14)
Cash consideration received on sale of disposal group				$ 160,000,000
Asset sale agreement					$ 225,000,000
Asset sale agreement promissory note				15,000,000
Asset sale agreement earnout				$ 50,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Aerostructures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of discontinued operations, before tax										10,000,000
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]
Gain (loss) on sale of discontinued operations, before tax										$ 10,000,000
Asset sale agreement cash			$ 187,000,000
Capital lease obligation assumed			$ 23,000,000