DISCONTINUED OPERATIONS AND DIVESTITURES - Income Statement (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 01, 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, net of income taxes			$ (3)	$ (85)	$ (287)
Discontinued Operations, Held-for-sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services			0	1,039	1,529
Cost of product sales and services			0	(885)	(1,286)
Engineering, selling and administrative expenses			0	(91)	(150)
Impairment of goodwill and other assets			0	(240)	(367)
Non-operating loss, net			(8)	(7)	(4)
Income (loss) before income taxes			(8)	(184)	(278)
Gain (loss) on sale of discontinued operations, before tax			0	(11)	(21)
Income tax (expense) benefit			5	110	12
Discontinued operations, net of income taxes			(3)	(85)	(287)
Discontinued Operations, Held-for-sale or Disposed of by Sale | IT Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services			0	895	1,168
Cost of product sales and services			0	(777)	(1,002)
Engineering, selling and administrative expenses			0	(68)	(84)
Impairment of goodwill and other assets			0	(240)	0
Non-operating loss, net			(4)	(9)	0
Income (loss) before income taxes			(4)	(199)	82
Gain (loss) on sale of discontinued operations, before tax			0	(28)	0
Income tax (expense) benefit			5	69	(30)
Discontinued operations, net of income taxes			1	(158)	52
Discontinued Operations, Held-for-sale or Disposed of by Sale | Caprock
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services			0	144	361
Cost of product sales and services			0	(108)	(284)
Engineering, selling and administrative expenses			0	(23)	(66)
Impairment of goodwill and other assets			0	0	(367)
Non-operating loss, net			(4)	4	0
Income (loss) before income taxes			(4)	17	(356)
Gain (loss) on sale of discontinued operations, before tax			0	14	0
Income tax (expense) benefit			0	41	38
Discontinued operations, net of income taxes			$ (4)	72	(318)
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, net				(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 | Caprock
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
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]
Revenue from product sales and services					60
Income (loss) before income taxes					5
Gain (loss) on sale of discontinued operations, before tax					$ 10