Discontinued Operations - Income Statement (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jan. 01, 2017	Mar. 30, 2018	Mar. 31, 2017	Mar. 30, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of income taxes		$ (2)	$ (79)	$ (8)	$ (50)
Discontinued Operations, Disposed of by Sale | Broadcast Communications
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reduction to loss on sale of discontinued operations			3		3
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	$ 14
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	276	0	963
Cost of product sales and services		0	(236)	0	(806)
Engineering, selling and administrative expenses		0	(23)	0	(95)
Impairment of goodwill and other assets		0	(238)	0	(240)
Non-operating income (loss)		(2)	(4)	(5)	3
Loss before income taxes		(2)	(225)	(5)	(175)
Gain (loss) on sale of discontinued operations		0	5	0	(2)
Income tax benefit (expense)		0	141	(3)	127
Discontinued operations, net of income taxes		(2)	(79)	(8)	(50)
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	276	0	819
Cost of product sales and services		0	(236)	0	(698)
Engineering, selling and administrative expenses		0	(23)	0	(72)
Impairment of goodwill and other assets		0	(238)	0	(240)
Non-operating income (loss)		(1)	(4)	(3)	(4)
Loss before income taxes		(1)	(225)	(3)	(195)
Gain (loss) on sale of discontinued operations		0	(21)	0	(28)
Income tax benefit (expense)		0	94	(3)	84
Discontinued operations, net of income taxes		(1)	(152)	(6)	(139)
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	0	0	144
Cost of product sales and services		0	0	0	(108)
Engineering, selling and administrative expenses		0	0	0	(23)
Non-operating income (loss)		(1)	0	(2)	8
Loss before income taxes		(1)	0	(2)	21
Gain (loss) on sale of discontinued operations		0	23	0	23
Income tax benefit (expense)		0	47	0	43
Discontinued operations, net of income taxes		$ (1)	$ 70	$ (2)	$ 87