Discontinued Operations - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 29, 2017	Dec. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of income taxes	$ 0	$ 14	$ (6)	$ 29
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		336	0	687
Cost of product sales and services		(281)	0	(570)
Engineering, selling and administrative expenses		(34)	0	(72)
Impairment of goodwill and other assets		(2)	0	(2)
Non-operating income (loss)		7	(3)	7
Income (loss) before income taxes		26	(3)	50
Loss on sale of discontinued operations (1)		(5)	0	(7)
Income tax expense		(7)	(3)	(14)
Discontinued operations, net of income taxes		14	(6)	29
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		268	0	543
Cost of product sales and services		(228)	0	(462)
Engineering, selling and administrative expenses		(25)	0	(49)
Impairment of goodwill and other assets		(2)	0	(2)
Non-operating income (loss)		0	(2)	0
Income (loss) before income taxes		13	(2)	30
Loss on sale of discontinued operations (1)		(5)	0	(7)
Income tax expense		(4)	(3)	(10)
Discontinued operations, net of income taxes		4	(5)	13
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		68	0	144
Cost of product sales and services		(53)	0	(108)
Engineering, selling and administrative expenses		(9)	0	(23)
Non-operating income (loss)		8	(1)	8
Income (loss) before income taxes		14	(1)	21
Income tax expense		(3)	0	(4)
Discontinued operations, net of income taxes		$ 11	$ (1)	$ 17