Discontinued Operations - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 30, 2016	Jan. 01, 2016	Dec. 30, 2016	Jan. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Adjustment to loss on sales of businesses, net			$ 0	$ (21)
Discontinued operations, net of income taxes	$ 9	$ (349)	13	(347)
CapRock | Critical Networks | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from product sales and services	69	95	145	196
Cost of product sales and services	(53)	(77)	(109)	(154)
Engineering, selling and administrative expenses	(11)	(22)	(26)	(43)
Impairment of goodwill and other assets	0	(367)	0	(367)
Non-operating income	7	0	7	0
Income (loss) before income taxes	12	(371)	17	(368)
Adjustment to loss on sales of businesses, net	0	(21)	0	(21)
Income tax (expense) benefit	(3)	43	(4)	42
Discontinued operations, net of income taxes	$ 9	$ (349)	$ 13	$ (347)