Discontinued Operations - Depreciation, Amortization, Capital Expenditures, and Significant Operating and Investing Noncash Items (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jan. 01, 2017	Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2017	Apr. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization		$ 11	$ 19	$ 47	$ 67
Capital expenditures		0	11	5	16
Impairment of goodwill and other assets		238	0	240	367
Adjustment to loss on sales of businesses, net		5	0	(2)	(21)
Critical Networks | CapRock | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Adjustment to loss on sales of businesses, net	$ 23	$ 23	$ 0	$ 23	$ 0