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Discontinued Operations - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	Apr. 28, 2017	Jan. 01, 2017	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]
Income from sale of discontinued operations per diluted share (in dollars per share)			$ 0.00	$ 0.10	$ (0.05)	$ 0.23
IT Services | Critical Networks | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net	$ 646
Pre-tax gain (loss) on sale of discontinued operations, before tax	(28)
Gain on sale of discontinued operations, net of tax	$ 55
Income from sale of discontinued operations per diluted share (in dollars per share)	$ 0.44
Discontinued operations, period of continuing involvement after disposal	18 months
CapRock | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net		$ 368
Pre-tax gain (loss) on sale of discontinued operations, before tax		14
Gain on sale of discontinued operations, net of tax		$ 61
Income from sale of discontinued operations per diluted share (in dollars per share)		$ 0.49

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Period of expected continuing involvement with a discontinued operation after the disposal date, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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