Changes in Estimate (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 29, 2017	Sep. 30, 2016
Change in Accounting Estimate [Line Items]
Operating income	$ 272	$ 246
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Operating income	11	13
Operating income, net of tax	$ 6	$ 8
Operating income per diluted share (in dollars per share)	$ 0.05	$ 0.06