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Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 30, 2018 | Mar. 31, 2017 | Mar. 30, 2018 | Mar. 31, 2017
Change in Accounting Estimate [Line Items] |  |  |  |
Operating income | $ 256 | $ 275 | $ 800 | $ 798
Contracts Accounted for under Percentage of Completion |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Operating income | 5 | 11 | 6 | 30
Operating income, net of tax | $ 4 | $ 6 | $ 4 | $ 19
Operating income, per diluted share (in dollars per share) | $ 0.03 | $ 0.05 | $ 0.04 | $ 0.14

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