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Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 29, 2017 | Dec. 30, 2016 | Dec. 29, 2017 | Dec. 30, 2016
Change in Accounting Estimate [Line Items] |  |  |  |
Operating income | $ 272 | $ 277 | $ 544 | $ 523
Contracts Accounted for under Percentage of Completion |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Operating income | (10) | 6 | $ 1 | 19
Operating income, net of tax | $ (7) | $ 4 |  | $ 12
Operating income per diluted share (in dollars per share) | $ (0.06) | $ 0.03 |  | $ 0.10

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