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Significant Accounting Policies and Recent Accounting Standards - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Jun. 29, 2018 | Jun. 30, 2017 | Jul. 02, 2016
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Revenue recognized from performance obligations satisfied in prior periods | $ 7 | $ 14 |  |  |
Contract costs payment period | 1 year |  |  |  |
Revenue performance obligation contract period | greater than one year |  |  |  |
Increase in costs and services sold | $ 1,010 | 919 |  |  |
Increase in engineering, selling and administrative expenses | 279 | 268 |  |  |
Increase in non-operating income | 47 | 46 |  |  |
Effect of Adopting ASU 2014-09 |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Operating income (loss) |  |  | $ (19) | $ (10) |
Operating income (loss), per diluted share (in dollars per share) |  |  | $ (0.15) | $ (0.08) |
Decrease in revenue from product sales and services |  |  | $ 14 | $ 3 |
Effect of Adopting ASU 2017-07 |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Increase in costs and services sold |  | 37 |  |  |
Increase in engineering, selling and administrative expenses |  | 9 |  |  |
Increase in non-operating income |  | 46 |  |  |
Retained Earnings | Effect of Adopting ASU 2014-09 |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Cumulative effect adjustment as reduction of opening balance of retained earnings |  |  |  |  | $ 15
Contracts Accounted for under Percentage of Completion |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Operating income (loss) | (3) | 5 |  |  |
Operating income (loss), after-tax | $ (2) | $ 3 |  |  |
Operating income (loss), per diluted share (in dollars per share) | $ (0.02) | $ 0.02 |  |  |

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