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Significant Accounting Policies and Recent Accounting Standards (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 29, 2017 | Dec. 30, 2016 | Dec. 29, 2017 | Dec. 30, 2016 | Jun. 29, 2018 | Jun. 30, 2017 | Sep. 29, 2017
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Operating income | $ 272 | $ 277 | $ 544 | $ 523 |  |  |
Exelis |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Charges for integration and other costs |  |  |  |  |  | $ 58 |
Adjustments for New Accounting Pronouncements |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Reduction in prepaid income taxes |  |  |  |  |  |  | $ 27
Increase in non-current deferred income taxes |  |  |  |  |  |  | $ 27
Adjustments for New Accounting Pronouncements | Pro Forma |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Operating income |  |  |  |  |  | 164 |
Adjustments for New Accounting Pronouncements | Scenario, Forecast |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Operating income |  |  |  |  | $ 183 |  |
Discontinued Operations |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |
Liabilities associated with integration and restructuring costs | $ 34 |  | $ 34 |  |  | $ 43 |

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