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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