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BUSINESS COMBINATIONS - Pro Forma Results (Unaudited) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jul. 03, 2015
Business Acquisition [Line Items]      
Revenue from product sales and services — as reported $ 5,900 $ 5,992 $ 3,885
Exelis | As Reported      
Business Acquisition [Line Items]      
Revenue from product sales and services — as reported     3,885
Income from continuing operations — as reported     287
Exelis | Pro Forma      
Business Acquisition [Line Items]      
Revenue from product sales and services — pro forma     6,285
Income from continuing operations — pro forma     $ 384