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BUSINESS COMBINIATION - Pro Forma Results (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jan. 03, 2020
Dec. 28, 2018
Jun. 28, 2019
Jun. 29, 2018
Jun. 30, 2017
Business Acquisition [Line Items]          
Revenue from product sales and services — as reported $ 9,263 $ 3,208 $ 6,801 $ 6,168 $ 5,897
Income from continuing operations — as reported $ 835 441 $ 953 $ 702 $ 628
L3Harris          
Business Acquisition [Line Items]          
Revenue from product sales and services — as reported   3,208      
Revenue from product sales and services — pro forma   8,404      
Income from continuing operations — as reported   441      
Income from continuing operations — pro forma   $ 760