BUSINESS COMBINATION - Pro Forma Results (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Jan. 01, 2021	Jan. 03, 2020	Jun. 28, 2019	Jun. 29, 2018
Business Acquisition [Line Items]
Revenue from product sales and services — as reported	$ 9,263	$ 3,208	$ 18,194	$ 12,856	$ 6,801	$ 6,168
Income from continuing operations — as reported	$ 835	441	1,088	$ 1,347	$ 953	$ 702
L3Harris
Business Acquisition [Line Items]
Revenue from product sales and services — as reported		3,208	12,856
Revenue from product sales and services — pro forma		8,404	18,097
Income from continuing operations — as reported		441	1,347
Income from continuing operations — pro forma		$ 760	$ 1,652