SUBSEQUENT EVENTS - Pending Divestitures (Details) $ in Millions	2 Months Ended	6 Months Ended		12 Months Ended
	Mar. 01, 2021 USD ($) business	Jan. 03, 2020 USD ($)	Dec. 28, 2018 USD ($)	Jan. 01, 2021 USD ($)	Jan. 03, 2020 USD ($)	Jun. 28, 2019 USD ($)	Jun. 29, 2018 USD ($)	Feb. 27, 2021 USD ($)
Business Acquisition [Line Items]
Revenue		$ 9,263	$ 3,208	$ 18,194	$ 12,856	$ 6,801	$ 6,168
Disposal Group, Not Discontinued Operations | Military Training Business | Aviation Systems
Business Acquisition [Line Items]
Revenue				500
Disposal Group, Not Discontinued Operations | CPS | Aviation Systems
Business Acquisition [Line Items]
Revenue				$ 230
Subsequent Event | Disposal Group, Not Discontinued Operations
Business Acquisition [Line Items]
Number of business divested | business	2
Subsequent Event | Disposal Group, Not Discontinued Operations | Military Training Business | Aviation Systems
Business Acquisition [Line Items]
Cash price on sale of business								$ 1,050
Subsequent Event | Disposal Group, Not Discontinued Operations | CPS | Aviation Systems
Business Acquisition [Line Items]
Cash price on sale of business	$ 400