RESTRUCTURING AND OTHER EXIT COSTS - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 03, 2020 USD ($)	Jan. 03, 2020 USD ($)	Jun. 29, 2018 USD ($)	Jun. 30, 2017 USD ($)	Oct. 01, 2020 floor	Dec. 03, 2019 floor	Jun. 28, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 117	$ 51
Restructuring reserve	$ 65	65	45	$ 43			$ 16
Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve			27				16
Workforce reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges		117	1
Restructuring reserve	58	58	2	12			0
Lease Termination
Restructuring Cost and Reserve [Line Items]
Number of leased floors | floor						6
Loss on termination of lease	2
Impairment charge for ROU asset	46
Facilities closing and contract termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0	50
Restructuring reserve	$ 7	$ 7	43	31			$ 16
Remaining lease term (less than)		4 years
Engineering, selling and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring reserve			18
Engineering, selling and administrative expenses | Exelis
Restructuring Cost and Reserve [Line Items]
Restructuring charges			5	$ 58
Engineering, selling and administrative expenses | Facilities closing and contract termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 45
Forecast | Lease Termination
Restructuring Cost and Reserve [Line Items]
Number of leased floors | floor					5