GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Apr. 03, 2026 USD ($) business reporting_unit segment	Mar. 28, 2025 USD ($)	Jan. 02, 2026 USD ($) segment reporting_unit
Finite-Lived Intangible Assets [Line Items]
Number of reportable segments | segment	3		4
Amortization expense	$ 174	$ 194
Number of reporting units | reporting_unit	5		7
Number of reporting units reassigned | reporting_unit	3
Space And Airborne Systems Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Number of businesses combined | business	2
Targeting And Sensor Systems And Defense Electronics Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Number of businesses combined | business	2
Broadband Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Number of businesses combined | business	2
SMS
Finite-Lived Intangible Assets [Line Items]
Accumulated goodwill impairment loss	$ 120		$ 120
CSD
Finite-Lived Intangible Assets [Line Items]
Accumulated goodwill impairment loss	431		431
MSL
Finite-Lived Intangible Assets [Line Items]
Accumulated goodwill impairment loss	$ 337		$ 337