INTANGIBLE ASSETS, NET - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 29, 2019	Jul. 02, 2021	Jan. 01, 2021	Jan. 03, 2020	Dec. 31, 2021	Jan. 01, 2021	Jun. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0				$ 62,000,000	$ 480,000,000
Amortization of Intangible Assets				$ 290,000,000	627,000,000	729,000,000
Exelis
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets							$ 115,000,000
Aviation Systems
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment					62,000,000	475,000,000
CTS
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment		$ 0
Impairment of long-lived assets					56,000,000
Impairment of intangible assets					7,000,000
CTS | Aviation Systems
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived assets					145,000,000
Impairment of intangible assets					$ 63,000,000
Commercial Aviation Solutions
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived assets						$ 257,000,000
Impairment of intangible assets			$ 113,000,000