BUSINESS SEGMENTS - Geographic Information (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Dec. 31, 2021	Jan. 01, 2021	Jan. 03, 2020	Jun. 28, 2019
Segment Reporting Information [Line Items]
Capital Expenditures	$ 173		$ 342	$ 368		$ 161
Depreciation and Amortization	442		967	1,032		258
Revenue	9,263	$ 3,208	17,814	18,194	$ 12,856	6,801
U.S. operations
Segment Reporting Information [Line Items]
Revenue	8,485		16,234	16,998		6,530
Long-lived assets	1,865		1,870	1,949	1,865	866
International operations
Segment Reporting Information [Line Items]
Revenue	778		1,580	1,196		271
Long-lived assets	252		231	153	$ 252	28
Operating segments | Integrated Mission Systems
Segment Reporting Information [Line Items]
Capital Expenditures	29		64	67		1
Depreciation and Amortization	37		74	70		2
Revenue	2,758		5,839	5,538		52
Operating segments | Space & Airborne Systems
Segment Reporting Information [Line Items]
Capital Expenditures	36		101	92		48
Depreciation and Amortization	31		69	66		50
Revenue	2,377		5,093	4,946		3,711
Operating segments | Communication Systems
Segment Reporting Information [Line Items]
Capital Expenditures	22		56	58		29
Depreciation and Amortization	32		49	61		49
Revenue	2,151		4,287	4,443		2,208
Operating segments | Aviation Systems
Segment Reporting Information [Line Items]
Capital Expenditures	64		63	87		54
Depreciation and Amortization	53		66	103		29
Revenue	2,038		2,783	3,448		672
Operating segments | Other non-reportable business segments
Segment Reporting Information [Line Items]
Capital Expenditures	0		0	0		6
Depreciation and Amortization	0		0	0		3
Corporate eliminations
Segment Reporting Information [Line Items]
Capital Expenditures	22		58	64		23
Depreciation and Amortization	289		709	732		125
Revenue	$ (84)		$ (188)	$ (181)		$ (7)