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BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Millions	6 Months Ended			12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017	Jan. 01, 2021	Jan. 03, 2020	Jun. 28, 2019	Jun. 29, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 9,263	$ 3,208		$ 18,194	$ 12,856	$ 6,801	$ 6,168
United States
Disaggregation of Revenue [Line Items]
Revenue	8,485			16,998		6,530	5,854
International
Disaggregation of Revenue [Line Items]
Revenue	778			1,196		271	314
Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue	2,758			5,538		52	55
Integrated Mission Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue	2,146			4,389		30	40
Integrated Mission Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue	612			1,149		22	15
Integrated Mission Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	2,121			4,179		52	54
Integrated Mission Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	637			1,359		0	1
Integrated Mission Systems | Transferred over Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	1,892			3,718		27	26
Integrated Mission Systems | Transferred over Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	866			1,820		25	29
Space and Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue	2,377			4,946		3,711	3,294
Space and Airborne Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue	2,043			4,195		3,255	2,936
Space and Airborne Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue	334			751		456	358
Space and Airborne Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	1,384			2,838		2,093	1,625
Space and Airborne Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	993			2,108		1,618	1,669
Space and Airborne Systems | Transferred over Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	1,348			2,684		2,244	2,152
Space and Airborne Systems | Transferred over Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	1,029			2,262		1,467	1,142
Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue	2,151			4,443		2,208	2,015
Communication Systems | Transferred at Point in Time | United States
Disaggregation of Revenue [Line Items]
Revenue	1,518			3,204		1,281	1,031
Communication Systems | Transferred at Point in Time | International
Disaggregation of Revenue [Line Items]
Revenue	633			1,239		927	984
Communication Systems | Transferred at Point in Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	1,849			3,805
Communication Systems | Transferred at Point in Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	302			638
Communication Systems | Transferred at Point in Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	1,406			3,102
Communication Systems | Transferred at Point in Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	745			1,341
Aviation Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue	2,038	$ 672	$ 668	3,448		672	668
Aviation Systems | Transferred at Point in Time | United States
Disaggregation of Revenue [Line Items]
Revenue	1,514			2,843		644	627
Aviation Systems | Transferred at Point in Time | International
Disaggregation of Revenue [Line Items]
Revenue	524			605		28	41
Aviation Systems | Transferred at Point in Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	1,688			2,809		587	582
Aviation Systems | Transferred at Point in Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	350			639		85	86
Aviation Systems | Transferred at Point in Time | Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	1,246			2,258		654	656
Aviation Systems | Transferred at Point in Time | Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	$ 792			$ 1,190		$ 18	$ 12

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