BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 4,135	$ 4,668	$ 8,238	$ 9,235
Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,673	1,792	3,394	3,543
Integrated Mission Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,223	1,282	2,468	2,557
Integrated Mission Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	436	497	897	961
Integrated Mission Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,230	1,350	2,507	2,644
Integrated Mission Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	429	429	858	874
Integrated Mission Systems | Transferred over Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	14	13	29	25
Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,498	1,510	2,948	2,970
Space & Airborne Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,311	1,315	2,590	2,589
Space & Airborne Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	181	193	346	376
Space & Airborne Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	898	941	1,762	1,855
Space & Airborne Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	594	567	1,174	1,110
Space & Airborne Systems | Transferred over Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	6	2	12	5
Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	993	1,127	1,956	2,239
Communication Systems | Transferred at Point in Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	631	786	1,256	1,618
Communication Systems | Transferred at Point in Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	353	327	681	596
Communication Systems | Transferred at Point in Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	833	954	1,631	1,894
Communication Systems | Transferred at Point in Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	151	159	306	320
Communication Systems | Transferred at Point in Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	9	14	19	25
Prime contractor | Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,082	1,185	2,214	2,374
Prime contractor | Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	942	921	1,872	1,797
Prime contractor | Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	690	783	1,347	1,512
Subcontractor | Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	577	594	1,151	1,144
Subcontractor | Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	550	587	1,064	1,168
Subcontractor | Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 294	$ 330	$ 590	$ 702