BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 4,103	$ 4,567
Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,721	1,751
Integrated Mission Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,244	1,275
Integrated Mission Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	461	464
Integrated Mission Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,277	1,294
Integrated Mission Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	428	445
Integrated Mission Systems | Transferred over Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	16	12
Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,450	1,460
Space & Airborne Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,279	1,274
Space & Airborne Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	165	183
Space & Airborne Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	863	914
Space & Airborne Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	581	543
Space & Airborne Systems | Transferred over Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	6	3
Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	963	1,112
Communication Systems | Transferred at Point in Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	625	832
Communication Systems | Transferred at Point in Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	327	269
Communication Systems | Transferred at Point in Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	797	940
Communication Systems | Transferred at Point in Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	155	161
Communication Systems | Transferred at Point in Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	11	11
Prime contractor | Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,131	1,189
Prime contractor | Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	931	876
Prime contractor | Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	656	728
Subcontractor | Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	574	550
Subcontractor | Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	513	581
Subcontractor | Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 296	$ 373