BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Sep. 30, 2022	Oct. 01, 2021
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 4,246	$ 4,229	$ 12,484	$ 13,464
Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,710	1,649	5,104	5,192
Integrated Mission Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,295	1,276	3,763	3,833
Integrated Mission Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	401	359	1,297	1,320
Integrated Mission Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,270	1,224	3,777	3,868
Integrated Mission Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	426	411	1,283	1,285
Integrated Mission Systems | Transferred over Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	14	14	44	39
Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,502	1,494	4,450	4,464
Space & Airborne Systems | Transferred over Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,332	1,326	3,922	3,916
Space & Airborne Systems | Transferred over Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	164	164	510	540
Space & Airborne Systems | Transferred over Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	914	907	2,675	2,762
Space & Airborne Systems | Transferred over Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	582	583	1,757	1,694
Space & Airborne Systems | Transferred over Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	6	4	18	8
Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,068	1,030	3,024	3,269
Communication Systems | Transferred at Point in Time | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	706	719	1,962	2,337
Communication Systems | Transferred at Point in Time | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	348	296	1,029	892
Communication Systems | Transferred at Point in Time | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	899	871	2,530	2,765
Communication Systems | Transferred at Point in Time | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	155	144	461	464
Communication Systems | Transferred at Point in Time | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	14	15	33	40
Prime contractor | Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,138	1,080	3,351	3,454
Prime contractor | Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	963	939	2,835	2,736
Prime contractor | Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	690	681	2,037	2,193
Subcontractor | Integrated Mission Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	558	555	1,709	1,699
Subcontractor | Space & Airborne Systems | Transferred over Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	533	551	1,597	1,720
Subcontractor | Communication Systems | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 364	$ 334	$ 954	$ 1,036