BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 4,693	$ 4,135	$ 9,164	$ 8,238
IMS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,735	1,608	3,435	3,267
IMS | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,281	1,154	2,538	2,336
IMS | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	430	435	852	896
IMS | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,317	1,209	2,603	2,470
IMS | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	394	380	787	762
IMS | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	24	19	45	35
SAS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,715	1,572	3,370	3,089
SAS | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,475	1,380	2,929	2,722
SAS | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	230	181	418	346
SAS | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,099	918	2,121	1,798
SAS | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	606	643	1,226	1,270
SAS | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	10	11	23	21
CS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,289	993	2,452	1,956
CS | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	834	631	1,625	1,256
CS | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	443	354	802	681
CS | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,102	834	2,080	1,631
CS | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	175	151	347	306
CS | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	12	8	25	19
Prime contractor | IMS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,127	1,035	2,281	2,121
Prime contractor | SAS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,084	987	2,094	1,964
Prime contractor | CS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	798	691	1,605	1,347
Subcontractor | IMS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	584	554	1,109	1,111
Subcontractor | SAS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	621	574	1,253	1,104
Subcontractor | CS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 479	$ 294	$ 822	$ 590