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BUSINESS SEGMENTS - Disaggregation of Revenue (Details) $ in Millions	12 Months Ended
	Dec. 29, 2023 USD ($) segment	Dec. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment	4
Number of reportable segments \| segment	4
Disaggregation of Revenue [Line Items]
Revenue	$ 19,419	$ 17,062	$ 17,814
United States
Disaggregation of Revenue [Line Items]
Revenue	17,537	15,373	16,234
International
Disaggregation of Revenue [Line Items]
Revenue	1,882	1,689	1,580
SAS \| United States
Disaggregation of Revenue [Line Items]
Revenue	5,933	5,623	5,569
SAS \| International
Disaggregation of Revenue [Line Items]
Revenue	874	712	704
SAS \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	4,257	3,811	3,781
SAS \| Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	2,550	2,524	2,492
SAS \| Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	4,252	4,005	3,942
SAS \| Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	2,555	2,330	2,331
SAS \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue	49	49	42
SAS \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue	6,856	6,384	6,315
IMS \| United States
Disaggregation of Revenue [Line Items]
Revenue	4,816	4,796	4,782
IMS \| International
Disaggregation of Revenue [Line Items]
Revenue	1,727	1,759	1,879
IMS \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	5,020	5,060	5,231
IMS \| Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	1,523	1,495	1,430
IMS \| Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	4,196	4,301	4,474
IMS \| Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	2,347	2,254	2,187
IMS \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue	87	71	72
IMS \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue	6,630	6,626	6,733
CS \| United States
Disaggregation of Revenue [Line Items]
Revenue	3,482	2,735	3,001
CS \| International
Disaggregation of Revenue [Line Items]
Revenue	1,535	1,437	1,232
CS \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	4,289	3,552	3,631
CS \| Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	728	620	602
CS \| Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	3,420	2,829	2,886
CS \| Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	1,597	1,343	1,347
CS \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue	53	45	54
CS \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue	5,070	4,217	4,287
AR \| United States
Disaggregation of Revenue [Line Items]
Revenue	1,015
AR \| International
Disaggregation of Revenue [Line Items]
Revenue	37
AR \| Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	632
AR \| Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue	420
AR \| Prime contractor
Disaggregation of Revenue [Line Items]
Revenue	250
AR \| Subcontractor
Disaggregation of Revenue [Line Items]
Revenue	802
AR \| Intersegment
Disaggregation of Revenue [Line Items]
Revenue	0
AR \| Operating segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1,052	$ 0	$ 0