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BUSINESS SEGMENTS - Narrative (Details) $ in Millions	12 Months Ended
BUSINESS SEGMENTS - Narrative (Details) $ in Millions	Jan. 03, 2025 USD ($) segment	Dec. 29, 2023 USD ($)	Dec. 30, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment	4
Number of reportable segments \| segment	4
LHX NeXt initiative, term	2 years
Revenue	$ 21,325	$ 19,419	$ 17,062
Amortization of intangible assets, debt premium, debt discount and debt issuance costs	860	777	596
International
Segment Reporting Information [Line Items]
Revenue	1,711	1,882	1,689
SAS \| International
Segment Reporting Information [Line Items]
Revenue	847	874	712
IMS \| International
Segment Reporting Information [Line Items]
Revenue	1,844	1,727	1,759
CS \| International
Segment Reporting Information [Line Items]
Revenue	1,649	1,535	$ 1,437
AR \| International
Segment Reporting Information [Line Items]
Revenue	$ 48	$ 37
Revenue from Contract with Customer Benchmark \| Government Contracts Concentration Risk \| U.S. Government
Segment Reporting Information [Line Items]
Concentration risk percentage	76.00%	76.00%	74.00%
Revenue from Contract with Customer, Segment Benchmark \| Product Concentration Risk \| SAS
Segment Reporting Information [Line Items]
Concentration risk percentage	30.00%
Revenue from Contract with Customer, Segment Benchmark \| Product Concentration Risk \| IMS
Segment Reporting Information [Line Items]
Concentration risk percentage	37.00%
Revenue from Contract with Customer, Segment Benchmark \| Product Concentration Risk \| CS
Segment Reporting Information [Line Items]
Concentration risk percentage	16.00%
Revenue from Contract with Customer, Segment Benchmark \| Product Concentration Risk \| AR
Segment Reporting Information [Line Items]
Concentration risk percentage	33.00%
Revenue from Contract with Customer, Product and Service Benchmark \| Geographic Concentration Risk \| International
Segment Reporting Information [Line Items]
Concentration risk percentage	21.00%	21.00%	23.00%
Revenue	$ 4,388	$ 4,173	$ 3,908