SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
Mar. 28, 2025	Mar. 29, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 19	$ 26
L3Harris Shareholder-approved Employee Stock Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock issued, net of shares withheld for tax purposes (in shares)	0.2	0.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details