RESEARCH AND DEVELOPMENT (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jan. 03, 2020	Dec. 31, 2021	Jan. 01, 2021	Jun. 28, 2019
Research and Development [Abstract]
R&D costs	$ 329	$ 692	$ 684	$ 331

Research and development expense excluding acquired in process cost and including software.

No definition available.

Name:	hrs_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCostAndIncludingSoftware
Namespace Prefix:	hrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration