RESEARCH AND DEVELOPMENT (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Research and Development [Abstract]
Company-sponsored research and development costs	$ 331	$ 311	$ 310

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