Research and Development (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 27, 2019	Sep. 28, 2018
Research and Development [Abstract]
Company-sponsored research and development costs	$ 149	$ 72

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