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RESEARCH AND DEVELOPMENT (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 03, 2020 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 30, 2017
Research and Development [Abstract] |  |  |  |
R&D costs | $ 329 | $ 331 | $ 311 | $ 310

X
- Definition Research and development expense excluding acquired in process cost and including software. + References No definition available. + Details
Name: | hrs_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCostAndIncludingSoftware
Namespace Prefix: | hrs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ResearchAndDevelopmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration