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RESEARCH AND DEVELOPMENT (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 03, 2020 | Jan. 01, 2021 | Jun. 28, 2019 | Jun. 29, 2018
Research and Development [Abstract] |  |  |  |
R&D costs | $ 329 | $ 684 | $ 331 | $ 311

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

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