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CONTRACT ASSETS AND CONTRACT LIABILITIES - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Jan. 03, 2020 | Jan. 01, 2021 | Jun. 28, 2019 | Jun. 29, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |
U.S. Government's progress payment rate | 8000.00% | 9000.00% |  |
Recognized revenue related to contract liabilities outstanding at the end of the year | $ 776 | $ 961 | $ 287 | $ 204

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- Definition Government Contract Receivable, Progress Payment Rate + References No definition available. + Details
Name: | hrs_GovernmentContractReceivableProgressPaymentRate
Namespace Prefix: | hrs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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