Number of Potentially Responsible Parties Notified

No definition available.

Name:	hrs_NumberofPotentiallyResponsiblePartiesNotified
Namespace Prefix:	hrs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Best estimate of the loss exposure for reasonably possible environmental contingencies at an individual site for which no accrual has been recorded.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (c),(d)(2)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859

+ Details

Name:	us-gaap_SiteContingencyLossExposureNotAccruedBestEstimate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=hrs_ExelisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EnvironmentalRemediationSiteAxis=hrs_PassaicRiverAlaskaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hrs_L3HarrisTechnologiesInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=hrs_PutativeClassActionLawsuitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=hrs_L3PartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=hrs_Kentv.L3TechnologiesInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=hrs_IndividualLawsuitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Legal Proceedings and Contingencies (Details) $ in Millions			1 Months Ended	6 Months Ended
Legal Proceedings and Contingencies (Details) $ in Millions	Jan. 04, 2019 claim	Mar. 31, 2016 party	Jan. 15, 2019 claim	Dec. 28, 2018 USD ($)
Exelis \| Passaic River Alaska
Loss Contingencies [Line Items]
Number of potentially responsible parties notified (over 100) \| party		100
Estimated cost for all participating parties of EPA's preferred alternative \| $				$ 1,380
L3 Harris Technologies, Inc. \| Subsequent Event \| Pending Litigation
Loss Contingencies [Line Items]
Number of lawsuits filed			4
L3 Harris Technologies, Inc. \| Subsequent Event \| Pending Litigation \| Putative Class Action Lawsuit \| L3 Parties
Loss Contingencies [Line Items]
Number of lawsuits filed			2
L3 Harris Technologies, Inc. \| Subsequent Event \| Pending Litigation \| Putative Class Action Lawsuit \| Kent v. L3 Technologies, Inc.
Loss Contingencies [Line Items]
Number of lawsuits filed	1
L3 Harris Technologies, Inc. \| Subsequent Event \| Pending Litigation \| Individual Lawsuit \| L3 Parties
Loss Contingencies [Line Items]
Number of lawsuits filed			1