The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126999549&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

+ References

+ Details

Name:	us-gaap_DebtConversionConvertedInstrumentRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

+ Details

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_A4.950SeniorNotesdueFebruary152021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_A3.850SeniorNotesdueJune152023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_A3.950SeniorNotesdueMay282024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_A3.850SeniorNotesdueDecember152026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_A4.400SeniorNotesdueJune152028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=hrs_L3TechnologiesInc.Member
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:

DEBT - Schedule of Debt Exchanged (Details) - Senior Unsecured Debt - USD ($) $ in Millions	May 05, 2020	Jul. 02, 2019	Jul. 01, 2019
4.950% Senior Notes due February 15, 2021
Debt Instrument [Line Items]
Debt exchange, converted interest rate	4.95%
3.850% Senior Notes due June 15, 2023
Debt Instrument [Line Items]
Debt exchange, converted interest rate	3.85%
3.950% Senior Notes due May 28 2024
Debt Instrument [Line Items]
Debt exchange, converted interest rate	3.95%
3.850% Senior Notes due December 15, 2026
Debt Instrument [Line Items]
Debt exchange, converted interest rate	3.85%
4.400% Senior Notes due June 15, 2028
Debt Instrument [Line Items]
Debt exchange, converted interest rate	4.40%
L3
Debt Instrument [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)			$ 3,350
Long-term debt		$ 329
L3 \| 4.950% Senior Notes due February 15, 2021
Debt Instrument [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)			650
Long-term debt		149
L3 \| 3.850% Senior Notes due June 15, 2023
Debt Instrument [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)			800
Long-term debt		59
L3 \| 3.950% Senior Notes due May 28 2024
Debt Instrument [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)			350
Long-term debt		24
L3 \| 3.850% Senior Notes due December 15, 2026
Debt Instrument [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)			550
Long-term debt		15
L3 \| 4.400% Senior Notes due June 15, 2028
Debt Instrument [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)			$ 1,000
Long-term debt		82
L3Harris
Debt Instrument [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)		3,350
Aggregate Principal Amount of New L3Harris Notes Issued		$ 3,021
L3Harris \| 4.950% Senior Notes due February 15, 2021
Debt Instrument [Line Items]
Debt exchange, converted interest rate		4.95%	4.95%
Aggregate Principal Amount of New L3Harris Notes Issued		$ 501
L3Harris \| 3.850% Senior Notes due June 15, 2023
Debt Instrument [Line Items]
Debt exchange, converted interest rate		3.85%	3.85%
Aggregate Principal Amount of New L3Harris Notes Issued		$ 741
L3Harris \| 3.950% Senior Notes due May 28 2024
Debt Instrument [Line Items]
Debt exchange, converted interest rate		3.95%	3.95%
Aggregate Principal Amount of New L3Harris Notes Issued		$ 326
L3Harris \| 3.850% Senior Notes due December 15, 2026
Debt Instrument [Line Items]
Debt exchange, converted interest rate		3.85%	3.85%
Aggregate Principal Amount of New L3Harris Notes Issued		$ 535
L3Harris \| 4.400% Senior Notes due June 15, 2028
Debt Instrument [Line Items]
Debt exchange, converted interest rate		4.40%	4.40%
Aggregate Principal Amount of New L3Harris Notes Issued		$ 918
L3Harris \| L3
Debt Instrument [Line Items]
Long-term debt		$ 329