Debt Exchange Offer, Conversion Ratio, Debt To Be Exchanged For Cash

No definition available.

Name:	hrs_DebtExchangeOfferConversionRatioDebtToBeExchangedForCash
Namespace Prefix:	hrs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Days In Registered Exchange Offer Period

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Days In Registered Exchange Offer Period Following Date of Default

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Special Additional Interest Increase Per Year Rate Percentage

+ References

No definition available.

+ Details

Name:	hrs_DebtInstrumentSpecialAdditionalInterestIncreasePerYearRatePercentage
Namespace Prefix:	hrs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

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 http://asc.fasb.org/extlink&oid=98513485&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 http://asc.fasb.org/extlink&oid=98513485&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:	num: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

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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 http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: 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 http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: 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 http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: 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 http://asc.fasb.org/extlink&oid=6877327&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_BusinessAcquisitionAxis=hrs_L3HarrisTechnologiesInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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_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:

Debt - Debt Exchange (Details) $ in Millions	Jul. 02, 2019 USD ($) day	Jul. 01, 2019 USD ($)	Sep. 27, 2019 USD ($)	Jun. 29, 2019 USD ($)	Jun. 28, 2019 USD ($)
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of Remaining L3 Notes			$ 6,963		$ 3,419
Senior Unsecured Debt
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of Remaining L3 Notes				$ 3,520
Senior Unsecured Debt \| L3Harris
Debt Instrument, Redemption [Line Items]
Debt exchange to cash conversion ratio	1,000
Aggregate Principal Amount of L3 Notes (prior to debt exchange)	$ 3,350
Aggregate Principal Amount of New L3Harris Notes Issued	$ 3,021
Days in registered exchange offer period \| day	365
Debt special additional interest rate percentage per year	0.25%
Days in registered exchange offer period following date of default \| day	90
Senior Unsecured Debt \| L3Harris \| Minimum
Debt Instrument, Redemption [Line Items]
Debt special additional interest rate percentage per year	0.25%
Senior Unsecured Debt \| L3Harris \| Maximum
Debt Instrument, Redemption [Line Items]
Debt special additional interest rate percentage per year	0.50%
Senior Unsecured Debt \| L3
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)		$ 3,350
Aggregate Principal Amount of Remaining L3 Notes	$ 329
Senior Unsecured Debt \| L3 \| L3Harris
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of Remaining L3 Notes	$ 329
Senior Unsecured Debt \| 4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) \| L3Harris
Debt Instrument, Redemption [Line Items]
Debt exchange converted interest rate	4.95%
Aggregate Principal Amount of New L3Harris Notes Issued	$ 501
Debt interest rate	4.95%
Interest rate margin	0.25%
Senior Unsecured Debt \| 4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) \| L3
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)		650
Aggregate Principal Amount of Remaining L3 Notes	$ 149
Senior Unsecured Debt \| 3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) \| L3Harris
Debt Instrument, Redemption [Line Items]
Debt exchange converted interest rate	3.85%
Aggregate Principal Amount of New L3Harris Notes Issued	$ 741
Debt interest rate	3.85%
Debt instrument redemption price percentage	1.00%
Interest rate margin	0.20%
Senior Unsecured Debt \| 3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) \| L3
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)		800
Aggregate Principal Amount of Remaining L3 Notes	$ 59
Senior Unsecured Debt \| 3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) \| L3Harris
Debt Instrument, Redemption [Line Items]
Debt exchange converted interest rate	3.95%
Aggregate Principal Amount of New L3Harris Notes Issued	$ 326
Debt interest rate	3.95%
Senior Unsecured Debt \| 3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) \| L3
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)		350
Aggregate Principal Amount of Remaining L3 Notes	$ 24
Senior Unsecured Debt \| 3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) \| L3Harris
Debt Instrument, Redemption [Line Items]
Debt exchange converted interest rate	3.85%
Aggregate Principal Amount of New L3Harris Notes Issued	$ 535
Debt interest rate	3.85%
Senior Unsecured Debt \| 3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) \| L3
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)		550
Aggregate Principal Amount of Remaining L3 Notes	$ 15
Senior Unsecured Debt \| 4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) \| L3Harris
Debt Instrument, Redemption [Line Items]
Debt exchange converted interest rate	4.40%
Aggregate Principal Amount of New L3Harris Notes Issued	$ 918
Debt interest rate	4.40%
Senior Unsecured Debt \| 4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) \| L3
Debt Instrument, Redemption [Line Items]
Aggregate Principal Amount of L3 Notes (prior to debt exchange)		$ 1,000
Aggregate Principal Amount of Remaining L3 Notes	$ 82