Amount of certain ERISA liability incurrence that is considered an event of default.

No definition available.

Name:	hrs_AmountOfCertainErisaLiabilityIncurrenceConsideredEventOfDefault
Namespace Prefix:	hrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of unsatisfied final judgments or orders that is considered an event of default.

+ References

No definition available.

+ Details

Name:	hrs_AmountOfUnsatisfiedFinalJudgmentsOrOrdersConsideredEventOfDefault
Namespace Prefix:	hrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Current interest rate margin over the base rate.

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument, Periodic Payment, Principal, Percent

+ References

No definition available.

+ Details

Name:	hrs_DebtInstrumentPeriodicPaymentPrincipalPercent
Namespace Prefix:	hrs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

LIBOR divisor

+ References

No definition available.

+ Details

Name:	hrs_LiborDivisor
Namespace Prefix:	hrs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum Allowable Percentage Of Consolidated Indebtedness To Capital.

+ References

No definition available.

+ Details

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

- Definition

Payment failures on other debt which can trigger an event of default.

+ References

No definition available.

+ Details

Name:	hrs_Principalamountofotherindebtednesswhichcouldtriggereventofdefault
Namespace Prefix:	hrs_
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

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_VariableRateTermLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=hrs_FinancialGuaranteeExelisIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_NotePayableThirteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrs_NotePayableFourteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LONG-TERM DEBT - Variable Rate Term Loans (Details)	Jul. 01, 2015 USD ($)	May 29, 2015 USD ($)	Jun. 30, 2017 USD ($)	Jul. 01, 2016 USD ($)	May 29, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt, gross			$ 3,945,000,000	$ 4,494,000,000
LIBOR divisor	1.00
Current interest rate margin over federal funds rate	0.50%
Maximum allowable percentage of consolidated total indebtedness to total capital	65.00%	65.00%
Principal amount of other indebtedness which could trigger event of default	$ 100,000,000
Amount of unsatisfied final judgment or orders considered an event of default	100,000,000
Amount of certain ERISA liability incurrence considered an event of default	$ 100,000,000
Eurodollar
Debt Instrument [Line Items]
Interest rate margin	1.00%
Variable Rate Term Loan Agreement
Debt Instrument [Line Items]
Current interest rate margin over federal funds rate		0.50%
Principal amount of other indebtedness which could trigger event of default		$ 100,000,000
Amount of unsatisfied final judgment or orders considered an event of default		100,000,000
Amount of certain ERISA liability incurrence considered an event of default		100,000,000
Debt issuance costs					$ 6,000,000
Variable Rate Term Loan Agreement \| Financial guarantee by Exelis Inc.
Debt Instrument [Line Items]
Notes payable		$ 100,000,000
Variable Rate Term Loan Agreement \| Eurodollar
Debt Instrument [Line Items]
LIBOR divisor		1.00
Interest rate margin		100.00%
Variable Rate Term Loan Agreement \| Eurodollar \| Minimum
Debt Instrument [Line Items]
Interest rate margin		1.125%
Variable Rate Term Loan Agreement \| Eurodollar \| Maximum
Debt Instrument [Line Items]
Interest rate margin		2.00%
Variable Rate Term Loan Agreement \| Base Rate \| Minimum
Debt Instrument [Line Items]
Interest rate margin		0.125%
Variable Rate Term Loan Agreement \| Base Rate \| Maximum
Debt Instrument [Line Items]
Interest rate margin		1.00%
Variable Rate Term Loan Agreement \| Exelis
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,300,000,000
3-year tranche, due May 29, 2018
Debt Instrument [Line Items]
Long-term debt, gross		$ 650,000,000
Debt instrument term		3 years
Quarterly principal amortization payments over initial principal amount (as percent)		2.50%
5-year tranche, due May 29, 2020
Debt Instrument [Line Items]
Long-term debt, gross		$ 650,000,000
Debt instrument term		5 years
Quarterly principal amortization payments over initial principal amount (as percent)		2.50%