| **Credit Arrangements (Details)**                                                |         |         | 12 Months Ended   |                 |
|----------------------------------------------------------------------------------|---------|---------|-------------------|-----------------|
||
| **Credit Arrangements (Textuals)**                                               |    |    |              |            |
| Value of senior unsecured revolving credit arrangement                           |    |    | $ 1,000,000,000   | $ 1,000,000,000 |
| Term of senior unsecured revolving credit agreement                              | 5 years |    |              |            |
| Sub-limit for swingline loans                                                    |    |    | 70,000,000        |            |
| Sub limit for letters of credit                                                  |    |    | 175,000,000       |            |
| Borrowings in non-U.S. currency sub limit under 2012 credit agreement            |    |    | 200,000,000       |            |
| Provision for maximum amount of commitments increase under 2012 credit agreement |    |    | 500,000,000       |            |
| Maximum amount of credit extensions available under 2012 credit agreement        |    |    | $ 1,500,000,000.0 |            |
| LIBOR divisor                                                                    |    |    | 1.00              |            |
| Initial interest rate margin over LIBOR                                          |    |    | 1.50%             |            |
| Maximum alternate interest rate margin over LIBOR                                |    |    | 2.00%             |            |
| Minimum alternate interest rate margin over LIBOR                                |    |    | 1.125%            |            |
| Current interest rate margin over the base rate                                  |    |    | 0.50%             |            |
| Maximum alternate interest rate margin over the base rate                        |    |    | 1.00%             |            |
| Minimum alternate interest rate margin over the base rate                        |    |    | 0.125%            |            |
| Commitment fee interest rate, initial                                            |    |    | 0.20%             |            |
| Commitment fee interest rate, maximum                                            |    |    | 0.30%             |            |
| Commitment fee interest rate, minimum                                            |    |    | 0.125%            |            |
| Maximum allowable percentage of consolidated total indebtedness to total capital |    |    | 65.00%            |            |
| Payment failures on other debt which can trigger an 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       |            |
| Borrowings under Guaranteed Investment Agreements                                |    |    | 0                 |            |
| Short term borrowings under commercial paper                                     |    |    | $ 0               |            |
| Eurodollar                                                                       |    |    |              |            |
| **Credit Arrangements (Textuals)**                                               |    |    |              |            |
| Debt Instrument, Basis Spread on Variable Rate                                   |    | 100.00% |              |            |

| X                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of certain ERISA liability incurrence that is considered an event of default.
+ References
No definition available.
+ Details**Name:**hrs_AmountOfCertainErisaLiabilityIncurrenceConsideredEventOfDefault**Namespace Prefix:**hrs_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 |
| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Borrowings in non-U.S.currency sub limit under 2012 Credit Agreement
+ References
No definition available.
+ Details**Name:**hrs_BorrowingsInNonUSCurrencySubLimitUnder2012CreditAgreement**Namespace Prefix:**hrs_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Credit Arrangements Textuals Abstract.
+ References
No definition available.
+ Details**Name:**hrs_CreditArrangementsTextualsAbstract**Namespace Prefix:**hrs_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 |
| X                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Initial interest rate margin over LIBOR.
+ References
No definition available.
+ Details**Name:**hrs_InitialInterestRateMarginOverLibor**Namespace Prefix:**hrs_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
LIBOR divisor
+ References
No definition available.
+ Details**Name:**hrs_LiborDivisor**Namespace Prefix:**hrs_**Data Type:**xbrli:pureItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.
+ References
No definition available.
+ Details**Name:**hrs_LineOfCreditFacilityCommitmentFeePercentageMaximum**Namespace Prefix:**hrs_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.
+ References
No definition available.
+ Details**Name:**hrs_LineOfCreditFacilityCommitmentFeePercentageMinimum**Namespace Prefix:**hrs_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 |
| X                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum alternate interest rate margin over the base rate.
+ References
No definition available.
+ Details**Name:**hrs_MaximumAlternateInterestRateMarginOverBaseRate**Namespace Prefix:**hrs_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum alternate interest rate margin over LIBOR.
+ References
No definition available.
+ Details**Name:**hrs_MaximumAlternateInterestRateMarginOverLibor**Namespace Prefix:**hrs_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum Amount Of Credit Extensions Available Under 2012 Credit Agreement
+ References
No definition available.
+ Details**Name:**hrs_MaximumAmountOfCreditExtensionsAvailableUnder2012CreditAgreement**Namespace Prefix:**hrs_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum alternate interest rate margin over the base rate.
+ References
No definition available.
+ Details**Name:**hrs_MinimumAlternateInterestRateMarginOverBaseRate**Namespace Prefix:**hrs_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum alternate interest rate margin over LIBOR.
+ References
No definition available.
+ Details**Name:**hrs_MinimumAlternateInterestRateMarginOverLibor**Namespace Prefix:**hrs_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 |
| X                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Provision for maximum amount of commitments increase under 2012 Credit Agreement
+ References
No definition available.
+ Details**Name:**hrs_ProvisionForMaximumAmountOfCommitmentsIncreaseUnder2012CreditAgreement**Namespace Prefix:**hrs_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sub limit for letters of credit.
+ References
No definition available.
+ Details**Name:**hrs_SubLimitForLettersOfCredit**Namespace Prefix:**hrs_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sub limit for swingline loans
+ References
No definition available.
+ Details**Name:**hrs_SubLimitForSwingLineLoans**Namespace Prefix:**hrs_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Term of senior unsecured revolving credit agreement
+ References
No definition available.
+ Details**Name:**hrs_TermOfSeniorUnsecuredRevolvingCreditAgreement**Namespace Prefix:**hrs_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of the sum of the obligations to contract holders to provide to them an agreed upon rate of return pursuant to the terms of the underlying contract. These contracts represent lending by the contract holders to the entity in return for a guaranteed (primarily fixed) interest rate until maturity, unless called earlier if the contracts provide that option to the contract holders (usually institutions). There is little or no insurance risk for the entity.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.14) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910
+ Details**Name:**us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.
+ 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(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 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=d3e572229-122910Reference 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(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878
+ Details**Name:**us-gaap_CommercialPaper**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 |
| X                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.
+ References
No definition available.
+ Details**Name:**us-gaap_LineOfCreditFacilityCommitmentFeePercentage**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
+ 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
+ Details**Name:**us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_VariableRateAxis=us-gaap_EurodollarMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |