| **Business Combinations (Tables)**                    | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Business Combinations [Abstract]**                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Consideration Paid for Exelis Acquisition             | The following table provides further detail of the fair value of consideration paid related to the Exelis acquisition in fiscal 2015 (dollars in millions):Date of acquisition  May 29, 2015Cash consideration paid for Exelis outstanding common stock  $3,128Cash consideration paid for Exelis outstanding stock options  125Cash consideration paid for Exelis outstanding restricted stock units  38Cash consideration paid for dividends to Exelis shareholders  21    Total cash consideration paid  3,312Less cash acquired  (130)    Net cash consideration paid  3,182Fair value of Harris common stock issued for Exelis common stock  1,527    Total net purchase price paid  $4,709                                                                                                                                                                                                                                                                                                              |
| Fair Value of Assets Acquired and Liabilities Assumed | The following table summarizes the final fair value of assets acquired and liabilities assumed at the date of the acquisition, as well as adjustments made during the measurement period: Fair value of assets acquired and liabilities assumed:Preliminary Measurement period adjustments, net Final       (In millions)Receivables$592 $(24) $568Inventories438 (38) 400Other current assets587 15 602Property, plant and equipment458 33 491Goodwill4,690 40 4,730Identifiable intangible assets1,606 12 1,618Other non-current assets173 116 289Total assets acquired8,544 154 8,698      Accounts payable and accrued expenses489 133 622Advance payments and unearned income225 (18) 207Defined benefit plans2,311 — 2,311Long-term debt726 — 726Other long-term liabilities84 39 123Total liabilities assumed3,835 154 3,989      Net assets acquired$4,709 $— $4,709       |
| Identifiable Intangible Assets Acquired               | The following table provides further detail of the final fair value and weighted-average amortization period of intangible assets acquired by major intangible asset class: Exelis WeightedAverageAmortizationPeriod Total (In years) (In millions)Identifiable Intangible Assets:   Customer relationships13 $1,413Developed technology11 150Trade names and trademarks — Exelis2 15Trade names and trademarks — Product10 40Weighted average amortization period and total13 $1,618                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Pro Forma results (Unaudited)                         | In the following table, “income from continuing operations” refers to income from continuing operations attributable to Harris Corporation common shareholders. 2015 2014     (In millions)Revenue from product sales and services — as reported$5,083 $5,012Revenue from product sales and services — pro forma$8,085 $8,287Income from continuing operations — as reported$334 $540Income from continuing operations — pro forma$455 $707                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |

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| - Definition
Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.
+ References
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No definition available.
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| - Definition
Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table  does not include leveraged buyouts.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1486-128463Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463
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| - Definition
Tabular disclosure of finite-lived intangible assets acquired as part of a business combination or through an asset purchase, by major class and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period.
+ References
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| - Definition
Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472
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