| **Business Segments (Tables)**                    | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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| **Segment Reporting [Abstract]**                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Summary of total assets by business segment       | Selected information by business segment and geographical area is summarized below: 2016 2015 2014       (In millions)Total Assets     Communication Systems$1,667 $1,917 $1,274Space and Intelligence Systems2,149 2,092 523Electronic Systems2,253 2,508 278Critical Networks3,001 3,490 1,901Corporate(1)2,926 3,120 943 $11,996 $13,127 $4,919Capital Expenditures     Communication Systems$16 $26 $43Space and Intelligence Systems38 52 70Electronic Systems22 14 21Critical Networks37 49 70Corporate41 7 5 $154 $148 $209Depreciation and Amortization     Communication Systems$63 $65 $61Space and Intelligence Systems40 32 27Electronic Systems28 15 8Critical Networks83 103 101Corporate147 29 7 $361 $244 $204Geographical Information for Continuing Operations     U.S. operations:     Revenue$7,046 $4,659 $4,590Long-lived assets$977 $1,099 $648International operations:     Revenue$421 $424 $422Long-lived assets$38 $66 $80(1)  Identifiable intangibles assets acquired in connection with our acquisition of Exelis in the fourth quarter of fiscal 2015 were recorded as Corporate assets because they benefited the entire Company as opposed to any individual segments. Exelis identifiable asset balances recorded as Corporate assets were approximately $1.4 billion and $1.6 billion as of July 1, 2016 and July 3, 2015, respectively. Corporate assets consisted primarily of cash, income taxes receivable, deferred income taxes, deferred compensation plan investments, buildings and equipment and identifiable intangibles.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Revenue and income before income taxes by segment | Segment revenue, segment operating income (loss) and a reconciliation of segment operating income to total income from continuing operations before income taxes follow:Revenue 2016 2015 2014       (In millions)Communication Systems$1,864 $1,836 $1,855Space and Intelligence Systems1,899 1,007 966Electronic Systems1,530 584 420Critical Networks2,233 1,680 1,786Corporate eliminations(59) (24) (15) $7,467 $5,083 $5,012Income From Continuing Operations Before Income Taxes 2016 2015(4) 2014       (In millions)Segment Operating Income (Loss):     Communication Systems (1)$530 $563 $574Space and Intelligence Systems294 142 128Electronic Systems277 97 72Critical Networks (2)(106) 131 198Unallocated corporate expense (3)(210) (210) (77)Corporate eliminations(3) (10) (13)Non-operating income (loss) 10 (108) 4Net interest expense(181) (128) (91) $611 $477 $795 (1)Communication Systems operating income in fiscal 2016 included $20 million of restructuring charges primarily related to workforce reductions, facility consolidation and other items. We recorded $14 million of these charges in the “Cost of product sales and services” line item and the remaining $6 million of these charges in the “Engineering, selling and administrative expenses” line item in our Consolidated Statement of Income.(2)Critical Networks operating loss in fiscal 2016 was primarily due to a $367 million non-cash impairment charge recorded in the quarter ended January 1, 2016 to write down goodwill and other assets related to Harris CapRock Communications. We recorded this charge in the “Impairment of goodwill and other assets” line item in our Consolidated Statement of Income. Additionally, operating loss in fiscal 2016 included $13 million of restructuring charges primarily related to workforce reductions and facility consolidation. We recorded $7 million of these charges in the “Cost of product sales and services” line item and the remaining $6 million of these charges in the “Engineering, selling and administrative expenses” line item in our Consolidated Statement of Income.(3)Unallocated corporate expense in fiscal 2016 included: (i) the impact of a net liability reduction of $101 million for certain post-employment benefit plans, (ii) charges of $104 million for integration and other costs associated with our acquisition of Exelis in the fourth quarter of fiscal 2015, (iii) $11 million for amortization of a step up in inventory, and (iv) $132 million of expense for amortization of intangible assets acquired as a result of our acquisition of Exelis. Because the acquisition of Exelis benefited the entire Company as opposed to any individual segments, the amortization of identifiable intangible assets acquired in the Exelis acquisition was recorded as unallocated corporate expense.(4)“Non-operating income (loss)” includes loss on prepayment of long-term debt. Additional information regarding non-operating income (loss) is set forth in Note 21: Non-Operating Income (Loss). |

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| - Definition
Revenue and Income before Income Taxes by Segment.
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| - Definition
Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.
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