| **Pension and Other Postretirement Benefits (Tables)**                                                                         | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Compensation and Retirement Disclosure [Abstract]**                                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of fair value of deferred compensation plan investments and liabilities by category and by fair value hierarchy level | The following table provides the fair value our deferred compensation plan investments and liabilities by category and by fair value hierarchy level as of July 1, 2016: Level 1 Level 2 Level 3 Total        Assets       Deferred compensation plan investments: (1)       Corporate-owned life insurance$— $23 $— $23Stock fund44 — — 44Equity security38 — — 38Liabilities       Deferred compensation plans (2)44 72 — 116(1)Represents investments held in a Rabbi Trust associated with our non-qualified deferred compensation plans, which we include in the “Deferred compensation plan investments” and “Other non-current assets” line items in our Consolidated Balance Sheet.(2)Primarily represents obligations to pay benefits under certain non-qualified deferred compensation plans, which we include in the “Deferred compensation plan liabilities” and “Other long-term liabilities” line items in our Consolidated Balance Sheet. Under these plans, participants designate investment options (including money market, stock and fixed-income funds), which serve as the basis for measurement of the notional value of their accounts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Summary of the funded status of defined benefit plans                                                                          | The following table provides a summary of the funded status of our defined benefit plans and the presentation of such balances within our Consolidated Balance Sheet: July 1, 2016 July 3, 2015 Pension OtherBenefits Total Pension OtherBenefits Total             (In millions) (In millions)Fair value of plan assets$4,273 $216 $4,489 $4,500 $257 $4,757Projected benefit obligation(6,471) (311) (6,782) (6,493) (445) (6,938)Funded status(2,198) (95) (2,293) (1,993) (188) (2,181)Amounts reported within:           Other non-current assets5 — 5 7 — 7Deferred compensation plan liabilities(2) — (2) (245) — (245)Defined benefit plans$(2,201) $(95) $(2,296) $(1,755) $(188) $(1,943)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Summary of amounts recorded within accumulated other comprehensive loss                                                        | The following table provides a summary of pre-tax amounts recorded within accumulated other comprehensive loss: July 1, 2016 July 3, 2015 Pension OtherBenefits Total Pension OtherBenefits Total             (In millions) (In millions)Net actuarial loss (gain)$546 $11 $557 $(98) $(2) $(100)Net prior service cost (credit)3 (1) 2 — (6) (6) $549 $10 $559 $(98) $(8) $(106)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Schedule of changes in benefit obligation                                                                                      | The following table provides a roll-forward of the projected benefit obligations for our defined benefit plans:  2016 2015  Pension OtherBenefits Total Pension OtherBenefits Total               (In millions) (In millions)Change in benefit obligation           Benefit obligation at beginning of fiscal year$6,493 $445 $6,938 $83 $21 $104Liabilities assumed through acquisition— — — 6,619 460 7,079Service cost75 1 76 7 1 8Interest cost245 13 258 23 2 25Actuarial loss (gain)303 (2) 301 (201) (13) (214)Prior service cost (credit)(1)3 (121) (118) — (19) (19)Benefits paid(358) (24) (382) (32) (4) (36)Settlements(2)(244) — (244) — — —Special termination benefits1 — 1 — — —Expenses paid(30) — (30) — — —Curtailments(3)(2) (1) (3) — — —Foreign Exchange(15) — (15) (6) — (6)Other— — — — (3) (3)Benefit obligation at end of fiscal year$6,471 $311 $6,782 $6,493 $445 $6,938             (1)  We discontinued certain significantly underfunded post-employment benefit plans effective December 31, 2015. Under GAAP, this resulted in a negative plan amendment, curtailment and settlement during the year.(2)  We made lump sum distributions to participants covered under one of the Exelis Inc. excess pension plans that became payable within 90 days from the close of the acquisition on May 29, 2015. These distributions resulted in a settlement during the quarter ended October 2, 2015 and a net liability reduction of $244 million.(3)  We discontinued operations at one of our facilities during fiscal 2016, with the facility consolidation completing during the quarter ended July 1, 2016. Under GAAP, this resulted in a curtailment during the quarter ended January 1, 2016, and a net pension liability reduction of $2 million. Additionally, see note (1) above for information about the other benefits curtailment. |
| Schedule of change in plan assets                                                                                              | The following table provides a roll-forward of the assets and the ending funded status of our defined benefit plans:  2016 2015  Pension OtherBenefits Total Pension OtherBenefits Total               (In millions) (In millions)Change in plan assets           Plan assets at beginning of fiscal year$4,500 $257 $4,757 $91 $— $91Assets acquired through acquisition— — — 4,499 269 4,768Actual return on plan assets1 (1) — (52) (4) (56)Employer contributions420 1 421 1 — 1Benefits paid(358) (25) (383) (32) (8) (40)Settlements(244) — (244) — — —Expenses paid(30) — (30) — — —Foreign exchange loss(16) — (16) (7) — (7)Other(1)— (16) (16) — — —Plan assets at end of fiscal year$4,273 $216 $4,489 $4,500 $257 $4,757            Funded status at end of fiscal year$(2,198) $(95) $(2,293) $(1,993) $(188) $(2,181)             (1)  We discontinued certain significantly underfunded post-employment benefit plans effective December 31, 2015. As a result, the remaining assets of the Employee Benefit Trust were designated for other employee benefit costs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of accumulated and projected benefit obligations                                                                      | The following table provides information for defined benefit pension plans with an accumulated benefit obligation in excess of plan assets: July 1, 2016 July 3, 2015 (In millions) (In millions)Projected benefit obligation$6,390 $6,407Accumulated benefit obligation6,379 6,387Fair value of plan assets4,187 4,407                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Schedule of net benefit costs                                                                                                  | The following table provides the components of net periodic benefit cost and other amounts recognized in other comprehensive income for fiscal 2016 and 2015, as they pertain to our defined benefit plans:  2016 2015  Pension OtherBenefits Total Pension OtherBenefits Total               (In millions) (In millions)Net periodic benefit income           Service cost$75 $1 $76 $7 $1 $8Interest cost245 13 258 23 2 25Expected return on plan assets(347) (18) (365) (32) (2) (34)Amortization of prior service credit— (5) (5) — (13) (13)Amortization of net actuarial loss1 1 2 1 6 7Net periodic benefit income(26) (8) (34) (1) (6) (7)Effect of curtailments, settlements or special termination benefits(1)1 (121) (120) — — —Total net periodic benefit income(25) (129) (154) (1) (6) (7)Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income)           Net actuarial loss (gain)645 15 660 (117) (5) (122)Prior service cost (credit)(1)3 (121) (118) — (19) (19)Amortization of prior service credit(1)— 126 126 — 13 13Amortization of net actuarial loss(1) (2) (3) (1) (6) (7)Total change recognized in other comprehensive loss (income) 647 18 665 (118) (17) (135)Total impact from net periodic benefit cost and changes in other comprehensive loss (income)$622 $(111) $511 $(119) $(23) $(142)             (1)  We discontinued certain significantly underfunded post-employment benefit plans effective December 31, 2015. Under GAAP, this resulted in a negative plan amendment, curtailment and settlement during the year.                                                                                                                                                                                                                                                                                                                |
| Estimated net actuarial loss and prior service cost to be amortized from AOCL                                                  | The following table provides the estimated net actuarial loss and prior service cost that will be amortized from accumulated other comprehensive loss into net periodic cost during fiscal 2017: Pension OtherBenefits Total       (In millions)Net actuarial loss$1 $— $1Prior service cost— — — $1 $— $1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Schedule of assumptions used                                                                                                   | The following table provides the weighted-average assumptions used to determine projected benefit obligations and net periodic benefit cost, as they pertain to our other postretirement defined benefit plans:Obligation assumptions as of:July 1, 2016 July 3, 2015Discount rate3.41% 3.86%Rate of future compensation increaseN/A 2.75%    Cost assumptions for fiscal year: 2016 2015Discount rate3.86% 3.57%Rate of future compensation increase2.75% 2.75%The following table provides the weighted-average assumptions used to determine projected benefit obligations and net periodic benefit cost, as they pertain to our defined benefit pension plans:Obligation assumptions as of:July 1, 2016 July 3, 2015Discount rate3.62% 4.06%Rate of future compensation increase2.75% 2.76%    Cost assumptions for fiscal years: 2016 2015Discount rate4.06% 3.77%Expected return on plan assets7.91% 7.93%Rate of future compensation increase2.76% 2.76%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Schedule of the strategic target asset allocation ranges                                                                       | The following table provides the current strategic target asset allocation ranges by asset category: Target AssetAllocationEquity investments50%—75%Fixed income investments20%—42%Hedge funds5%—12%Cash and cash equivalents0%—10%The following table provides the fair value of plan assets held by our defined benefit plans by asset category and by fair value hierarchy level: July 1, 2016 Total Level 1 Level 2 Level 3         (In millions)Asset Category       Equities:       Domestic equities$1,410 $1,070 $340 $—International equities724 452 272 —Alternative investments:       Private equity664 — — 664Hedge funds329 — 47 282Commodities and real estate36 — — 36Fixed income:       Corporate bonds557 — 557 —Government securities571 — 571 —Other2 — — 2Cash and cash equivalents197 31 166 —Total4,490 $1,553 $1,953 $984Payables, net(1)      Total fair value of plan assets$4,489               July 3, 2015 Total Level 1 Level 2 Level 3 (In millions)Asset Category       Equities:       Domestic equities$1,560 $1,216 $344 $—International equities801 352 304 145Alternative investments:       Private equity886 — — 886Hedge funds420 33 49 338Commodities and real estate45 — — 45Fixed income:       Corporate bonds363 — 363 —Government securities366 — 366 —Other84 — 71 13Cash and cash equivalents236 30 206 —Total4,761 $1,631 $1,703 $1,427Payables, net(4)      Total fair value of plan assets$4,757                                                                                                                                             |
| Reconciliation of defined benefit plan asset balances that use significant unobservable inputs                                 | The following table presents a reconciliation of the beginning and ending defined benefit plan asset balances that use significant unobservable inputs (Level 3) to measure fair value: PrivateEquity, Commodities and Real Estate HedgeFunds Equity Other Total     (In millions)    Level 3 balance — June 27, 2014$— $— $— $— $—Transfers in via acquisition932 352 148 13 1,445Realized gains, net9 — — — 9Unrealized gains (losses), net14 (10) (3) — 1Sales, net(24) (4) — — (28)Level 3 balance — July 3, 2015931 338 145 13 1,427Realized gains (losses), net109 (8) 127 1 229Unrealized losses, net(121) (20) (137) (3) (281)Sales, net(219) (28) (135) (9) (391)Level 3 balance — July 1, 2016$700 $282 $— $2 $984                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Schedule of estimated future benefit payments                                                                                  | The following table provides the projected timing of payments for benefits earned to date and the expectation that certain future service will be earned by current active employees for our defined benefit plans: Pension OtherBenefits Total (In millions)Fiscal Years:     2017$393 $29 $4222018378 28 4062019380 28 4082020383 28 4112021384 27 4112022 — 20261,914 119 2,033                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |

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Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation.
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| - Definition
Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans.  This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.
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| - Definition
Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.
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| - Definition
Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.
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| - Definition
Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.
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| - Definition
Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.
+ References
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| - Definition
Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.
+ References
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| - Definition
Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements.
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| - Definition
Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period.
+ References
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| - Definition
Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.
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| - Definition
Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.
+ References
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