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Share-based Compensation (Narrative) (Details) |  | 12 Months Ended |  |  |  |
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Nov. 04, 2011 shares | Jun. 30, 2017 USD ($) mo $ / shares shares | Jul. 01, 2016 USD ($) $ / shares shares | Jul. 03, 2015 USD ($) shares | Oct. 19, 2016 $ / shares shares | Apr. 22, 2015 USD ($) | Oct. 24, 2014 $ / shares shares | Oct. 26, 2011 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Par value (usd per share) | $ / shares |  | $ 0.00001 | $ 0.00001 |  |  |  |  |
Share-based compensation |  | $ 137,000,000 | $ 120,000,000 | $ 137,000,000 |  |  |  |
Tax-Deferred Savings Plan |  |  |  |  |  |  |  |
Percentage match of employee contribution under 401(k) plan (as a percent) |  | 50.00% |  |  |  |  |  |
Maximum contribution match by the employer as a percentage of employee compensation (as a percent) |  | 6.00% |  |  |  |  |  |
Maximum amount of contribution per employee made by the employer per year |  | $ 4,500 |  |  |  |  |  |
Matching contributions |  | 18,000,000 | 19,000,000 | 18,000,000 |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised |  | 29,000,000 | 44,000,000 | 92,000,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  | 15,000,000 | 18,000,000 | 10,000,000 |  |  |  |
Unrecognized compensation cost |  | $ 25,000,000 |  |  |  |  |  |
Number of shares, granted | shares |  | 2,300,000 |  |  |  |  |  |
Unrecognized compensation cost of estimated forfeitures |  | $ 1,000,000 |  |  |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  | 2 years 6 months |  |  |  |  |  |
STX 2012 EIP [Member] | Stock Compensation Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized | shares |  |  |  |  | 7,500,000.0 |  | 25,000,000 | 27,000,000
Par value (usd per share) | $ / shares |  |  |  |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001
Share Reserves ratio, granted |  | 2.5 |  |  |  |  |  |
Number of shares available for grant | shares |  | 30,800,000.0 |  |  |  |  |  |
STX 2004 SCP [Member] | Stock Compensation Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares deregistered from the plan | shares | 11,000,000 |  |  |  |  |  |  |
Equity Incentive Plan Dot Hill 2009 [Member] [Domain] | Stock Compensation Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized | shares |  | 2,000,000 |  |  |  |  |  |
Share Reserves ratio, granted |  | 1.5 |  |  |  |  |  |
Number of shares available for grant | shares |  | 1,000,000.0 |  |  |  |  |  |
ESPP [Member] | Employee Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized | shares |  | 50,000,000 |  |  |  |  |  |
Per share weighted average price of shares purchased | $ / shares |  | $ 26.68 |  |  |  |  |  |
Number of shares available for grant | shares |  | 4,800,000.0 |  |  |  |  |  |
Offering period for Stock Purchase Plan (in months) |  | 6 months |  |  |  |  |  |
Maximum number of shares per offering period | shares |  | 1,500,000 |  |  |  |  |  |
Employee purchase price, percentage of fair market value of ordinary shares |  | 85.00% |  |  |  |  |  |
Aggregate intrinsic value of options exercised |  | $ 24,000,000 | $ 12,000,000 | $ 15,000,000 |  |  |  |
Unrecognized compensation cost |  | $ 1,700,000 |  |  |  |  |  |
Number of shares, granted | shares |  | 2,000,000 |  |  |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  | 1 month |  |  |  |  |  |
Full Value Share Awards [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  | 4 years |  |  |  |  |  |
Full Value Share Awards [Member] | Restricted Stock Units (RSUs) [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |
Full Value Share Awards [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of options to be vested proportionately after first Anniversary of vesting commencement date (as a percent) |  | 75.00% |  |  |  |  |  |
Remaining award vesting period (in months) | mo |  | 36 |  |  |  |  |  |
TSR/ROIC [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of stock units targeted to vest (in shares) | shares |  | 600,000 | 400,000 | 300,000 |  |  |  |
Performance period (in years) |  | 3 years |  |  |  |  |  |
Minimum percentage of targeted stock units to vest (as a percent) |  | 0.00% |  |  |  |  |  |
Maximum percentage of targeted stock units to vest (as a percent) |  | 200.00% |  |  |  |  |  |
TSR/ROIC [Member] | Performance Shares [Member] | Senior Executive Officers [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | shares |  | 200,000 | 200,000 |  |  |  |  |
AEPS [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual vesting percentage for share awards and restricted units (as a percent) |  | 25.00% |  |  |  |  |  |
Award vesting period |  | 7 years |  |  |  |  |  |
AEPS [Member] | Performance Shares [Member] | Senior Executive Officers [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | shares |  |  |  | 400,000 |  |  |  |
AEPS [Member] | Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  | 7 years |  |  |  |  |  |
Nonvested Shares [Member] | Stock Compensation Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  | $ 135,000,000 |  |  |  |  |  |
Unrecognized compensation cost of estimated forfeitures |  | $ 8,000,000 |  |  |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  | 2 years 7 months 6 days |  |  |  |  |  |
Aggregate fair value of nonvested shares vested |  | $ 73,000,000 | $ 102,000,000 | $ 156,000,000 |  |  |  |
Performance Awards Market Condition [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  | $ 36,000,000 |  |  |  |  |  |
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition |  | 3 years 3 months 14 days |  |  |  |  |  |
April 2015 Share Repurchase Program [Domain] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 2,500,000,000 |  |
Share-based Compensation Award, Tranche One [Member] | Full Value Share Awards [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of options to be vested on first anniversary of vesting commencement date (as a percent) |  | 25.00% |  |  |  |  |  |

X
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- Definition As of the balance sheet date, unrecognized cost of estimated forfeitures of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References No definition available. + Details
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- Definition Percentage of shares to be vested proportionately over the next 36 months of the vesting commencement date. + References No definition available. + Details
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- Definition This element represents the maximum percentage of target share-based awards that may vest. + References No definition available. + Details
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- Definition This element represents the minimum percentage of target share-based awards that may vest. + References No definition available. + Details
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- Definition This element represents the number of share-based payment equity instruments (excluding stock options) targeted to vest. + References No definition available. + Details
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- Definition Description of the remaining period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition Represents the maximum number of shares to be issued under the Stock Purchase Plan per offering period. + References No definition available. + Details
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- Definition This element represents the period (in years) for which performance is measured against the performance criteria. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Share Reserve Ratio + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- 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
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- Definition Net number of non-option equity instruments granted to participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Other than shares newly issued, the number of additional shares issued (for example, a stock split) or canceled (for example, to correct a share issuance), during the period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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