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v3.10.0.1

Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Jul. 03, 2015 | $ 9,219 | $ 3 | $ 2,299 | $ 2,428 | $ (20) | $ 9,107
Beginning Balance, Shares at Jul. 03, 2015 |  | 261.0 | 31.0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 242 |  |  |  |  | 242
Employee stock plans | 67 |  | $ 191 | (124) |  |
Employee stock plans (in shares) |  |  | 5.0 |  |  |
Stock-based compensation | 191 |  |  | 191 |  |
Common stock issued in connection with acquisition | 1,764 |  |  | 1,764 |  |
Common stock issued in connection with acquisition, shares |  | 49.0 |  |  |  |
Stock awards assumed in acquisition | 58 |  |  | 58 |  |
Increase in excess tax benefits from employee stock plans | 7 |  |  | 7 |  |
Shares issued in conjunction with settlement of convertible notes | 94 |  |  | 94 |  |
Shares issued in conjunction with settlement of convertible notes, shares |  | 2.0 |  |  |  |
Shares received in conjunction with assumed call options | (70) |  | $ (70) |  |  |
Shares received in conjunction with assumed call options, shares |  |  | (1.0) |  |  |
Repurchases of common stock | (60) |  | $ (60) |  |  |
Repurchases of common stock, shares |  |  | (1.0) |  |  |
Dividends to shareholders | (490) |  |  | 11 |  | (501)
Actuarial pension loss | (50) |  |  |  | (50) |
Foreign currency translation gains (losses) | 74 |  |  |  | 74 |
Net unrealized gain (loss) on derivative contracts | 99 |  |  |  | 99 |
Ending Balance at Jul. 01, 2016 | 11,145 | $ 3 | $ 2,238 | 4,429 | 103 | 8,848
Ending Balance, Shares at Jul. 01, 2016 |  | 312.0 | 28.0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 397 |  |  |  |  | 397
Employee stock plans | 111 |  | $ 583 | (472) |  |
Employee stock plans (in shares) |  |  | 10.0 |  |  |
Stock-based compensation | 394 |  |  | 394 |  |
Increase in excess tax benefits from employee stock plans | 104 |  |  | 104 |  |
Shares issued in conjunction with settlement of convertible notes | 16 |  |  | 16 |  |
Shares received in conjunction with assumed call options | (11) |  | $ (11) |  |  |
Dividends to shareholders | (577) |  |  | 35 |  | (612)
Actuarial pension loss | 27 |  |  |  | 27 |
Foreign currency translation gains (losses) | (113) |  |  |  | (113) |
Net unrealized gain (loss) on derivative contracts | (75) |  |  |  | (75) |
Ending Balance at Jun. 30, 2017 | 11,418 | $ 3 | $ 1,666 | 4,506 | (58) | 8,633
Ending Balance, Shares at Jun. 30, 2017 |  | 312.0 | 18.0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 681 |  |  |  |  |
Beginning Balance at Jun. 30, 2017 | 11,418 | $ 3 | $ 1,666 | 4,506 | (58) | 8,633
Beginning Balance, Shares at Jun. 30, 2017 |  | 312.0 | 18.0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 675 |  |  |  |  | 675
Employee stock plans | 49 |  | $ 813 | (764) |  |
Employee stock plans (in shares) |  |  | 9.0 |  |  |
Stock-based compensation | 377 |  |  | 377 |  |
Shares issued in conjunction with settlement of convertible notes | 0 |  |  |  |  |
Shares received in conjunction with assumed call options | 0 |  |  |  |  |
Repurchases of common stock | $ (591) |  | $ (591) |  |  |
Repurchases of common stock, shares | (7.1) |  | (7.0) |  |  |
Dividends to shareholders | $ (592) |  |  | 29 |  | (621)
Actuarial pension loss | (1) |  |  |  | (1) |
Foreign currency translation gains (losses) | 18 |  |  |  | 18 |
Net unrealized gain (loss) on derivative contracts | 2 |  |  |  | 2 |
Equity value of convertible debt issuance, net of deferred taxes | 125 |  |  | 125 |  |
Ending Balance at Jun. 29, 2018 | 11,531 | $ 3 | $ 1,444 | 4,254 | $ (39) | 8,757
Ending Balance, Shares at Jun. 29, 2018 |  | 312.0 | 16.0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adoption of New Accounting Standards | $ 51 |  |  | $ (19) |  | $ 70

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- Definition Adjustments to additional paid in capital tax effect of employee stock plans. + References No definition available. + Details
Name: | wdc_AdjustmentsToAdditionalPaidInCapitalTaxEffectOfEmployeeStockPlans
Namespace Prefix: | wdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The value of stock acquired during the period convertible securities hedge. + References No definition available. + Details
Name: | wdc_ConvertibleNoteHedgeAmount
Namespace Prefix: | wdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Equity impact of dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period. + References No definition available. + Details
Name: | wdc_DividendsDeclared
Namespace Prefix: | wdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares acquired during the period as a result of the convertible security hedge. + References No definition available. + Details
Name: | wdc_StockAcquiredDuringPeriodSharesConvertibleSecuritiesHedge
Namespace Prefix: | wdc_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration