XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Recently Adopted Accounting Pronouncements Recent Accounting Pronouncements (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 30, 2018 USD ($) | Mar. 30, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Excess tax benefit from share-based compensation, operating activities | $ 46 | $ 73
Retained Earnings | Accounting Standards Update 2016-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | 70 | 70
Retained Earnings | Accounting Standards Update 2016-09 | Windfall Tax Benefit, Unrecognized |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | 58 | 58
Retained Earnings | Accounting Standards Update 2016-09 | Cumulative Adjustment, Change in Accounting Policy |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | 19 | 19
Retained Earnings | Accounting Standards Update 2016-09 | Cumulative Adjustment, Change in Accounting Policy, Tax Impact |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting principle in period of adoption | $ (7) | $ (7)

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
Name: | us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201609Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | wdc_CumulativeAdjustmentScenarioAxis=wdc_WindfallTaxBenefitUnrecognizedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | wdc_CumulativeAdjustmentScenarioAxis=wdc_CumulativeAdjustmentChangeinAccountingPolicyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | wdc_CumulativeAdjustmentScenarioAxis=wdc_CumulativeAdjustmentChangeinAccountingPolicyTaxImpactMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |