XML 79 R64.htm IDEA: XBRL DOCUMENT
v3.19.1

Shareholders' Equity - Unrecognized Share-based Compensation (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 29, 2019 USD ($)
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items] |
Unamortized Compensation Costs | $ 651
Options |
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items] |
Unamortized Compensation Costs | $ 12
Weighted Average Service Period | 1 year 2 months
RSUs and PSUs |
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items] |
Unamortized Compensation Costs | $ 577
Weighted Average Service Period | 2 years 6 months
ESPP |
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items] |
Unamortized Compensation Costs | $ 62
Weighted Average Service Period | 1 year 8 months

X
- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Schedule of employee share-based awards, unrecognized compensation in tabular format. + References No definition available. + Details
Name: | wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsLineItems
Namespace Prefix: | wdc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=wdc_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |