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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
In-process research and development reclassified to developed product technology	$ 8,000,000
Impairment charges related to intangible assets	$ 0	$ 0	$ 0
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Useful life	2 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Finite-Lived Intangible Assets, Transferred In From (Out To) Indefinite-Lived Intangible Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: