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Shareholders' Equity - Unrecognized Share-based Compensation (Details) $ in Millions	12 Months Ended
	Jul. 02, 2021 USD ($)
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items]
Unamortized Compensation Costs	$ 608
RSUs and PSUs
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items]
Unamortized Compensation Costs	$ 543
Weighted Average Service Period	2 years 4 months 24 days
ESPP
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items]
Unamortized Compensation Costs	$ 65
Weighted Average Service Period	1 year 9 months 18 days

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ 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=120381028&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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=120381028&loc=d3e5070-113901

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X

- Definition

[Line Items] for Schedule of employee share-based awards, unrecognized compensation in tabular format.

+ References

No definition available.

+ Details

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Namespace Prefix:	wdc_
Data Type:	xbrli:stringItemType
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: