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Shareholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Oct. 04, 2019	Sep. 28, 2018
Share-based Payment Arrangement [Abstract]
Cash dividends declared per share (in USD per share)	$ 0.50	$ 0.50
Dividends declared	$ 149	$ 144

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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