The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability that is expected to be paid after one year or beyond the normal operating cycle, if longer. Does not include the balance for the extended product warranty liability.

+ References

No definition available.

+ Details

Name:	us-gaap_StandardProductWarrantyAccrualNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percent of commitment by the Company to fund a venture's investment in situations where the venture's sales are insufficient to cover the investments.

+ References

No definition available.

+ Details

Name:	wdc_InvestmentFundingCommitments
Namespace Prefix:	wdc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Joint Ventures [Abstract]

+ References

No definition available.

+ Details

Name:	wdc_JointVenturesAbstract
Namespace Prefix:	wdc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Lease Commitment [Abstract]

+ References

No definition available.

+ Details

Name:	wdc_LeaseCommitmentAbstract
Namespace Prefix:	wdc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Long term purchase commitment in year four.

+ References

No definition available.

+ Details

Name:	wdc_LongTermPurchaseCommitmentInYearFour
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long term purchase commitment in year one.

+ References

No definition available.

+ Details

Name:	wdc_LongTermPurchaseCommitmentInYearOne
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long term purchase commitment in year three.

+ References

No definition available.

+ Details

Name:	wdc_LongTermPurchaseCommitmentInYearThree
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long term purchase commitment in year two.

+ References

No definition available.

+ Details

Name:	wdc_LongTermPurchaseCommitmentInYearTwo
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating leases expiration dates.

+ References

No definition available.

+ Details

Name:	wdc_OperatingLeasesExpirationDates
Namespace Prefix:	wdc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Partner's ownership in venture business.

+ References

No definition available.

+ Details

Name:	wdc_PartnersOwnershipInVentureBusiness
Namespace Prefix:	wdc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	wdc_EquityMethodInvestorNameAxis=wdc_WesternDigitalCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wdc_EquityMethodInvestorNameAxis=wdc_ToshibaCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jun. 27, 2014	Nov. 09, 2015
Lease Commitment [Abstract]
Operating leases consist of leased property that expire at various dates	various dates through 2025
Rental expense	$ 59,000,000	$ 60,000,000	$ 59,000,000
Joint Ventures [Abstract]
Equity Method Investment, Ownership Percentage				49.00%
Partner's ownership in venture business				51.00%
Product Warranties Disclosures [Abstract]
Accrued warranty included in other liabilities	107,000,000	$ 71,000,000
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
2017	15,000,000
2018	7,000,000
2019	1,000,000
2020	$ 0
Western Digital Corp [Member] \| Minimum [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Investment Funding Commitments	49.90%
Western Digital Corp [Member] \| Maximum [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Investment Funding Commitments	50.00%
Toshiba Corp [Member]
Joint Ventures [Abstract]
Partner's ownership in venture business	50.10%