XML 88 R70.htm IDEA: XBRL DOCUMENT v3.20.4

Income Tax Expense - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended	6 Months Ended
	Dec. 10, 2018	Jun. 28, 2018	Jan. 01, 2021	Jan. 01, 2021	Sep. 30, 2020	May 04, 2020
Income Tax Disclosure [Line Items]
Net of tax adjustments			$ 8	$ 8
Net tax deficiencies			12	12
Additional tax expense from re-measurement of deferred tax liabilities			10	10
Unrecognized tax benefits			715	715
Penalties and interest accrued on unrecognized tax benefits			146	146
Potential payables related to unrecognized tax benefits			$ 724	$ 724
Internal Revenue Service (IRS) | Tax Year 2008 Through 2009
Income Tax Disclosure [Line Items]
Federal tax, subject to interest		$ 516
Internal Revenue Service (IRS) | Tax Years 2010 Through 2012
Income Tax Disclosure [Line Items]
Federal tax, subject to interest	$ 549
Federal tax related to adjustments for transfer pricing	$ 535
Penalties asserted						$ 340
Internal Revenue Service (IRS) | Tax Years 2013 Through 2015
Income Tax Disclosure [Line Items]
Additional tax					$ 343

X

- Definition

Estimated amount of loss resulting from an adverse tax position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

+ Details

Name:	us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

X

- Definition

Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

+ Details

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

X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

+ Details

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

X

- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

+ Details

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

X

- Definition

Effective Income Tax Reconciliation, Discrete Tax Effects, Net of Adjustments

+ References

No definition available.

+ Details

Name:	wdc_EffectiveIncomeTaxReconciliationDiscreteTaxEffectsNetOfAdjustments
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Effective Income Tax Reconciliation, Discrete Tax Effects, Net Tax Deficiencies

+ References

No definition available.

+ Details

Name:	wdc_EffectiveIncomeTaxReconciliationDiscreteTaxEffectsNetTaxDeficiencies
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income Tax Examination, Additional Tax

+ References

No definition available.

+ Details

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

X

- Definition

Income Tax Examination, Estimate of Possible Loss Resulting From Transfer Pricing Adjustments

+ References

No definition available.

+ Details

Name:	wdc_IncomeTaxExaminationEstimateofPossibleLossResultingFromTransferPricingAdjustments
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income Tax Examination, Penalties Asserted

+ References

No definition available.

+ Details

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

X

- Definition

Unrecognized Tax Benefits Payable

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=wdc_TaxYear2008Through2009Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=wdc_TaxYears2010Through2012Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxPeriodAxis=wdc_TaxYears2013Through2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: