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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Apr. 03, 2015
Mar. 28, 2014
Income Tax Disclosure [Line Items]        
Income tax provision $ 28us-gaap_IncomeTaxExpenseBenefit $ 31us-gaap_IncomeTaxExpenseBenefit $ 85us-gaap_IncomeTaxExpenseBenefit $ 105us-gaap_IncomeTaxExpenseBenefit
Tax Benefit Resulting From Retroactive Extension Of Research And Development Credit     16wdc_TaxBenefitResultingFromRetroactiveExtensionOfResearchAndDevelopmentCredit  
Expiration date of tax holiday in Malaysia, Philippines, Singapore and Thailand     from 2015 through 2025  
Increase (Decrease) in liability for unrecognized tax benefits 16us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease   32us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease  
Unrecognized tax benefits 332us-gaap_UnrecognizedTaxBenefits   332us-gaap_UnrecognizedTaxBenefits  
Proposed IRS adjustments to Pre-tax income $ 200wdc_ProposedIRSAdjustmentstoPretaxIncome   $ 200wdc_ProposedIRSAdjustmentstoPretaxIncome