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Acquisitions Virident purchase price allocation (Details) (USD $)
In Millions, unless otherwise specified
Apr. 03, 2015
Jun. 27, 2014
Oct. 17, 2013
Business Acquisition [Line Items]      
Goodwill $ 2,745us-gaap_Goodwill $ 2,559us-gaap_Goodwill  
Virident [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     58us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= wdc_ViridentMember
Intangible assets     49us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wdc_ViridentMember
Goodwill     506us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wdc_ViridentMember
Total     $ 613us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= wdc_ViridentMember