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Acquisitions sTec Purchase Price Allocation (Details) (USD $)
In Millions, unless otherwise specified
Jan. 02, 2015
Jun. 27, 2014
Sep. 12, 2013
Business Acquisition [Line Items]      
Goodwill $ 2,566us-gaap_Goodwill $ 2,559us-gaap_Goodwill  
sTec [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     189us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= wdc_STecMember
Intangible assets     58us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wdc_STecMember
Goodwill     89us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wdc_STecMember
Total     $ 336us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= wdc_STecMember