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Supplemental Financial Statement Data - Inventories; Property, Plant and Equipment; and Other Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 02, 2015
Jun. 27, 2014
Inventories:    
Raw materials and component parts $ 154us-gaap_InventoryRawMaterialsNetOfReserves $ 168us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 510us-gaap_InventoryWorkInProcessNetOfReserves 493us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 618us-gaap_InventoryFinishedGoodsNetOfReserves 565us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories 1,282us-gaap_InventoryNet 1,226us-gaap_InventoryNet
Property, plant and equipment:    
Property, plant and equipment 8,353us-gaap_PropertyPlantAndEquipmentGross 8,123us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (5,254)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (4,830)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, net 3,099us-gaap_PropertyPlantAndEquipmentNet 3,293us-gaap_PropertyPlantAndEquipmentNet
Other intangible assets:    
Other intangible assets, gross 983wdc_OtherIntangibleAssetsGross 984wdc_OtherIntangibleAssetsGross
Accumulated amortization (624)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (530)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Other intangible assets, net $ 359us-gaap_OtherIntangibleAssetsNet $ 454us-gaap_OtherIntangibleAssetsNet