1.0.0.3 false Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 6 Current assets: 4 us-gaap_AssetsCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 7 Cash and cash equivalents 5 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 true true 2435000000 2435 false false 2 true true 1794000000 1794 false false No definition available. No authoritative reference available. false 8 Accounts receivable, net 5 us-gaap_AccountsReceivableNetCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 1365000000 1365 false false 2 false true 926000000 926 false false No definition available. No authoritative reference available. false 9 Inventories 5 us-gaap_InventoryNet us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 453000000 453 false false 2 false true 376000000 376 false false No definition available. No authoritative reference available. false 10 Other current assets 5 us-gaap_OtherAssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 163000000 163 false false 2 false true 134000000 134 false false No definition available. No authoritative reference available. true 11 Total current assets 5 us-gaap_AssetsCurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 4416000000 4416 false false 2 false true 3230000000 3230 false false No definition available. No authoritative reference available. false 12 Property and equipment, net 4 us-gaap_PropertyPlantAndEquipmentNet us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 1696000000 1696 false false 2 false true 1584000000 1584 false false No definition available. No authoritative reference available. false 13 Goodwill 4 us-gaap_Goodwill us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 139000000 139 false false 2 false true 139000000 139 false false No definition available. No authoritative reference available. false 14 Other intangible assets, net 4 wdc_IntangiblesNet wdc false debit instant monetary Net carrying amount after accumulated amortization as of the balance sheet date of intangible assets not otherwise specified... false false false false false false false false false 1 false true 83000000 83 false false 2 false true 89000000 89 false false Net carrying amount after accumulated amortization as of the balance sheet date of intangible assets not otherwise specified in the taxonomy having a reasonably expected period of economic benefit. No authoritative reference available. false 15 Other non-current assets 4 us-gaap_OtherAssetsNoncurrent us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 251000000 251 false false 2 false true 249000000 249 false false No definition available. No authoritative reference available. true 16 Total assets 4 us-gaap_Assets us-gaap true debit instant monetary No definition available. false false false false false false false false false 1 false true 6585000000 6585 false false 2 false true 5291000000 5291 false false No definition available. No authoritative reference available. true 18 Current liabilities: 4 us-gaap_LiabilitiesCurrentAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 19 Accounts payable 5 us-gaap_AccountsPayableCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 1507000000 1507 false false 2 false true 1101000000 1101 false false No definition available. No authoritative reference available. false 20 Accrued expenses 5 us-gaap_AccruedLiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 288000000 288 false false 2 false true 247000000 247 false false No definition available. No authoritative reference available. false 21 Accrued warranty 5 wdc_AccruedWarranty wdc false credit instant monetary The carrying value as of the balance sheet date for estimated warranty costs false false false false false false false false false 1 false true 118000000 118 false false 2 false true 95000000 95 false false The carrying value as of the balance sheet date for estimated warranty costs No authoritative reference available. false 22 Current portion of long-term debt 5 us-gaap_LongTermDebtCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 94000000 94 false false 2 false true 82000000 82 false false No definition available. No authoritative reference available. true 23 Total current liabilities 5 us-gaap_LiabilitiesCurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 2007000000 2007 false false 2 false true 1525000000 1525 false false No definition available. No authoritative reference available. false 24 Long-term debt 4 us-gaap_LongTermDebtNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 350000000 350 false false 2 false true 400000000 400 false false No definition available. No authoritative reference available. false 25 Other liabilities 4 us-gaap_OtherLiabilitiesNoncurrent us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 237000000 237 false false 2 false true 174000000 174 false false No definition available. No authoritative reference available. true 26 Total liabilities 4 us-gaap_Liabilities us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 2594000000 2594 false false 2 false true 2099000000 2099 false false No definition available. No authoritative reference available. false 28 Shareholders' equity: 4 us-gaap_StockholdersEquityAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false No definition available. false 29 Preferred stock, $.01 par value; authorized - 5 shares; outstanding - none 5 wdc_PreferredStockValues wdc false credit instant monetary Dollar value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer)... false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false Dollar value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) whether issued at par value, no par or stated value. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. No authoritative reference available. false 30 Common stock, $.01 par value; authorized - 450 shares; outstanding - 228 and 225 shares, respectively 5 wdc_CommonStockValues wdc false credit instant monetary Dollar value of issued common stock whether issued at par value, no par or stated value. Note: elements for number of common... false false false false false false false false false 1 false true 2000000 2 false false 2 false true 2000000 2 false false Dollar value of issued common stock whether issued at par value, no par or stated value. Note: elements for number of common shares, par value and other disclosure concepts are in another section within stockholders' equity. No authoritative reference available. false 31 Additional paid-in capital 5 us-gaap_AdditionalPaidInCapital us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 976000000 976 false false 2 false true 896000000 896 false false No definition available. No authoritative reference available. false 32 Accumulated other comprehensive income 5 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 4000000 4 false false 2 false true 2000000 2 false false No definition available. No authoritative reference available. false 33 Retained earnings 5 us-gaap_RetainedEarningsAccumulatedDeficit us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 3009000000 3009 false false 2 false true 2292000000 2292 false false No definition available. No authoritative reference available. true 34 Total shareholders' equity 5 us-gaap_StockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 false true 3991000000 3991 false false 2 false true 3192000000 3192 false false No definition available. No authoritative reference available. true 35 Total liabilities and shareholders' equity 4 us-gaap_LiabilitiesAndStockholdersEquity us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 true true 6585000000 6585 false false 2 true true 5291000000 5291 false false No definition available. No authoritative reference available. true false 2 28 false Millions UnKnown UnKnown false true