1.0.0.3 false Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data 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 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 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 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 3 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 false 4 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 5 Revenue, net 3 us-gaap_SalesRevenueGoodsNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 2619000000 2619 false false 2 true true 1823000000 1823 false false 3 true true 4827000000 4827 false false 4 true true 3933000000 3933 false false No definition available. No authoritative reference available. false 6 Cost of revenue 3 us-gaap_CostOfGoodsSold us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1932000000 1932 false false 2 false true 1533000000 1533 false false 3 false true 3626000000 3626 false false 4 false true 3219000000 3219 false false No definition available. No authoritative reference available. true 7 Gross margin 3 us-gaap_GrossProfit us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 687000000 687 false false 2 false true 290000000 290 false false 3 false true 1201000000 1201 false false 4 false true 714000000 714 false false No definition available. No authoritative reference available. true 8 Operating expenses: 3 us-gaap_OperatingExpensesAbstract 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 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 9 Research and development 4 us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 154000000 154 false false 2 false true 119000000 119 false false 3 false true 296000000 296 false false 4 false true 252000000 252 false false No definition available. No authoritative reference available. false 10 Selling, general and administrative 4 wdc_SellingGeneralAndAdministrativeExpenseOperatingExpenses wdc false debit duration monetary The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative... false false false false false false false false false 1 false true 60000000 60 false false 2 false true 42000000 42 false false 3 false true 113000000 113 false false 4 false true 99000000 99 false false The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. No authoritative reference available. false 11 Restructuring 4 us-gaap_RestructuringCharges us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true 113000000 113 false false 3 false true 0 0 false false 4 false true 113000000 113 false false No definition available. No authoritative reference available. true 12 Total operating expenses 4 us-gaap_OperatingExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 214000000 214 false false 2 false true 274000000 274 false false 3 false true 409000000 409 false false 4 false true 464000000 464 false false No definition available. No authoritative reference available. true 13 Operating income 3 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 473000000 473 false false 2 false true 16000000 16 false false 3 false true 792000000 792 false false 4 false true 250000000 250 false false No definition available. No authoritative reference available. false 14 Other income (expense): 3 us-gaap_NonoperatingIncomeExpenseAbstract 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 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 15 Interest income 4 us-gaap_InvestmentIncomeInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 1000000 1 false false 2 false true 2000000 2 false false 3 false true 2000000 2 false false 4 false true 6000000 6 false false No definition available. No authoritative reference available. false 16 Interest and other expense 4 wdc_InterestAndOtherExpense wdc false credit duration monetary Expense for borrowed money and other non-operating activities. false false false false false false false false false 1 false true -3000000 -3 false false 2 false true -11000000 -11 false false 3 false true -6000000 -6 false false 4 false true -19000000 -19 false false Expense for borrowed money and other non-operating activities. No authoritative reference available. true 17 Total other expense, net 4 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -2000000 -2 false false 2 false true -9000000 -9 false false 3 false true -4000000 -4 false false 4 false true -13000000 -13 false false No definition available. No authoritative reference available. true 18 Income before income taxes 3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 471000000 471 false false 2 false true 7000000 7 false false 3 false true 788000000 788 false false 4 false true 237000000 237 false false No definition available. No authoritative reference available. false 19 Income tax provision (benefit) 3 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 42000000 42 false false 2 false true -7000000 -7 false false 3 false true 71000000 71 false false 4 false true 12000000 12 false false No definition available. No authoritative reference available. true 20 Net income 3 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 429000000 429 false false 2 true true 14000000 14 false false 3 true true 717000000 717 false false 4 true true 225000000 225 false false No definition available. No authoritative reference available. true 21 Income per common share: 3 us-gaap_EarningsPerShareAbstract 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 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 22 Basic 4 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 1.89 1.89 false false 2 true true 0.06 0.06 false false 3 true true 3.17 3.17 false false 4 true true 1.01 1.01 false false No definition available. No authoritative reference available. true 23 Diluted 4 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 1.85 1.85 false false 2 true true 0.06 0.06 false false 3 true true 3.1 3.1 false false 4 true true 1 1 false false No definition available. No authoritative reference available. true 24 Weighted average shares outstanding: 3 us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract 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 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 25 Basic 4 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 227000000 227 false false 2 false true 222000000 222 false false 3 false true 226000000 226 false false 4 false true 222000000 222 false false No definition available. No authoritative reference available. true 26 Diluted 4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 232000000 232 false false 2 false true 224000000 224 false false 3 false true 231000000 231 false false 4 false true 225000000 225 false false No definition available. No authoritative reference available. true false 4 22 false Millions Millions Hundreds false true