1.0.0.3 false Condensed Consolidated Statements of Cash Flows (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 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 5 Cash flows from operating activities 3 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract 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 6 Net income 4 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 717000000 717 false false 2 true true 225000000 225 false false No definition available. No authoritative reference available. false 7 Adjustments to reconcile net income to net cash provided by operations: 4 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract 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 8 Depreciation and amortization 5 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 247000000 247 false false 2 false true 239000000 239 false false No definition available. No authoritative reference available. false 9 Stock-based compensation 5 us-gaap_ShareBasedCompensation us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 27000000 27 false false 2 false true 21000000 21 false false No definition available. No authoritative reference available. false 10 Deferred income taxes 5 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -5000000 -5 false false 2 false true -7000000 -7 false false No definition available. No authoritative reference available. false 11 Loss on investments 5 wdc_LossOnInvestments wdc false credit duration monetary The difference between the carrying value and the sale price of debt securities includes other than temporary impairment on... false false false false false false false false false 1 false true 0 0 false false 2 false true 9000000 9 false false The difference between the carrying value and the sale price of debt securities includes other than temporary impairment on auction-rate securities. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. No authoritative reference available. false 12 Non-cash portion of restructuring 5 us-gaap_RestructuringCosts 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 80000000 80 false false No definition available. No authoritative reference available. false 13 Changes in: 5 us-gaap_IncreaseDecreaseInOperatingCapitalAbstract 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 14 Accounts receivable, net 6 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -439000000 -439 false false 2 false true 84000000 84 false false No definition available. No authoritative reference available. false 15 Inventories 6 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -77000000 -77 false false 2 false true 10000000 10 false false No definition available. No authoritative reference available. false 16 Accounts payable 6 us-gaap_IncreaseDecreaseInAccountsPayableTrade us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 428000000 428 false false 2 false true -63000000 -63 false false No definition available. No authoritative reference available. false 17 Accrued expenses 6 us-gaap_IncreaseDecreaseInAccruedLiabilities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 57000000 57 false false 2 false true 11000000 11 false false No definition available. No authoritative reference available. false 18 Other assets and liabilities 6 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 36000000 36 false false 2 false true -8000000 -8 false false No definition available. No authoritative reference available. true 19 Net cash provided by operating activities 4 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 991000000 991 false false 2 false true 601000000 601 false false No definition available. No authoritative reference available. true 20 Cash flows from investing activities 3 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract 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 21 Purchases of property and equipment 4 us-gaap_PaymentsToAcquireProductiveAssets us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -375000000 -375 false false 2 false true -302000000 -302 false false No definition available. No authoritative reference available. false 22 Sales and maturities of investments 4 us-gaap_PaymentsForProceedsFromInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 3000000 3 false false 2 false true 1000000 1 false false No definition available. No authoritative reference available. true 23 Net cash used in investing activities 4 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -372000000 -372 false false 2 false true -301000000 -301 false false No definition available. No authoritative reference available. true 24 Cash flows from financing activities 3 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract 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 25 Issuance of stock under employee stock plans 4 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 47000000 47 false false 2 false true 12000000 12 false false No definition available. No authoritative reference available. false 26 Taxes paid on vested stock awards under employee stock plans 4 wdc_TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans wdc false debit duration monetary Taxes paid on vested stock awards under employee stock plans. false false false false false false false false false 1 false true -7000000 -7 false false 2 false true -3000000 -3 false false Taxes paid on vested stock awards under employee stock plans. No authoritative reference available. false 27 Increase in excess tax benefits from employee stock plans 4 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 20000000 20 false false 2 false true 4000000 4 false false No definition available. No authoritative reference available. false 28 Repurchases of common stock 4 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -36000000 -36 false false No definition available. No authoritative reference available. false 29 Repayment of debt 4 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -38000000 -38 false false 2 false true -5000000 -5 false false No definition available. No authoritative reference available. true 30 Net cash provided by (used in) financing activities 4 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 22000000 22 false false 2 false true -28000000 -28 false false No definition available. No authoritative reference available. true 31 Net increase in cash and cash equivalents 3 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 641000000 641 false false 2 false true 272000000 272 false false No definition available. No authoritative reference available. false 32 Cash and cash equivalents, beginning of period 3 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 1794000000 1794 false false 2 false true 1104000000 1104 false false No definition available. No authoritative reference available. false 33 Cash and cash equivalents, end of period 3 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 2435000000 2435 false false 2 false true 1376000000 1376 false false No definition available. No authoritative reference available. false 34 Supplemental disclosure of cash flow information: 3 us-gaap_SupplementalCashFlowInformationAbstract 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 35 Cash paid for income taxes 4 us-gaap_IncomeTaxesPaid 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 7000000 7 false false No definition available. No authoritative reference available. false 36 Cash paid for interest 4 us-gaap_InterestPaid us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 2000000 2 false false 2 true true 4000000 4 false false No definition available. No authoritative reference available. false false 2 32 false Millions UnKnown UnKnown false true