$WDC
WESTERN DIGITAL CORP Stock $wdc

$wdc Overview Financials Valuation SEC Filings Company Website

2019 Q3 Form 10-K Financial Statement

#000010604019000058 Filed on August 27, 2019

Income Statement

Concept	2019 Q3	2019 Q2	2018 Q2
Revenue		$3.634B	$5.117B
YoY Change		-28.98%	5.68%
Cost Of Revenue		$3.169B	$3.265B
YoY Change		-2.94%	3.29%
Gross Profit		$465.0M	$1.852B
YoY Change		-74.89%	10.17%
Gross Profit Margin		12.8%	36.19%
Selling, General & Admin		$299.0M	$352.0M
YoY Change		-15.06%	2.03%
% of Gross Profit		64.3%	19.01%
Research & Development		$523.0M	$577.0M
YoY Change		-9.36%	-4.47%
% of Gross Profit		112.47%	31.16%
Depreciation & Amortization		$416.0M	$489.0M
YoY Change		-14.93%	-10.44%
% of Gross Profit		89.46%	26.4%
Operating Expenses		$822.0M	$929.0M
YoY Change		-11.52%	-2.11%
Operating Profit		-$381.0M	$843.0M
YoY Change		-145.2%	29.29%
Interest Expense		-$103.0M	-$100.0M
YoY Change		3.0%	-47.92%
% of Operating Profit			-11.86%
Other Income/Expense, Net		$10.00M	-$14.00M
YoY Change		-171.43%	-68.89%
Pretax Income		-$474.0M	$729.0M
YoY Change		-165.02%	75.66%
Income Tax		-$289.0M	$49.00M
% Of Pretax Income			6.72%
Net Earnings		-$197.0M	$756.0M
YoY Change		-126.06%	170.0%
Net Earnings / Revenue		-5.42%	14.77%
Basic Earnings Per Share		-$0.67	$2.53
Diluted Earnings Per Share		-$0.67	$2.46
COMMON SHARES
Basic Shares Outstanding	296.0M shares	293.0M shares	299.2M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2019 Q2	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.455B	$5.028B
YoY Change	-31.28%	-21.17%
Cash & Equivalents	$3.455B	$5.005B
Short-Term Investments	$0.00	$23.00M
Other Short-Term Assets	$535.0M	$492.0M
YoY Change	8.74%	19.13%
Inventory	$3.283B	$2.944B
Prepaid Expenses
Receivables	$1.200B	$2.197B
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$8.477B	$10.64B
YoY Change	-20.31%	-3.78%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.843B	$3.095B
YoY Change	-8.14%	2.04%
Goodwill	$10.08B	$10.08B
YoY Change	0.01%	0.61%
Intangibles	$1.711B	$2.680B
YoY Change	-36.16%	-29.9%
Long-Term Investments	$0.00	$93.00M
YoY Change	-100.0%
Other Assets	$472.0M	$642.0M
YoY Change	-26.48%	8.08%
Total Long-Term Assets	$17.89B	$18.60B
YoY Change	-3.79%	-1.1%
TOTAL ASSETS
Total Short-Term Assets	$8.477B	$10.64B
Total Long-Term Assets	$17.89B	$18.60B
Total Assets	$26.37B	$29.24B
YoY Change	-9.8%	-2.09%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.567B	$2.265B
YoY Change	-30.82%	5.64%
Accrued Expenses	$1.296B	$1.274B
YoY Change	1.73%	1.51%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$276.0M	$179.0M
YoY Change	54.19%	-23.18%
Total Short-Term Liabilities	$3.817B	$4.456B
YoY Change	-14.34%	2.58%
LONG-TERM LIABILITIES
Long-Term Debt	$10.25B	$10.99B
YoY Change	-6.8%	-14.9%
Other Long-Term Liabilities	$2.340B	$2.255B
YoY Change	3.77%	91.1%
Total Long-Term Liabilities	$12.59B	$13.25B
YoY Change	-5.0%	-6.03%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.817B	$4.456B
Total Long-Term Liabilities	$12.59B	$13.25B
Total Liabilities	$16.40B	$17.70B
YoY Change	-7.35%	-4.0%
SHAREHOLDERS EQUITY
Retained Earnings	$7.449B	$8.757B
YoY Change	-14.94%	1.44%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.268B	$1.444B
YoY Change	-12.19%	-13.33%
Treasury Stock Shares	17.00M shares	16.00M shares
Shareholders Equity	$9.967B	$11.53B
YoY Change
Total Liabilities & Shareholders Equity	$26.37B	$29.24B
YoY Change	-9.8%	-2.09%

Cashflow Statement

Concept	2019 Q2	2018 Q2
OPERATING ACTIVITIES
Net Income	-$197.0M	$756.0M
YoY Change	-126.06%	170.0%
Depreciation, Depletion And Amortization	$416.0M	$489.0M
YoY Change	-14.93%	-10.44%
Cash From Operating Activities	$169.0M	$863.0M
YoY Change	-80.42%	-8.09%
INVESTING ACTIVITIES
Capital Expenditures	-$154.0M	-$192.0M
YoY Change	-19.79%	53.6%
Acquisitions
YoY Change
Other Investing Activities	-$76.00M	-$57.00M
YoY Change	33.33%	-12.31%
Cash From Investing Activities	-$230.0M	-$249.0M
YoY Change	-7.63%	31.05%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-172.0M	-563.0M
YoY Change	-69.45%	1048.98%
NET CHANGE
Cash From Operating Activities	169.0M	863.0M
Cash From Investing Activities	-230.0M	-249.0M
Cash From Financing Activities	-172.0M	-563.0M
Net Change In Cash	-233.0M	51.00M
YoY Change	-556.86%	-92.71%
FREE CASH FLOW
Cash From Operating Activities	$169.0M	$863.0M
Capital Expenditures	-$154.0M	-$192.0M
Free Cash Flow	$323.0M	$1.055B
YoY Change	-69.38%	-0.85%

Facts In Submission

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CY2019Q2	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	295000000	shares
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CY2019	dei	Entity File Number EntityFileNumber	1-8703
CY2019	dei	Entity Registrant Name EntityRegistrantName	WESTERN DIGITAL CORP
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	33-0956711
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	5601 Great Oaks Parkway
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	San Jose,
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
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CY2019	dei	City Area Code CityAreaCode	408
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CY2019	dei	Security12b Title Security12bTitle	Common Stock, $.01 Par Value Per Share
CY2019	dei	Trading Symbol TradingSymbol	WDC
CY2019	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	18000000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-115000000	USD
CY2019	wdc	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period And Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodAndAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	-39000000	USD
CY2018	wdc	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period And Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodAndAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	7000000	USD
	wdc	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period And Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodAndAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	-75000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-50000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	23000000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-151000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-21000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	4000000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	10000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-29000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	19000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-161000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-783000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	694000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	236000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-754000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	675000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	397000000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1812000000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	2056000000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	2128000000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	306000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	377000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	394000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	374000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-348000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12000000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-39000000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-21000000	USD
	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-18000000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	38000000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	221000000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	285000000	USD
CY2019	wdc	Cash Premium On Extinguishment Of Debt CashPremiumOnExtinguishmentOfDebt	0	USD
CY2018	wdc	Cash Premium On Extinguishment Of Debt CashPremiumOnExtinguishmentOfDebt	-720000000	USD
	wdc	Cash Premium On Extinguishment Of Debt CashPremiumOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	26000000	USD
	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	21000000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-135000000	USD
CY2019	wdc	Convertibledebtactivitynet Convertibledebtactivitynet	0	USD
CY2018	wdc	Convertibledebtactivitynet Convertibledebtactivitynet	0	USD
	wdc	Convertibledebtactivitynet Convertibledebtactivitynet	5000000	USD
CY2019	wdc	Non Cash Portion Of Employee Termination Benefits And Other Charges NonCashPortionOfEmployeeTerminationBenefitsAndOtherCharges	0	USD
CY2018	wdc	Non Cash Portion Of Employee Termination Benefits And Other Charges NonCashPortionOfEmployeeTerminationBenefitsAndOtherCharges	16000000	USD
	wdc	Non Cash Portion Of Employee Termination Benefits And Other Charges NonCashPortionOfEmployeeTerminationBenefitsAndOtherCharges	13000000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-8000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-19000000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	94000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-993000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	244000000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	487000000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	339000000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	598000000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	204000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-588000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-15000000	USD
	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	223000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Related Parties IncreaseDecreaseInAccountsPayableRelatedParties	72000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable Related Parties IncreaseDecreaseInAccountsPayableRelatedParties	53000000	USD
	us-gaap	Increase Decrease In Accounts Payable Related Parties IncreaseDecreaseInAccountsPayableRelatedParties	38000000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-42000000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-17000000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	231000000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-26000000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	115000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	221000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-1333000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-175000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1547000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4205000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3437000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	876000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	835000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	578000000	USD
CY2019	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	119000000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-18000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	32000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1272000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1655000000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	79000000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	89000000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	281000000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	175000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	48000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	94000000	USD
CY2019	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	7000000	USD
CY2018	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	19000000	USD
	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	417000000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	20000000	USD
CY2019	wdc	Payments For Long Term Loans For Related Parties PaymentsForLongTermLoansForRelatedParties	1364000000	USD
CY2018	wdc	Payments For Long Term Loans For Related Parties PaymentsForLongTermLoansForRelatedParties	1313000000	USD
	wdc	Payments For Long Term Loans For Related Parties PaymentsForLongTermLoansForRelatedParties	549000000	USD
CY2019	wdc	Proceeds From Long Term Loans For Related Parties ProceedsFromLongTermLoansForRelatedParties	766000000	USD
CY2018	wdc	Proceeds From Long Term Loans For Related Parties ProceedsFromLongTermLoansForRelatedParties	571000000	USD
	wdc	Proceeds From Long Term Loans For Related Parties ProceedsFromLongTermLoansForRelatedParties	292000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	20000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-636000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	118000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	220000000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	235000000	USD
CY2019	wdc	Taxes Paid On Vested Stock Awards Under Employee Stock Plans TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans	115000000	USD
CY2018	wdc	Taxes Paid On Vested Stock Awards Under Employee Stock Plans TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans	171000000	USD
	wdc	Taxes Paid On Vested Stock Awards Under Employee Stock Plans TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans	124000000	USD
CY2019	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2018	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	119000000	USD
CY2019	wdc	Net Cash Received In Settlement Of Paid In Advance For Stock Repurchase Contracts NetCashReceivedInSettlementOfPaidInAdvanceForStockRepurchaseContracts	0	USD
CY2018	wdc	Net Cash Received In Settlement Of Paid In Advance For Stock Repurchase Contracts NetCashReceivedInSettlementOfPaidInAdvanceForStockRepurchaseContracts	0	USD
	wdc	Net Cash Received In Settlement Of Paid In Advance For Stock Repurchase Contracts NetCashReceivedInSettlementOfPaidInAdvanceForStockRepurchaseContracts	61000000	USD
CY2019	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	0	USD
CY2018	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	0	USD
	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	492000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	563000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	591000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	584000000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	593000000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	574000000	USD
CY2019	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	-28000000	USD
	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	21000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-500000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	500000000	USD
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	0	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	181000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	17074000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	11697000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	13840000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	7908000000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	59000000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	10000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1829000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3900000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4595000000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4000000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1000000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-3000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1550000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1349000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1797000000	USD
CY2018Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5005000000	USD
CY2017Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6354000000	USD
CY2016Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	8151000000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3455000000	USD
CY2018Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5005000000	USD
CY2017Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6354000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	377000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	220000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	184000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	431000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	708000000	USD
	us-gaap	Interest Paid Net InterestPaidNet	777000000	USD
CY2017Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	51000000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	49000000	USD
CY2017	wdc	Convertible Note Hedge Amount ConvertibleNoteHedgeAmount	11000000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	377000000	USD
	wdc	Dividends Declared DividendsDeclared	577000000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	125000000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	591000000	USD
CY2019	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	0	USD
CY2018	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	0	USD
	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	16000000	USD
CY2019	wdc	Convertible Note Hedge Amount ConvertibleNoteHedgeAmount	0	USD
CY2018	wdc	Convertible Note Hedge Amount ConvertibleNoteHedgeAmount	0	USD
	wdc	Convertible Note Hedge Amount ConvertibleNoteHedgeAmount	11000000	USD
CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	11145000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	397000000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	111000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	394000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	104000000	USD
CY2017	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	16000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-27000000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-113000000	USD
	wdc	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period And Available For Sale Securities Adjustment Before Reclassification Adjustments Netof Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodAndAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetofTax	-75000000	USD
CY2017Q2	us-gaap	Stockholders Equity StockholdersEquity	11418000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	675000000	USD
CY2018	wdc	Dividends Declared DividendsDeclared	592000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1000000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	18000000	USD
CY2018	wdc	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period And Available For Sale Securities Adjustment Before Reclassification Adjustments Netof Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodAndAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetofTax	2000000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	11531000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-754000000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3000000	USD
CY2018Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	56000000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	306000000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	563000000	USD
CY2019	wdc	Dividends Declared DividendsDeclared	583000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	34000000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	25000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-20000000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	9967000000	USD
CY2019	us-gaap	Fiscal Period FiscalPeriod	<div style="line-height:120%;text-indent:12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Fiscal Year</span></div><div style="line-height:120%;text-indent:12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company’s fiscal year ends on the Friday nearest to June 30 and typically consists of </span><span style="font-family:inherit;font-size:10pt;">52</span><span style="font-family:inherit;font-size:10pt;"> weeks. Approximately every five to six years, the Company reports a 53-week fiscal year to align the fiscal year with the foregoing policy. Fiscal years </span><span style="font-family:inherit;font-size:10pt;">2019</span><span style="font-family:inherit;font-size:10pt;">, which ended on </span><span style="font-family:inherit;font-size:10pt;">June 28, 2019</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;">, which ended on </span><span style="font-family:inherit;font-size:10pt;">June 29, 2018</span><span style="font-family:inherit;font-size:10pt;">, and </span><span style="font-family:inherit;font-size:10pt;">2017</span><span style="font-family:inherit;font-size:10pt;">, which ended on </span><span style="font-family:inherit;font-size:10pt;">June 30, 2017</span><span style="font-family:inherit;font-size:10pt;">, are each comprised of </span><span style="font-family:inherit;font-size:10pt;">52</span><span style="font-family:inherit;font-size:10pt;"> weeks, with all quarters presented consisting of </span><span style="font-family:inherit;font-size:10pt;">13</span><span style="font-family:inherit;font-size:10pt;"> weeks. Fiscal year </span><span style="font-family:inherit;font-size:10pt;">2020</span><span style="font-family:inherit;font-size:10pt;">, which ends on </span><span style="font-family:inherit;font-size:10pt;">July 3, 2020</span><span style="font-family:inherit;font-size:10pt;">, will be comprised of </span><span style="font-family:inherit;font-size:10pt;">53</span><span style="font-family:inherit;font-size:10pt;"> weeks, with the first quarter consisting of </span><span style="font-family:inherit;font-size:10pt;">14</span><span style="font-family:inherit;font-size:10pt;"> weeks and the remaining quarters consisting of </span><span style="font-family:inherit;font-size:10pt;">13</span><span style="font-family:inherit;font-size:10pt;"> weeks each.</span></div>
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-indent:12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</span></div><div style="line-height:120%;text-indent:12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Company management has made estimates and assumptions relating to the reporting of certain assets and liabilities in conformity with U.S. GAAP. These estimates and assumptions have been applied using methodologies that are consistent throughout the periods presented. However, actual results could differ materially from these estimates.</span></div>
CY2019Q2	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	43000000	USD
CY2018Q2	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	120000000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	104000000	USD
CY2019Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	191000000	USD
CY2019Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	65000000	USD
CY2019Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	48000000	USD
CY2019Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	44000000	USD
CY2019Q2	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	34000000	USD
CY2018Q2	us-gaap	Inventory Net InventoryNet	2944000000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	107000000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	112000000	USD
	us-gaap	Advertising Expense AdvertisingExpense	89000000	USD
CY2019Q2	invest	Derivative Notional Amount DerivativeNotionalAmount	5710000000	USD
CY2018Q2	invest	Derivative Notional Amount DerivativeNotionalAmount	4370000000	USD
CY2016Q3	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	279000000	USD
CY2019Q2	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	968000000	USD
CY2019	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	162000000	USD
CY2018Q2	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	878000000	USD
CY2019Q2	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	1173000000	USD
CY2018	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	176000000	USD
	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	177000000	USD
CY2018Q2	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	1018000000	USD
CY2019Q2	us-gaap	Inventory Net InventoryNet	3283000000	USD
CY2019	us-gaap	Proceeds From Sale And Collection Of Receivables ProceedsFromSaleAndCollectionOfReceivables	1020000000.00	USD
CY2018	us-gaap	Proceeds From Sale And Collection Of Receivables ProceedsFromSaleAndCollectionOfReceivables	57000000	USD
CY2019Q2	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	1142000000	USD
CY2018Q2	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	1048000000	USD
CY2019Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10003000000	USD
CY2018Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10186000000	USD
CY2019Q2	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7160000000	USD
CY2018Q2	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7091000000	USD
CY2019Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2843000000	USD
CY2018Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3095000000	USD
CY2019	us-gaap	Depreciation Depreciation	844000000	USD
CY2018	us-gaap	Depreciation Depreciation	871000000	USD
	us-gaap	Depreciation Depreciation	960000000	USD
CY2018Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	318000000	USD
CY2017Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	311000000	USD
CY2019	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	142000000	USD
CY2018	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	151000000	USD
CY2019Q2	us-gaap	Standard Product Warranty Accrual Current StandardProductWarrantyAccrualCurrent	188000000	USD
CY2018Q2	us-gaap	Standard Product Warranty Accrual Current StandardProductWarrantyAccrualCurrent	168000000	USD
CY2019Q2	us-gaap	Standard Product Warranty Accrual Noncurrent StandardProductWarrantyAccrualNoncurrent	162000000	USD
CY2019Q2	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	0	USD
CY2018Q2	us-gaap	Standard Product Warranty Accrual Noncurrent StandardProductWarrantyAccrualNoncurrent	150000000	USD
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	151000000	USD
CY2019	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	12000000	USD
CY2018	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	-18000000	USD
	us-gaap	Standard Product Warranty Accrual Preexisting Increase Decrease StandardProductWarrantyAccrualPreexistingIncreaseDecrease	6000000	USD
CY2019Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	350000000	USD
CY2018Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	318000000	USD
CY2017Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	311000000	USD
CY2019Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	350000000	USD
CY2018Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	318000000	USD
CY2019Q2	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	928000000	USD
CY2018Q2	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	1315000000	USD
CY2019Q2	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	699000000	USD
CY2018Q2	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	508000000	USD
CY2019Q2	wdc	Other Miscellanious Liabilities Noncurrent OtherMiscellaniousLiabilitiesNoncurrent	713000000	USD
CY2018Q2	wdc	Other Miscellanious Liabilities Noncurrent OtherMiscellaniousLiabilitiesNoncurrent	432000000	USD
CY2019Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2340000000	USD
CY2018Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2255000000	USD
CY2019Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3455000000	USD
CY2018Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5005000000	USD
CY2018Q2	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	23000000	USD
CY2019Q2	wdc	Total Cash And Cash Equivalents And Debt Securities Availableforsale TotalCashAndCashEquivalentsAndDebtSecuritiesAvailableforsale	3455000000	USD
CY2019Q2	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	0	USD
CY2018Q2	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	93000000	USD
CY2019Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	276000000	USD
CY2019Q2	us-gaap	Foreign Currency Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months	-54000000	USD
CY2018Q2	wdc	Total Cash And Cash Equivalents And Debt Securities Availableforsale TotalCashAndCashEquivalentsAndDebtSecuritiesAvailableforsale	5121000000	USD
CY2019Q2	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	10694000000	USD
CY2018Q2	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	11375000000	USD
CY2019Q2	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	172000000	USD
CY2018Q2	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	203000000	USD
CY2019Q2	us-gaap	Long Term Debt LongTermDebt	10522000000	USD
CY2018Q2	us-gaap	Long Term Debt LongTermDebt	11172000000	USD
CY2019Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	276000000	USD
CY2018Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	179000000	USD
CY2019Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	10246000000	USD
CY2018Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	10993000000	USD
CY2019Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	276000000	USD
CY2019Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	311000000	USD
CY2019Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	6431000000	USD
CY2019Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1100000000	USD
CY2019Q2	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	2300000000	USD
CY2019Q2	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	10694000000	USD
CY2019Q2	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	172000000	USD
CY2019Q2	us-gaap	Long Term Debt LongTermDebt	10522000000	USD
CY2017Q2	us-gaap	Goodwill Goodwill	10014000000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	61000000	USD
CY2018Q2	us-gaap	Goodwill Goodwill	10075000000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-1000000	USD
CY2019Q2	us-gaap	Goodwill Goodwill	10076000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	5824000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4185000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1639000000	USD
CY2019Q2	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	5896000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4185000000	USD
CY2019Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1711000000	USD
CY2018Q2	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	5818000000	USD
CY2018Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	3218000000	USD
CY2018Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2600000000	USD
CY2018Q2	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	5898000000	USD
CY2018Q2	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	3218000000	USD
CY2018Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2680000000	USD
CY2019	wdc	Finite Lived Intangible Assets Transferred In From Out To Indefinite Lived Intangible Assets FiniteLivedIntangibleAssetsTransferredInFromOutToIndefiniteLivedIntangibleAssets	8000000	USD
CY2019	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	968000000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1185000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1169000000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	33000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	758000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	503000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	226000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	134000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	18000000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1639000000	USD
CY2019Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	208000000	USD
CY2018Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	200000000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	22000000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	16000000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	116000000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	291000000	USD
CY2019Q2	us-gaap	Retained Earnings Undistributed Earnings From Equity Method Investees RetainedEarningsUndistributedEarningsFromEquityMethodInvestees	14000000	USD
CY2018Q2	us-gaap	Retained Earnings Undistributed Earnings From Equity Method Investees RetainedEarningsUndistributedEarningsFromEquityMethodInvestees	8000000	USD
CY2019Q2	wdc	Investment Funding Commitments InvestmentFundingCommitments	0.50
CY2019	wdc	Costs Associated With Underutilized Capacity As A Result Of A Temporary Abnormal Reduction In Production CostsAssociatedWithUnderutilizedCapacityAsAResultOfATemporaryAbnormalReductionInProduction	264000000	USD
CY2019Q2	us-gaap	Purchase Obligation PurchaseObligation	1047000000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	59000000	USD
CY2019Q2	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	45000000	USD
CY2017Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	58.14
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	16569000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	19093000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20647000000	USD
CY2019Q2	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	244000000	USD
CY2019Q2	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	263000000	USD
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	2200000	shares
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	44.52
CY2019Q2	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	154000000	USD
CY2019Q2	us-gaap	Purchase Obligation Due In Fifth Year PurchaseObligationDueInFifthYear	40000000	USD
CY2019Q2	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	210000000	USD
CY2019	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	47000000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	49000000	USD
	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	56000000	USD
CY2019Q2	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	136000000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	16569000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20647000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	19093000000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	16569000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20647000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	19093000000	USD
CY2019Q2	us-gaap	Noncurrent Assets NoncurrentAssets	2843000000	USD
CY2018Q2	us-gaap	Noncurrent Assets NoncurrentAssets	3095000000	USD
CY2019Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1200000000	USD
CY2018Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2200000000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	99000000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	400000	shares
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	88700000	shares
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	2800000	shares
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	44.83
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	3500000	shares
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	34000000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	35000000	USD
	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	36000000	USD
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	37.72
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	120000000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	60.85
CY2018Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4800000	shares
CY2018Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	64.23
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	400000	shares
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	306000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	377000000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	394000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	306000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	377000000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	394000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	50000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	66000000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	105000000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	256000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	311000000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	289000000	USD
CY2019Q2	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	557000000	USD
CY2016Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	9000000.0	shares
CY2016Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	55.74
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	39.58
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	8000000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	500000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	74.79
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	3900000	shares
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	65.72
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	8000000	USD
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	3300000	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	900000	shares
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	68.97
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	71.31
CY2017Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7400000	shares
CY2019Q2	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	6000000	USD
CY2019Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	45000000	shares
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.00
CY2019	wdc	Dividends Declared DividendsDeclared	583000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	147000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-642000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	2398000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	560000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	355000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-313000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	209000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-287000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2085000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	769000000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7000000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-9000000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	374000000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	181000000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	166000000	USD
	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	127000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-91000000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1597000000	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	229000000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3000000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-5000000	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4000000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	93000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1758000000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	360000000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	226000000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-39000000	USD
	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	56000000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	141000000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-300000000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-44000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-348000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	467000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1410000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	372000000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	wdc	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit Incomplete Accounting Provisional Amount TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefitIncompleteAccountingProvisionalAmount	-65000000	USD
CY2019Q2	us-gaap	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit	5000000	USD
CY2018Q2	wdc	Deferred Tax Liabilities Projected Effective Rate At Which Position Will Reverse DeferredTaxLiabilitiesProjectedEffectiveRateAtWhichPositionWillReverse	0.22
CY2018	wdc	Tax Cutsand Jobs Actof2017 Transition Taxfor Accumulated Foreign Earnings Liability Incomplete Accounting Provisional Amount TaxCutsandJobsActof2017TransitionTaxforAccumulatedForeignEarningsLiabilityIncompleteAccountingProvisionalAmount	1570000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiability	-302000000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.28
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability Utilization Of Existing Operating Losses TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiabilityUtilizationOfExistingOperatingLosses	-95000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability Utilization Of Deferred Tax Asset TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiabilityUtilizationOfDeferredTaxAsset	-250000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability Utilization Of Existing Operating Losses TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiabilityUtilizationOfExistingOperatingLosses	-52000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability Utilization Of Existing Operating Losses TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiabilityUtilizationOfExistingOperatingLosses	-52000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiability	-105000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability Utilization Of Deferred Tax Asset TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiabilityUtilizationOfDeferredTaxAsset	-41000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability Utilization Of Deferred Tax Asset Income Tax Expense Benefit TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiabilityUtilizationOfDeferredTaxAssetIncomeTaxExpenseBenefit	-19000000	USD
	wdc	Tax Cuts And Jobs Act Of2017 Measurement Period Adjustment Transition Tax For Accumulated Foreign Earnings Liability Favorable Final Regulation TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentTransitionTaxForAccumulatedForeignEarningsLiabilityFavorableFinalRegulation	64000000	USD
CY2018Q2	us-gaap	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Liability TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability	1250000000	USD
CY2018Q2	wdc	Tax Cuts And Jobs Act Of2017 Unrecognized Tax Benefits TaxCutsAndJobsActOf2017UnrecognizedTaxBenefits	146000000	USD
CY2018Q4	wdc	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Income Tax Expense Benefit Incomplete Accounting Provisional Amount TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsIncomeTaxExpenseBenefitIncompleteAccountingProvisionalAmount	253000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	55000000	USD
CY2018Q4	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-21000000	USD
CY2019Q2	wdc	Tax Cuts And Jobs Act Of2017 Transition Tax For Accumulated Foreign Earnings Income Tax Expense Benefit Incomplete Accounting Provisional Amount TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsIncomeTaxExpenseBenefitIncompleteAccountingProvisionalAmount	1250000000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	48000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	53000000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	124000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	145000000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	285000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	443000000	USD
CY2019Q2	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	410000000	USD
CY2018Q2	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	448000000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	144000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	161000000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	135000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	118000000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1146000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1368000000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	413000000	USD
CY2018Q2	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	491000000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	220000000	USD
CY2018Q2	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	5000000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	32000000	USD
CY2018Q2	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	43000000	USD
CY2019Q2	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	665000000	USD
CY2018Q2	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	539000000	USD
CY2019Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	619000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	614000000	USD
CY2019Q2	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	138000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	215000000	USD
CY2019Q2	wdc	Operating Loss And Tax Credit Carryforwards Amount OperatingLossAndTaxCreditCarryforwardsAmount	250000000	USD
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CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.01
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.01
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CY2019	wdc	Deferred Tax Liability Increase Decrease Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityIncreaseDecreaseUndistributedEarningsOfForeignSubsidiaries	228000000	USD
CY2019	wdc	Deferred Tax Liability Increase Decrease Purchase Accounting Intangibles DeferredTaxLiabilityIncreaseDecreasePurchaseAccountingIntangibles	-78000000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	5000000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.03
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.01
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.01
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0
	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.04
CY2019	wdc	Effective Income Tax Rate Reconciliation Foreign Minimum Tax Percent EffectiveIncomeTaxRateReconciliationForeignMinimumTaxPercent	-0.38
CY2018	wdc	Effective Income Tax Rate Reconciliation Foreign Minimum Tax Percent EffectiveIncomeTaxRateReconciliationForeignMinimumTaxPercent	0
	wdc	Effective Income Tax Rate Reconciliation Foreign Minimum Tax Percent EffectiveIncomeTaxRateReconciliationForeignMinimumTaxPercent	0
CY2019	wdc	Effective Income Tax Rate Reconciliation Foreign Derived Intangible Income Percent EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent	0.11
CY2018	wdc	Effective Income Tax Rate Reconciliation Foreign Derived Intangible Income Percent EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomePercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	-0.23
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	96000000	USD
CY2018Q2	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	54000000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.28
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.75
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.34
	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.27
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	-0.07
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.01
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.01
CY2019	wdc	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Mandatory Deemed Reparation Tax Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017MandatoryDeemedReparationTaxPercent	-0.41
CY2018	wdc	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Mandatory Deemed Reparation Tax Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017MandatoryDeemedReparationTaxPercent	0.75
	wdc	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Mandatory Deemed Reparation Tax Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017MandatoryDeemedReparationTaxPercent	0
CY2019	wdc	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Changein Tax Rate Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017ChangeinTaxRateDeferredTaxesPercent	0.02
CY2018	wdc	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Changein Tax Rate Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017ChangeinTaxRateDeferredTaxesPercent	-0.03
	wdc	Effective Income Tax Rate Reconciliation Tax Cutsand Jobs Actof2017 Changein Tax Rate Deferred Taxes Percent EffectiveIncomeTaxRateReconciliationTaxCutsandJobsActof2017ChangeinTaxRateDeferredTaxesPercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.02
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.05
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CY2019	wdc	Effective Income Tax Rate Reconciliation Unremitted Earningsof Non U.S.Entities Percent EffectiveIncomeTaxRateReconciliationUnremittedEarningsofNonU.S.EntitiesPercent	-0.79
CY2018	wdc	Effective Income Tax Rate Reconciliation Unremitted Earningsof Non U.S.Entities Percent EffectiveIncomeTaxRateReconciliationUnremittedEarningsofNonU.S.EntitiesPercent	0
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CY2019	wdc	Effective Income Tax Rate Reconciliation Reorganization Percent EffectiveIncomeTaxRateReconciliationReorganizationPercent	0
CY2018	wdc	Effective Income Tax Rate Reconciliation Reorganization Percent EffectiveIncomeTaxRateReconciliationReorganizationPercent	0
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CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
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CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Research And Development EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment	-0.24
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CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-1.63
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Research And Development EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment	0.04
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Research And Development EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment	0.12
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.02
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.68
CY2019	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	1.33
CY2018	us-gaap	Income Tax Holiday Aggregate Dollar Amount IncomeTaxHolidayAggregateDollarAmount	519000000	USD
CY2018	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	1.69
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.48
CY2019	us-gaap	Income Tax Holiday Aggregate Dollar Amount IncomeTaxHolidayAggregateDollarAmount	393000000	USD
	us-gaap	Income Tax Holiday Aggregate Dollar Amount IncomeTaxHolidayAggregateDollarAmount	467000000	USD
	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	1.58
CY2019Q2	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	123000000	USD
CY2018Q2	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	110000000	USD
CY2017Q2	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	89000000	USD
CY2018Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	551000000	USD
CY2017Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	522000000	USD
CY2016Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	491000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	172000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	38000000	USD
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CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	8000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	30000000	USD
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CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	24000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	9000000	USD
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CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	19000000	USD
	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	8000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	11000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	11000000	USD
	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	19000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	28000000	USD
CY2019Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	695000000	USD
CY2018Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	551000000	USD
CY2017Q2	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	522000000	USD
CY2019	us-gaap	Basic Earnings Per Share Pro Forma BasicEarningsPerShareProForma	-2.58
CY2018	us-gaap	Basic Earnings Per Share Pro Forma BasicEarningsPerShareProForma	2.27
CY2019Q2	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	699000000	USD
	us-gaap	Basic Earnings Per Share Pro Forma BasicEarningsPerShareProForma	1.38
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.58
CY2018Q2	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	508000000	USD
CY2017Q2	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	493000000	USD
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	10000000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	8000000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	292000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	307000000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	296000000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-754000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	675000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	397000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	292000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	297000000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	288000000	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.20
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.34
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2000000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3000000	shares
CY2019	us-gaap	Restructuring Charges RestructuringCharges	166000000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	198000000	USD
	us-gaap	Restructuring Charges RestructuringCharges	210000000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	16000000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	11000000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	0	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	1000000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Accelerated Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	11000000	USD
CY2019	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	166000000	USD
CY2018	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	215000000	USD
	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	232000000	USD
CY2015Q1	us-gaap	Loss Contingency Number Of Plaintiffs LossContingencyNumberOfPlaintiffs	2	plaintiff
CY2015Q1	us-gaap	Loss Contingency New Claims Filed Number LossContingencyNewClaimsFiledNumber	3	claim
CY2015Q1	us-gaap	Loss Contingency Pending Claims Number LossContingencyPendingClaimsNumber	2	claim
CY2019Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3455000000	USD
CY2019Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1204000000	USD
CY2019Q2	wdc	Intercompany Receivable Net Current IntercompanyReceivableNetCurrent	0	USD
CY2019Q2	us-gaap	Inventory Net InventoryNet	3283000000	USD
CY2019Q2	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2019Q2	us-gaap	Other Assets Current OtherAssetsCurrent	535000000	USD
CY2019Q2	us-gaap	Assets Current AssetsCurrent	8477000000	USD
CY2019Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2843000000	USD
CY2019Q2	wdc	Notes Receivable And Investments In Related Parties NotesReceivableAndInvestmentsInRelatedParties	2791000000	USD
CY2019Q2	us-gaap	Goodwill Goodwill	10076000000	USD
CY2019Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1711000000	USD
CY2019Q2	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2019Q2	us-gaap	Due From Affiliate Noncurrent DueFromAffiliateNoncurrent	0	USD
CY2019Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	472000000	USD
CY2019Q2	us-gaap	Assets Assets	26370000000	USD
CY2019Q2	us-gaap	Accounts Payable Current AccountsPayableCurrent	1567000000	USD
CY2019Q2	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	331000000	USD
CY2019Q2	wdc	Intercompany Payable Current IntercompanyPayableCurrent	0	USD
CY2019Q2	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1296000000	USD
CY2019Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	347000000	USD
CY2019Q2	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2019Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	276000000	USD
CY2019Q2	us-gaap	Liabilities Current LiabilitiesCurrent	3817000000	USD
CY2019Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	10246000000	USD
CY2019Q2	us-gaap	Due To Affiliate Noncurrent DueToAffiliateNoncurrent	0	USD
CY2019Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2340000000	USD
CY2019Q2	us-gaap	Liabilities Liabilities	16403000000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	9967000000	USD
CY2019Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	26370000000	USD
CY2018Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5005000000	USD
CY2018Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	2197000000	USD
CY2018Q2	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2018Q2	us-gaap	Inventory Net InventoryNet	2944000000	USD
CY2018Q2	us-gaap	Other Assets Current OtherAssetsCurrent	492000000	USD
CY2018Q2	us-gaap	Assets Current AssetsCurrent	10638000000	USD
CY2018Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3095000000	USD
CY2018Q2	wdc	Notes Receivable And Investments In Related Parties NotesReceivableAndInvestmentsInRelatedParties	2105000000	USD
CY2018Q2	us-gaap	Goodwill Goodwill	10075000000	USD
CY2018Q2	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	2680000000	USD
CY2018Q2	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2018Q2	us-gaap	Due From Affiliate Noncurrent DueFromAffiliateNoncurrent	0	USD
CY2018Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	642000000	USD
CY2018Q2	us-gaap	Assets Assets	29235000000	USD
CY2018Q2	us-gaap	Accounts Payable Current AccountsPayableCurrent	2265000000	USD
CY2018Q2	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	259000000	USD
CY2018Q2	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2018Q2	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	1274000000	USD
CY2018Q2	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	479000000	USD
CY2018Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	179000000	USD
CY2018Q2	us-gaap	Liabilities Current LiabilitiesCurrent	4456000000	USD
CY2018Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	10993000000	USD
CY2018Q2	us-gaap	Due To Affiliate Noncurrent DueToAffiliateNoncurrent	0	USD
CY2018Q2	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2255000000	USD
CY2018Q2	us-gaap	Liabilities Liabilities	17704000000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	11531000000	USD
CY2018Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	29235000000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	16569000000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	12817000000	USD
CY2019	us-gaap	Gross Profit GrossProfit	3752000000	USD
CY2019	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	2182000000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1317000000	USD
CY2019	wdc	Intercompanyoperatingexpenseincome Intercompanyoperatingexpenseincome	0	USD
CY2019	wdc	Employeeterminationassetimpairmentandothercharges Employeeterminationassetimpairmentandothercharges	166000000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	3665000000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	87000000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	57000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	469000000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	38000000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-374000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-287000000	USD
CY2019	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	467000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-754000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	20647000000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	12942000000	USD
CY2018	us-gaap	Gross Profit GrossProfit	7705000000	USD
CY2018	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	2400000000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1473000000	USD
CY2018	wdc	Intercompanyoperatingexpenseincome Intercompanyoperatingexpenseincome	0	USD
CY2018	wdc	Employeeterminationassetimpairmentandothercharges Employeeterminationassetimpairmentandothercharges	215000000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	4088000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	3617000000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	60000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	676000000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-916000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1532000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2085000000	USD
CY2018	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1410000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	675000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	19093000000	USD
	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	13021000000	USD
	us-gaap	Gross Profit GrossProfit	6072000000	USD
	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	2441000000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1445000000	USD
	wdc	Intercompanyoperatingexpenseincome Intercompanyoperatingexpenseincome	0	USD
	wdc	Employeeterminationassetimpairmentandothercharges Employeeterminationassetimpairmentandothercharges	232000000	USD
	us-gaap	Operating Expenses OperatingExpenses	4118000000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	1954000000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	26000000	USD
	us-gaap	Interest Expense InterestExpense	847000000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-364000000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1185000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	769000000	USD
	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	372000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	397000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-754000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	39000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	28000000	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-50000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-21000000	USD
CY2018	wdc	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period And Available For Sale Securities Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodAndAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax	7000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	23000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	4000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-29000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-783000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	675000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	2000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	18000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	19000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	694000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	397000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-39000000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-115000000	USD
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	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	-151000000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	10000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-161000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	236000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1547000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	876000000	USD
CY2019	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	119000000	USD
CY2019	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	79000000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	175000000	USD
CY2019	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	7000000	USD
CY2019	wdc	Payments For Long Term Loans For Related Parties PaymentsForLongTermLoansForRelatedParties	1364000000	USD
CY2019	wdc	Proceeds From Long Term Loans For Related Parties ProceedsFromLongTermLoansForRelatedParties	766000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	20000000	USD
CY2019	wdc	Intercompanyloanstofromconsolidatedsubsidiaries Intercompanyloanstofromconsolidatedsubsidiaries	0	USD
CY2019	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1272000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	118000000	USD
CY2019	wdc	Taxes Paid On Vested Stock Awards Under Employee Stock Plans TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans	115000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	563000000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	584000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	181000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-500000000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4000000	USD
CY2019	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1550000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1829000000	USD
CY2018Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5005000000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3455000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4205000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	835000000	USD
CY2018	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	26000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	100000000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	89000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	48000000	USD
CY2018	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	19000000	USD
CY2018	wdc	Payments For Long Term Loans For Related Parties PaymentsForLongTermLoansForRelatedParties	1313000000	USD
CY2018	wdc	Proceeds From Long Term Loans For Related Parties ProceedsFromLongTermLoansForRelatedParties	571000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-18000000	USD
	wdc	Intercompanyloanstofromconsolidatedsubsidiaries Intercompanyloanstofromconsolidatedsubsidiaries	0	USD
	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	0	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1655000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	220000000	USD
CY2018	wdc	Taxes Paid On Vested Stock Awards Under Employee Stock Plans TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans	171000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	591000000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	593000000	USD
CY2018	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	-28000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	17074000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	13840000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	500000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	59000000	USD
CY2018	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3900000000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1349000000	USD
CY2017Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6354000000	USD
CY2018Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5005000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3437000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	578000000	USD
	us-gaap	Proceeds From Sale Of Machinery And Equipment ProceedsFromSaleOfMachineryAndEquipment	21000000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	281000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	94000000	USD
	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	417000000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	20000000	USD
	wdc	Payments For Long Term Loans For Related Parties PaymentsForLongTermLoansForRelatedParties	549000000	USD
	wdc	Proceeds From Long Term Loans For Related Parties ProceedsFromLongTermLoansForRelatedParties	292000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	32000000	USD
	wdc	Intercompanyloanstofromconsolidatedsubsidiaries Intercompanyloanstofromconsolidatedsubsidiaries	0	USD
	us-gaap	Investments In And Advances To Affiliates At Fair Value Gross Additions InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions	0	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-636000000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans	235000000	USD
	wdc	Taxes Paid On Vested Stock Awards Under Employee Stock Plans TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans	124000000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	119000000	USD
	wdc	Net Cash Received In Settlement Of Paid In Advance For Stock Repurchase Contracts NetCashReceivedInSettlementOfPaidInAdvanceForStockRepurchaseContracts	61000000	USD
	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	492000000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	574000000	USD
	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	21000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	11697000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	7908000000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	10000000	USD
	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4595000000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-3000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1797000000	USD
CY2016Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	8151000000	USD
CY2017Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6354000000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5028000000	USD
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4233000000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3674000000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3634000000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	1664000000	USD
CY2018Q4	us-gaap	Gross Profit GrossProfit	1044000000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	579000000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	465000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	686000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	176000000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-394000000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-381000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	511000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	-487000000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-581000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-197000000	USD
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.75
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.68
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.99
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.67
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.71
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.68
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.99
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.67
CY2017Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5181000000	USD
CY2017Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5336000000	USD
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5013000000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	5117000000	USD
CY2017Q3	us-gaap	Gross Profit GrossProfit	1913000000	USD
CY2017Q4	us-gaap	Gross Profit GrossProfit	2013000000	USD
CY2018Q1	us-gaap	Gross Profit GrossProfit	1927000000	USD
CY2018Q2	us-gaap	Gross Profit GrossProfit	1852000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	905000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	955000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	914000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	843000000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	681000000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	-823000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	61000000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	756000000	USD
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.31
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.78
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.53
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.23
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.78
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.46

Files In Submission

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$WDC
WESTERN DIGITAL CORP Stock $wdc

2019 Q3 Form 10-K Financial Statement

#000010604019000058 Filed on August 27, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WDC WESTERN DIGITAL CORP Stock $wdc

2019 Q3 Form 10-K Financial Statement

#000010604019000058 Filed on August 27, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WDC
WESTERN DIGITAL CORP Stock $wdc