Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
Sep. 28, 2018	Sep. 29, 2017
Cash flows from operating activities
Net income (loss)	$ 511	$ 681
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	480	533
Stock-based compensation	79	97
Deferred income taxes	201	36
Loss on disposal of assets	2	1
Write-off of issuance costs and amortization of debt discounts	9	10
Other non-cash operating activities, net	20	11
Changes in:
Accounts receivable, net	(22)	(148)
Inventories	(175)	44
Accounts payable	(77)	(146)
Accounts payable to related parties	27	20
Accrued expenses	34	164
Accrued compensation	20	(38)
Other assets and liabilities, net	(404)	(132)
Net cash provided by operating activities	705	1,133
Cash flows from investing activities
Purchases of property, plant and equipment	(277)	(160)
Proceeds from the sale of property, plant and equipment	0	5
Acquisitions, net of cash acquired	0	(93)
Purchases of investments	(11)	(38)
Proceeds from sale of investments	6	14
Proceeds from maturities of investments	3	2
Notes receivable issuances to Flash Ventures	(115)	(229)
Notes receivable proceeds from Flash Ventures	144	98
Strategic investments and other, net	(9)	23
Net cash used in investing activities	(259)	(378)
Cash flows from financing activities
Issuance of stock under employee stock plans	8	20
Taxes paid on vested stock awards under employee stock plans	(66)	(61)
Repurchases of common stock	(563)	0
Dividends paid to shareholders	(148)	(147)
Dividends paid to shareholders	0	26
Repayment of debt	(38)	(62)
Net cash used in financing activities	(807)	(224)
Effect of exchange rate changes on cash	2	1
Net increase (decrease) in cash and cash equivalents	(359)	532
Cash and cash equivalents, beginning of year	5,005	6,354
Cash and cash equivalents, end of period	4,646	6,886
Supplemental disclosure of cash flow information:
Cash paid for income taxes	191	73
Cash paid for interest	$ 139	$ 71

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Name:	us-gaap_ProceedsFromSaleOfMachineryAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with long-term loans for related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

No definition available.

+ Details

Name:	wdc_PaymentsForLongTermLoansForRelatedParties
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with long-term loans for related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

No definition available.

+ Details

Name:	wdc_ProceedsFromLongTermLoansForRelatedParties
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Taxes paid on vested stock awards under employee stock plans.

+ References

No definition available.

+ Details

Name:	wdc_TaxesPaidOnVestedStockAwardsUnderEmployeeStockPlans
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration