Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
Mar. 31, 2017	Apr. 01, 2016
Cash flows from operating activities
Net income	$ 117	$ 608
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	1,582	734
Stock-based compensation	303	121
Deferred income taxes	61	(17)
Loss on disposal of assets	12	13
Write-off of issuance costs and amortization of debt discounts	275	3
Loss on convertible debt	6	0
Non-cash portion of employee termination, asset impairment and other charges	13	36
Other non-cash operating activities, net	58	0
Changes in:
Accounts receivable, net	(489)	278
Inventories	(117)	138
Accounts payable	319	(301)
Accounts payable to related parties	25	0
Accrued expenses	160	137
Accrued compensation	90	(68)
Other assets and liabilities, net	83	(54)
Net cash provided by operations	2,498	1,628
Cash flows from investing activities
Purchases of property, plant and equipment	(453)	(433)
Proceeds from the sale of equipment	21	0
Purchases of investments	(274)	(462)
Proceeds from sale of investments	75	604
Proceeds from maturities of investments	430	303
Investments in Flash Ventures	(20)	0
Payments For Long Term Loans For Related Parties	(480)	0
Notes receivable proceeds from Flash Ventures	276	0
Strategic investments and other, net	(21)	(23)
Net cash used in investing activities	(446)	(11)
Cash flows from financing activities
Issuance of stock under employee stock plans	123	64
Taxes paid on vested stock awards under employee stock plans	(111)	(45)
Excess tax benefits from employee stock plans	90	(2)
Proceeds from acquired call option	61	0
Repurchases of common stock	0	(60)
Dividends paid to shareholders	(428)	(347)
Repayment of debt	(12,179)	(364)
Proceeds from debt	7,908	0
Debt issuance costs	(10)	0
Proceeds from (Payments for) Other Financing Activities	0	0
Net cash used in financing activities	(4,546)	(754)
Effect of exchange rate changes on cash	(5)	0
Net increase (decrease) in cash and cash equivalents	(2,499)	863
Cash and cash equivalents, beginning of year	8,151	5,024
Cash and cash equivalents, end of period	5,652	5,887
Supplemental disclosure of cash flow information:
Cash paid for income taxes	117	38
Cash paid for interest	454	33
Supplemental disclosure of non-cash investing and financing activities:
Accrual of cash dividend declared	$ 145	$ 116

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Amount of cash inflow (outflow) from financing activities classified as other.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

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- Definition

The cash inflow from sale of machinery and equipment.

+ References

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- 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=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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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

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Namespace Prefix:	us-gaap_
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- References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Cash dividend declared but not yet paid during the period reported.

+ References

No definition available.

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Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of non-cash economic interest expense associated with the convertible senior notes, the gains and losses on the conversion of the convertible senior notes and call option, and the unrealized gains and losses related to the change in fair value of the exercise option and the call option.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Proceeds from settlements paid in advance for stock repurchase contracts.

+ References

No definition available.

+ Details

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

- Definition

Non Cash Portion Of Employee Termination Benefits And Other Charges

+ References

No definition available.

+ Details

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Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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- 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

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Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Taxes paid on vested stock awards under employee stock plans.

+ References

No definition available.

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Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
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