Seagate Technology (STX) 10-Q30 Apr 142014 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Mar. 28, 2014	Apr. 25, 2014
Document And Entity Information	'	'
Entity Registrant Name	'Seagate Technology plc	'
Entity Central Index Key	'0001137789	'
Document Type	'10-Q	'
Document Period End Date	28-Mar-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--06-27	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	326,559,178
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Current assets:	'	'
Cash and cash equivalents	$2,259	$1,708
Short-term investments	47	480
Restricted cash and investments	4	101
Accounts receivable, net	1,633	1,670
Inventories	846	854
Deferred income taxes	116	115
Other current assets	246	484
Total current assets	5,151	5,412
Property, equipment and leasehold improvements, net	2,065	2,269
Goodwill	477	476
Other intangible assets, net	304	405
Deferred income taxes	467	456
Other assets, net	195	225
Total Assets	8,659	9,243
Current liabilities:	'	'
Accounts payable	1,345	1,690
Accrued employee compensation	212	335
Accrued warranty	152	176
Accrued expenses	453	407
Current portion of long-term debt	0	3
Total current liabilities	2,162	2,611
Long-term accrued warranty	134	144
Long-term accrued income taxes	90	87
Other non-current liabilities	121	121
Long-term debt, less current portion	3,514	2,774
Total Liabilities	6,021	5,737
Seagate Technology plc Shareholders' Equity:	'	'
Ordinary shares and additional paid-in capital	5,471	5,286
Accumulated other comprehensive loss	-2	-13
Accumulated deficit	-2,831	-1,778
Total Seagate Technology plc Shareholders' Equity	2,638	3,495
Noncontrolling interest	0	11
Total Equity	2,638	3,506
Total Liabilities and Equity	$8,659	$9,243

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Income Statement [Abstract]	'	'	'	'
Revenue	$3,406	$3,526	$10,423	$10,927
Cost of revenue	2,447	2,578	7,502	7,926
Product development	297	294	903	839
Marketing and administrative	190	168	561	457
Amortization of intangibles	26	20	71	59
Restructuring and other, net	2	1	20	2
Total operating expenses	2,962	3,061	9,057	9,283
Income from operations	444	465	1,366	1,644
Interest income	1	2	7	6
Interest expense	-52	-53	-145	-163
Other, net	-3	16	44	41
Other expense, net	-54	-35	-94	-116
Income before income taxes	390	430	1,272	1,528
(Benefit from) provision for income taxes	-5	14	22	38
Net income	395	416	1,250	1,490
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Seagate Technology plc	$395	$416	$1,250	$1,490
Net income per share attributable to Seagate Technology plc ordinary shareholders:	'	'	'	'
Basic (in dollars per share)	$1.21	$1.16	$3.68	$3.98
Diluted (in dollars per share)	$1.17	$1.13	$3.56	$3.86
Number of shares used in per share calculations:	'	'	'	'
Basic (in shares)	327	358	340	374
Diluted (in shares)	338	369	351	386
Cash dividends declared per Seagate Technology plc ordinary share (in dollars per share)	$0.43	$0	$1.24	$1.02

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014		Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Statement of Comprehensive Income [Abstract]	'		'	'	'
Net Income	$395		$416	$1,250	$1,490
Cash flow hedges	'		'	'	'
Change in unrealized gain on cash flow hedges	1		0	0	0
Less: reclassification for amounts included in net income	0		0	0	0
Net change	1		0	0	0
Marketable securities	'		'	'	'
Change in unrealized gain on marketable securities	0		11	1	34
Less: reclassification for amounts included in net income	0	[1]	-19	0	-18	[1]
Net change	0		-8	1	16
Post-retirement plans	'		'	'	'
Change in unrealized gain on post-retirement plans	0		0	1	0
Less: reclassification for amounts included in net income	0		0	0	0
Net change	0		0	1	0
Foreign currency translation adjustments	'		'	'	'
Foreign currency translation adjustments	4		-3	9	0
Total other comprehensive income (loss), net of tax	5		-11	11	16
Comprehensive income	400		405	1,261	1,506
Less: Comprehensive income attributable to noncontrolling interest	0		0	0	1
Comprehensive income attributable to Seagate Technology plc	$400		$405	$1,261	$1,505

[1]	The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013
OPERATING ACTIVITIES	'	'
Net Income	$1,250	$1,490
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	668	651
Share-based compensation	87	56
Deferred income taxes	-17	-14
Gain on sale of investments	32	51
Gain on sale of property and equipment	6	34
Loss on redemption and repurchase of debt	7	31
Other non-cash operating activities, net	16	1
Changes in operating assets and liabilities:	'	'
Restricted cash	104	0
Accounts receivable, net	32	769
Inventories	8	123
Accounts payable	-274	-462
Accrued employee compensation	-123	-85
Accrued expenses, income taxes and warranty	16	-124
Vendor non-trade receivables	204	0
Other assets and liabilities	41	308
Net cash provided by operating activities	1,981	2,659
INVESTING ACTIVITIES	'	'
Acquisition of property, equipment and leasehold improvements	-428	-658
Proceeds from the sale of property and equipment	0	29
Proceeds from the sale of strategic investments	72	0
Purchases of short-term investments	-87	-227
Sales of short-term investments	463	201
Maturities of short-term investments	61	26
Cash used in acquisition of LaCie S.A., net of cash acquired	0	-36
Other investing activities, net	29	16
Net cash provided by (used in) investing activities	52	-681
FINANCING ACTIVITIES	'	'
Repayments of long-term debt and capital lease obligations	64	421
Net proceeds from issuance of long-term debt	791	0
Repurchases of ordinary shares	-1,886	-1,612
Dividends to shareholders	-417	-381
Proceeds from issuance of ordinary shares under employee stock plans	98	233
Escrow deposit for acquisition of noncontrolling shares of LaCie S.A.	0	-72
Other financing activities, net	-5	0
Net cash used in financing activities	-1,483	-2,253
Effect of foreign currency exchange rate changes on cash and cash equivalents	1	1
Increase (decrease) in cash and cash equivalents	551	-274
Cash and cash equivalents at the beginning of the period	1,708	1,707
Cash and cash equivalents at the end of the period	$2,259	$1,433

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)	Total	Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Parent [Member]	Noncontrolling Interest [Member]
In Millions, unless otherwise specified	Total	Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Parent [Member]	Noncontrolling Interest [Member]
Total Seagate Technology plc Shareholders' Equity, Starting Balance at Jun. 28, 2013	$3,495	$0	$5,286	($13)	($1,778)	$3,495	'
Noncontrolling Interest Equity, Starting Balance at Jun. 28, 2013	11	'	'	'	'	'	11
Total Equity, Beginning balance at Jun. 28, 2013	3,506	'	'	'	'	'	'
Starting Balance (in shares) at Jun. 28, 2013	'	359	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'
Net Income	1,250	'	'	'	1,250	1,250	0
Other comprehensive income	11	'	'	10	'	10	1
Issuance of ordinary shares under employee stock plans	98	'	98	'	'	98	'
Issuance of ordinary shares under employee stock plans (in shares)	'	8	'	'	'	'	'
Repurchases of ordinary shares	-1,886	'	'	'	-1,886	-1,886	'
Repurchases of ordinary shares (in shares)	-41	-41	'	'	'	'	'
Dividends to shareholders	-417	'	'	'	-417	-417	'
Share-based compensation	87	'	87	'	'	87	'
Purchase of additional subsidiary shares from noncontrolling interest	-11	'	'	1	'	1	-12
Total Seagate Technology plc Shareholders' Equity, Ending Balance at Mar. 28, 2014	2,638	0	5,471	-2	-2,831	2,638	'
Noncontrolling Interest Equity, Ending Balance at Mar. 28, 2014	0	'	'	'	'	'	0
Total Equity, Ending balance at Mar. 28, 2014	$2,638	'	'	'	'	'	'
Ending Balance (in shares) at Mar. 28, 2014	'	326	'	'	'	'	'

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Mar. 28, 2014
Accounting Policies [Abstract]	'
Basis of Presentation and Summary of Significant Accounting Policies	'
	Basis of Presentation and Summary of Significant Accounting Policies
	Organization
	The Company is a leading provider of data storage products. Its principal products are hard disk drives, commonly referred to as disk drives, hard drives or HDDs. Hard disk drives are devices that store digitally encoded data on rapidly rotating disks with magnetic surfaces. Disk drives are used as the primary medium for storing electronic data.
	The Company produces a broad range of electronic data storage products including HDDs, solid state hybrid drives (“SSHD”) and solid state drives (“SSD”), which address enterprise applications, where its products are designed for enterprise servers, mainframes and workstations; client compute applications, where its products are designed primarily for desktop and notebook computers; and client non-compute applications, where its products are designed for a wide variety of end user devices such as digital video recorders (“DVRs”), personal data backup systems, portable external storage systems and digital media systems. In addition to manufacturing and selling data storage products, the Company provides data storage services for small to medium-sized businesses, including online backup, data protection and recovery solutions.
	Basis of Presentation and Consolidation
	The unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned and majority-owned subsidiaries, after elimination of intercompany transactions and balances. The preparation of financial statements in accordance with U.S. generally accepted accounting principles also requires management to make estimates and assumptions that affect the amounts reported in the Company’s condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. The methods, estimates and judgments the Company uses in applying its most critical accounting policies have a significant impact on the results the Company reports in its condensed consolidated financial statements. The condensed consolidated financial statements reflect, in the opinion of management, all material adjustments necessary to present fairly the condensed consolidated financial position, results of operations, comprehensive income, cash flows and shareholders’ equity for the periods presented. Such adjustments are of a normal and recurring nature. The Company’s Consolidated Financial Statements for the fiscal year ended June 28, 2013, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 7, 2013. The Company believes that the disclosures included in the unaudited Condensed Consolidated Financial Statements, when read in conjunction with its Consolidated Financial Statements as of June 28, 2013, and the notes thereto, are adequate to make the information presented not misleading.
	The results of operations for the three and nine months ended March 28, 2014, are not necessarily indicative of the results of operations to be expected for any subsequent interim period in the Company’s fiscal year ending June 27, 2014. The Company operates and reports financial results on a fiscal year of 52 or 53 weeks ending on the Friday closest to June 30. The three and nine months ended March 28, 2014 and March 29, 2013 each consisted of 13 weeks and 39 weeks, respectively. Fiscal year 2014 will be comprised of 52 weeks and will end on June 27, 2014.
	Summary of Significant Accounting Policies
	Other than the revised presentation of accumulated other comprehensive income described below, there have been no significant changes in our significant accounting policies. Please refer to Note 1 of “Financial Statements and Supplementary Data” contained in Part II, Item 8 of the Company’s Annual Report on Form 10-K for the fiscal year ended June 28, 2013, as filed with the SEC on August 7, 2013 for a discussion of the Company’s other significant accounting policies.
	Recently Issued Accounting Pronouncements
	In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (ASC Topic 220) — Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The ASU requires an entity to report information, either on the face of the statement where net income is presented or in the notes, about the amounts reclassified out of accumulated other comprehensive income by component and to report significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. The ASU has been adopted by the Company effective for the first quarter of fiscal year 2014. Other than requiring additional disclosures, the adoption of this new guidance did not have a material impact on the Company's consolidated financial statements.
	In July, 2013, the FASB issued ASU No. 2013-11, Income Taxes (ASC Topic 740) — Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The amendments in this ASU provide explicit guidance that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, with limited exceptions. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 and do not require new recurring disclosures. The adoption of this new guidance will not have a material impact on the Company's consolidated financial statements.

Balance_Sheet_Information

Balance Sheet Information	9 Months Ended
	Mar. 28, 2014
Disclosure Text Block Supplement [Abstract]	'
Balance Sheet Information	'
	Balance Sheet Information
	Investments
	The following table summarizes, by major type, the fair value and amortized cost of the Company’s investments as of March 28, 2014:


	(Dollars in millions)		Amortized			Unrealized				Fair
			Cost			Gain/(Loss)				Value
	Available-for-sale securities:

	Money market funds		$	757		$	—			$	757

	Commercial paper		1,051			—				1,051

	Corporate bonds		5			—				5

	U.S. treasuries and agency bonds		—			—				—

	Certificates of deposit		132			—				132

	Auction rate securities		17			(2		)		15

	Equity securities		—			—				—

	Other debt securities		—			—				—

			1,962			(2		)		1,960

	Trading securities		—			—				—

	Total		$	1,962		$	(2	)		$	1,960


	Included in Cash and cash equivalents									$	1,894

	Included in Short-term investments									47

	Included in Restricted cash and investments									4

	Included in Other assets, net									15

	Total									$	1,960


	As of March 28, 2014, the Company’s Restricted cash and investments consisted of $4 million in cash and investments held as collateral at banks for various performance obligations. As of June 28, 2013, the Company’s Restricted cash and investments consisted of $79 million in cash equivalents and investments held in trust for payment of its non-qualified deferred compensation plan liabilities and $22 million in cash and investments held as collateral at banks for various performance obligations. The Restricted cash and investment balance decreased since June 28, 2013 as restrictions on the cash and investments were removed during the year.
	The Company’s available-for-sale securities include investments in auction rate securities. Beginning in fiscal year 2008, the Company’s auction rate securities failed to settle at auction and have continued to fail through March 28, 2014. Since the Company continues to earn interest on its auction rate securities at the maximum contractual rate, there have been no payment defaults with respect to such securities, and they are all collateralized, the Company expects to recover the entire amortized cost basis of these auction rate securities. The Company does not intend to sell these securities and has concluded it is not more likely than not that the Company will be required to sell the securities before the recovery of their amortized cost basis. As such, the Company believes the impairments totaling $2 million are not other-than-temporary and therefore have been recorded in Accumulated other comprehensive loss. Given the uncertainty as to when the liquidity issues associated with these securities will improve, these securities are classified within Other assets, net in the Company’s Condensed Consolidated Balance Sheets.
	As of March 28, 2014, with the exception of the Company’s auction rate securities, the Company had no available-for-sale securities that had been in a continuous unrealized loss position for a period greater than 12 months. The Company determined no available-for-sale securities were other-than-temporarily impaired as of March 28, 2014.
	The fair value and amortized cost of the Company’s investments classified as available-for-sale at March 28, 2014, by remaining contractual maturity were as follows:


	(Dollars in millions)		Amortized			Fair
			Cost			Value
	Due in less than 1 year		$	1,945		$	1,945

	Due in 1 to 5 years		—			—

	Thereafter		17			15

	Total		$	1,962		$	1,960

	The following table summarizes, by major type, the fair value and amortized cost of the Company’s investments as of June 28, 2013:


	(Dollars in millions)		Amortized			Unrealized				Fair
Cost			Gain/(Loss)			Value
Available-for-sale securities:

Money market funds		$	804		$	—			$	804

Commercial paper		655			—				655

Corporate bonds		211			—				211

U.S. treasuries and agency bonds		96			—				96

Certificates of deposit		154			—				154

Auction rate securities		17			(2		)		15

Equity Securities		4			—				4

Other debt securities		107			(1		)		106

		2,048			(3		)		2,045

Trading securities		74			5				79

Total		$	2,122		$	2			$	2,124


Included in Cash and cash equivalents									$	1,528

Included in Short-term investments									480

Included in Restricted cash and investments									101

Included in Other assets, net									15

Total									$	2,124


As of June 28, 2013, with the exception of the Company’s auction rate securities, the Company had no material available-for-sale securities that had been in a continuous unrealized loss position for a period greater than 12 months. The Company determined no material available-for-sale securities were other-than-temporarily impaired as of June 28, 2013.
Inventories
The following table provides details of the inventory balance sheet item:


(Dollars in millions)		March 28,			June 28,
		2014			2013
Raw materials and components		$	246		$	213

Work-in-process		260			231

Finished goods		340			410

		$	846		$	854

Other Current Assets
The following table provides details of the other current assets balance sheet item:


(Dollars in millions)		March 28,			June 28,
		2014			2013
Vendor non-trade receivables		$	124		$	329

Other		122			155

		$	246		$	484


Other current assets include non-trade receivables from certain manufacturing vendors resulting from the sale of components to these vendors who manufacture completed sub-assemblies or finished goods for the Company. The Company does not reflect the sale of these components in revenue and does not recognize any profits on these sales. The costs of the completed sub-assemblies are included in inventory upon purchase from the vendors.
Property, Equipment and Leasehold Improvements, net
The components of property, equipment and leasehold improvements, net, were as follows:


(Dollars in millions)		March 28,			June 28,
		2014			2013
Property, equipment and leasehold improvements		$	8,807		$	8,544

Accumulated depreciation and amortization		(6,742		)	(6,275		)
		$	2,065		$	2,269


Accumulated Other Comprehensive Income (Loss) (“AOCI”)
The components of AOCI, net of tax, were as follows:


(Dollars in millions)		Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Marketable Securities (a)				Unrealized Gains (Losses) on post-retirements			Foreign currency translation adjustments		Total
Balance at June 28, 2013		$	—		$	(3	)		$	(10	)	$	—	$	(13	)

Other comprehensive income before reclassifications		—			1				1			9		11

Amounts reclassified from AOCI		—			—				—			—		—

Other comprehensive income		—			1				1			9		11

Balance at March 28, 2014		$	—		$	(2	)		$	(9	)	$	9	$	(2	)


Balance at June 29, 2012		$	—		$	(1	)		$	(8	)	$	—	$	(9	)

Other comprehensive income before reclassifications		—			34				—			—		34

Amounts reclassified from AOCI		—			(18		)		—			—		(18		)

Other comprehensive income		—			16				—			—		16

Balance at March 29, 2013		$	—		$	15			$	(8	)	$	—	$	7

___________________________________________
(a)The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt

Debt	9 Months Ended
	Mar. 28, 2014
Debt Disclosure [Abstract]	'
Debt	'
	Debt
	Short-Term Borrowings
	On January 18, 2011, the Company and its subsidiary, Seagate HDD Cayman (“the Borrower”), entered into a Credit Agreement which provided a $350 million senior secured revolving credit facility (the “Revolving Credit Facility”). On April 30, 2013, the Company and Seagate HDD Cayman entered into the Second Amendment to the Credit Agreement which increased the commitments available under the Revolving Credit Facility from $350 million to $500 million. The Company and certain of its material subsidiaries fully and unconditionally guarantee the Revolving Credit Facility. The Revolving Credit Facility matures in April 2018, and is available for cash borrowings and for the issuance of letters of credit up to a sub-limit of $75 million. As of March 28, 2014, no borrowings were drawn under the Revolving Credit Facility, or were utilized for letters of credit.
	Long-Term Debt
	$800 million Aggregate Principal Amount of 3.75% Senior Notes due November 2018 (the “Notes”). On November 5, 2013, Seagate HDD Cayman, issued $800 million in aggregate principal amount of 3.75% Senior Notes, which mature on November 15, 2018, in a private placement. The interest on the Notes is payable semi-annually on May 15 and November 15 of each year. The Notes are redeemable at the option of Seagate HDD Cayman in whole or in part, on not less than 30, nor more than 60 days' notice, at a “make-whole” premium redemption price. The “make-whole” premium redemption price will be equal to the greater of (1) 100% of the principal amount of the notes being redeemed, or (2) the sum of the present values of the remaining schedule payments of principal and interest on the Notes being redeemed, discounted at the redemption date on a semi-annual basis at a rate equal to the sum of the applicable Treasury rate plus 50 basis points basis points. Accrued and unpaid interest, if any will be paid to, but excluding, the redemption date. The Notes are fully and unconditionally guaranteed by the Company on a senior unsecured basis. Seagate HDD Cayman and the Company are required to exchange the Notes for notes registered under the Securities Act of 1933, as amended, by January 30, 2015 if the Notes have not otherwise become freely transferable by that time.
	$600 million Aggregate Principal Amount of 6.8% Senior Notes due October 2016 (the “2016 Notes”). The interest on the 2016 Notes is payable semi-annually on April 1 and October 1 of each year. The issuer under the 2016 Notes is Seagate HDD Cayman, and the obligations under the 2016 Notes are unconditionally guaranteed by certain of the Company’s significant subsidiaries.
	$750 million Aggregate Principal Amount of 7.75% Senior Notes due December 2018 (the “2018 Notes”). The interest on the 2018 Notes is payable semi-annually on June 15 and December 15 of each year. The issuer under the 2018 Notes is Seagate HDD Cayman and the obligations under the 2018 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	$600 million Aggregate Principal Amount of 6.875% Senior Notes due May 2020 (the “2020 Notes”). The interest on the 2020 Notes is payable semi-annually on May 1 and November 1 of each year. The issuer under the 2020 Notes is Seagate HDD Cayman, and the obligations under the 2020 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company. During the March 2014 quarter, the Company repurchased $28 million aggregate principal amount of its 2020 Notes for cash at a premium to their principal amount, plus accrued and unpaid interest. The Company recorded a loss on the repurchase of approximately of $3 million, which is included in Other, net in the Company's Condensed Consolidated Statement of Operations.
	$600 million Aggregate Principal Amount of 7.00% Senior Notes due November 2021 (the “2021 Notes”). The interest on the 2021 Notes is payable semi-annually on January 1 and July 1 of each year. The issuer under the 2021 Notes is Seagate HDD Cayman and the obligations under the 2021 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by certain of the Company’s significant subsidiaries. During the March 2014 quarter, the Company repurchased $30 million aggregate principal amount of its 2021 Notes for cash at a premium to their principal amount, plus accrued and unpaid interest. The Company recorded a loss on the repurchase of approximately of $4 million, which is included in Other, net in the Company's Condensed Consolidated Statement of Operations.
	$1 billion Aggregate Principal Amount of 4.75% Senior Notes due June 1, 2023 (the “2023 Notes”). The interest on the 2023 Notes is payable semi-annually on June 1 and December 1 of each year. The issuer under the 2023 Notes is Seagate HDD Cayman and the obligations under the 2023 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	Other As part of our acquisition of LaCie S.A., $6 million of long-term debt was assumed. The outstanding balance was fully paid off at December 27, 2013. The outstanding balance at June 28, 2013 was $3 million and was classified as Current portion of long-term debt.
	At March 28, 2014, future principal payments on long-term debt were as follows (in millions):


	Fiscal Year	Amount
	Remainder of 2014	$	—

	2015	—

	2016	—

	2017	334

	2018	—

	Thereafter	3,180

		$	3,514

Income_Taxes

Income Taxes	9 Months Ended
Income Taxes	Mar. 28, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The Company recorded an income tax benefit of $5 million and an income tax provision of $22 million in the three and nine months ended March 28, 2014, respectively. The income tax benefit for the three months ended March 28, 2014 included $14 million of net discrete tax benefits related to releases of tax reserves due to audit settlements. The income tax provision recorded for the nine months ended March 28, 2014 included $7 million of net discrete tax benefits for the reversal of a portion of the U.S. valuation allowance recorded in prior periods and a net decrease in tax reserves related to audit settlements offset by tax reserves on non-U.S. tax positions taken in prior fiscal years.
	The Company's income tax provision recorded for the three and nine months ended March 28, 2014 differed from the provision for income taxes that would be derived by applying the Irish statutory rate of 25% to income before income taxes, primarily due to the net effect of (i) tax benefits related to non-U.S. earnings generated in jurisdictions that are subject to tax holidays or tax incentive programs and are considered indefinitely reinvested outside of Ireland and (ii) a decrease in valuation allowance for certain deferred tax assets.
	During the nine months ended March 28, 2014, the Company's unrecognized tax benefits excluding interest and penalties decreased by $45 million to $112 million primarily due to (i) reductions associated with changes in prior years’ positions of $55 million, (ii) reductions associated with the expiration of certain statutes of limitation of $3 million, and (iii) increases in current year unrecognized tax benefits of $13 million.
	The unrecognized tax benefits that, if recognized, would impact the effective tax rate were $112 million at March 28, 2014, subject to certain future valuation allowance reversals. During the 12 months beginning March 29, 2014, the Company expects that its unrecognized tax benefits could be reduced anywhere from zero to $55 million as a result of audit settlements and the expiration of certain statutes of limitation.
	The Company’s U.S. income tax examination for fiscal years 2008, 2009 and 2010 is ongoing. The Company’s China subsidiaries are under examination by the Chinese tax administration for years 2007 through 2012. These examinations may result in proposed adjustments to the income taxes as filed during these periods. The Company believes that it has adequately provided for these matters, but there is a reasonable possibility that an adverse outcome of these examinations could have a material effect on the Company’s financial results. In this case, the Company would consider pursuing all possible remedies available, including appeals, judicial review and competent authority.
	The Company is subject to tax in numerous jurisdictions around the world. Although no examinations are currently in progress other than those in China and in the United States, the Company believes it has provided adequately for all reasonable outcomes.
	The Company recorded an income tax provision of $14 million and $38 million for the three and nine months ended March 29, 2013, respectively. The income tax provision recorded for the three months ended March 29, 2013 included approximately $4 million of discrete charges primarily related to an increase in income tax reserves recorded for non-U.S. income tax positions taken in prior fiscal years. The income tax provision recorded for the nine months ended March 29, 2013 included approximately $5 million of net discrete charges primarily associated with the reversal of prior period tax benefits and income tax reserves for non-U.S. income tax positions taken in prior fiscal years offset by the release of tax reserves associated with the expiration of certain statutes of limitation.
	The Company's income tax provision recorded for the three and nine months ended March 29, 2013 differed from the provision for income taxes that would be derived by applying the Irish statutory rate of 25% to income before income taxes, primarily due to the net effect of (i) tax benefits related to non-U.S. earnings generated in jurisdictions that are subject to tax holidays or tax incentive programs and are considered indefinitely reinvested outside of Ireland and (ii) a decrease in valuation allowance for certain U.S. deferred tax assets.

Acquisitions

Acquisitions	9 Months Ended
	Mar. 28, 2014
Business Combinations [Abstract]	'
Business Combination Disclosure	'
	Acquisitions
	LaCie S.A.
	On August 3, 2012 the Company acquired 23,382,904 (or approximately 64.5%) of the outstanding shares of LaCie S.A. (“LaCie”) for a price of €4.05 per share with a price supplement of €0.12 per share, which would have been payable if the Company had successfully acquired at least 95% of the outstanding shares of LaCie within 6 months of the acquisition. Of the amount paid at the acquisition date, €9 million is treated as compensation cost to one of the selling shareholders, who is now an employee of the Company, to be recognized over a period of 36 months from the acquisition date, and may be refunded to the Company if the selling shareholder is no longer employed at the end of that period. The transaction and related agreements are expected to accelerate the Company's growth strategy in the expanding consumer storage market, particularly in Europe, Japan and in premium distribution channels.
	The acquisition-date fair value of the consideration transferred for the business combination totaled $111 million, including cash paid of $107 million, and contingent consideration of $4 million.
	The following table summarizes the estimated fair values of the assets acquired, liabilities assumed, and noncontrolling interest at the acquisition date (in millions):


	(Dollars in millions)	Amount
	Cash and cash equivalents	$	71

	Accounts receivable	29

	Marketable securities	27

	Inventories	46

	Other current and non-current assets	19

	Property, plant and equipment	12

	Intangible assets	45

	Goodwill	13

	Total assets	262

	Accounts payable and accrued expenses	(73		)
	Current and non-current portion of long-term debt	(6		)
	Total liabilities	(79		)
	Noncontrolling interest	(72		)
	Total	$	111

	The following table shows the fair value of the separately identifiable intangible assets at the time of acquisition and the period over which each intangible asset will be amortized:


	(Dollars in millions)		Fair Value		Weighted-
					Average
					Amortization
					Period
	Customer relationships		$	31	5.0 years

	Existing technology		1		5.0 years

	Trade name		13		5.0 years

	Total acquired identifiable intangible assets		$	45

	Since the acquisition date, the Company recorded adjustments to the fair value of certain assets acquired and liabilities assumed with LaCie S.A. that resulted in a net increase of $1 million to Goodwill, and a corresponding decrease in Intangible assets.
	The goodwill recognized is attributable primarily to the benefits the Company expects to derive from LaCie's brand recognition and the acquired workforce, and is not deductible for income tax purposes. The acquisition date fair value of the noncontrolling interest is based on the market price of their publicly traded shares as of the first trading date subsequent to the acquisition, as the shares did not trade on the acquisition date.
	The €0.12 supplement was not paid as 95% of the LaCie business was not acquired within six months of the acquisition date, resulting in a reversal of the contingent consideration liability which was recorded as a reduction of Marketing and administrative expenses of $4 million.
	The amounts of revenue and earnings of LaCie included in the Company's Condensed Consolidated Statement of Operations from the acquisition date are not significant.
	The Company deposited $72 million into an escrow account with the intention of acquiring the remaining publicly held shares of LaCie through public and private transactions. As of December 27, 2013, the Company had completed the acquisition of all outstanding shares. The use of this deposit is treated as a non-cash financing activity and excluded from the Statement of Cash Flows.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	9 Months Ended
	Mar. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	The changes in the carrying amount of goodwill for the nine months ended March 28, 2014, are as follows:


	(Dollars in millions)	Amount
	Balance at June 28, 2013	$	476

	Foreign currency translation effect	1

	Balance at March 28, 2014	$	477

	The carrying value of other intangible assets subject to amortization as of March 28, 2014, is set forth in the following table:


	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	138	$	(137	)	$	1	3.3 years

	Customer relationships		432		(172		)	260		3.5 years

	Trade name		15		(5		)	10		3.3 years

	In-process research and development (a)		44		(11		)	33		1.2 years

	Total amortizable other intangible assets		$	629	$	(325	)	$	304	3.3 years

	___________________________________________
	(a) During the December 2013 quarter, the in-process research and development was completed, and the related asset was accounted for as a finite-lived intangible asset.
	The carrying value of other intangible assets subject to amortization as of June 28, 2013 is set forth in the following table:


	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	138	$	(105	)	$	33	0.5 years

	Customer relationships		431		(114		)	317		4.3 years

	Trade Name		14		(3		)	11		4.1 years

	Total amortizable other intangible assets		$	583	$	(222	)	$	361	3.9 years


	For the three and nine months ended March 28, 2014, amortization expense of other intangible assets was $26 million and $103 million, respectively. For the three and nine months ended March 29, 2013, amortization expense of other intangible assets was $37 million and $110 million.
	As of March 28, 2014, expected amortization expense for other intangible assets for each of the next five years and thereafter is as follows:


	(Dollars in millions)	Amount
	Remainder of 2014	$	26

	2015	102

	2016	79

	2017	69

	2018	28

	Thereafter	—

		$	304

Derivative_Financial_Instrumen

Derivative Financial Instruments	9 Months Ended
Derivative Financial Instruments	Mar. 28, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities Disclosure	'
	Derivative Financial Instruments
	The Company is exposed to foreign currency exchange rate, interest rate, and to a lesser extent, equity price risks relating to its ongoing business operations. The Company enters into foreign currency forward exchange contracts to manage the foreign currency exchange rate risk on forecasted expenses denominated in foreign currencies and to mitigate the remeasurement risk of certain foreign currency denominated liabilities. The Company’s accounting policies for these instruments are based on whether the instruments are classified as designated or non-designated hedging instruments. The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The changes in the fair values of the effective portions of designated cash flow hedges are recorded in Accumulated other comprehensive loss until the hedged item is recognized in earnings. Derivatives that are not designated as hedging instruments and the ineffective portions of cash flow hedges are adjusted to fair value through earnings. The amount of net unrealized gains (losses) on cash flow hedges was not material as of March 28, 2014 and June 28, 2013.
	The Company dedesignates its cash flow hedges when the forecasted hedged transactions are realized or it is probable the forecasted hedged transactions will not occur in the initially identified time period. At such time, the associated gains and losses deferred in Accumulated other comprehensive loss are reclassified immediately into earnings and any subsequent changes in the fair value of such derivative instruments are immediately reflected in earnings. The Company did not recognize any net gains or losses related to the loss of hedge designation on discontinued cash flow hedges during the three and nine months ended March 28, 2014. As of March 28, 2014, the Company’s existing foreign currency forward exchange contracts mature within 12 months. The deferred amount currently recorded in Accumulated other comprehensive loss expected to be recognized into earnings over the next 12 months is immaterial.
	The following tables show the total notional value of the Company’s outstanding foreign currency forward exchange contracts as of March 28, 2014 and June 28, 2013:


			As of March 28, 2014
	(Dollars in millions)		Contracts				Contracts Not
			Designated as				Designated as
			Hedges				Hedges
	Thai baht		$	—			$	20
	Thai baht		$	—			$	20
	Singapore dollars		33				18
	Singapore dollars		33				18
	Chinese renminbi		—				—
	Chinese renminbi		—				—
			$	33			$	38
			$	33			$	38



			As of June 28, 2013
	(Dollars in millions)		Contracts				Contracts Not
			Designated as				Designated as
			Hedges				Hedges
	Thai baht		$	—			$	20
	Thai baht		$	—			$	20
	Singapore dollars		—				—
	Singapore dollars		—				—
	Chinese renminbi		—				—
	Chinese renminbi		—				—
	Czech koruna		—				—
	Czech koruna		—				—
			$	—			$	20
			$	—			$	20
	The Company is subject to equity market risks due to changes in the fair value of the notional investments selected by its employees as part of its Non-qualified Deferred Compensation Plan—the Seagate Deferred Compensation Plan (the “SDCP”). In the quarter ended December 27, 2013, the Company entered into a Total Return Swap (“TRS”) in order to manage the equity market risks associated with the SDCP liabilities. The Company pays a floating rate, based on LIBOR plus an interest rate spread, on the notional amount of the TRS. The TRS is designed to substantially offset changes in the SDCP liability due to changes in the value of the investment options made by employees. As of March 28, 2014, the notional investments underlying the TRS amounted to $88 million. The contract term of the TRS is approximately one year and is settled on a monthly basis, therefore limiting counterparty performance risk. The Company did not designate the TRS as a hedge. Rather, the Company records all changes in the fair value of the TRS to earnings to offset the market value changes of the SDCP liabilities.
	The following table shows the Company’s derivative instruments measured at fair value as reflected in the Condensed Consolidated Balance Sheet as of March 28, 2014 and June 28, 2013:


			As of March 28, 2014
			Asset Derivatives						Liability Derivatives
	(Dollars in millions)		Balance Sheet		Fair Value				Balance Sheet		Fair Value
	(Dollars in millions)		Location		Fair Value				Location		Fair Value
	Derivatives designated as hedging instruments:
	Derivatives designated as hedging instruments:
	Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
	Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
	Derivatives not designated as hedging instruments:
	Derivatives not designated as hedging instruments:
	Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		—
	Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		—
	Total return swap		Other current assets		—				Accrued expenses		—
	Total return swap		Other current assets		—				Accrued expenses		—
	Total derivatives				$	—					$	—
	Total derivatives				$	—					$	—



			As of June 28, 2013
			Asset Derivatives						Liability Derivatives
	(Dollars in millions)		Balance Sheet		Fair Value				Balance Sheet		Fair Value
	(Dollars in millions)		Location		Fair Value				Location		Fair Value
	Derivatives designated as hedging instruments:
	Derivatives designated as hedging instruments:
Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
Derivatives not designated as hedging instruments:
Derivatives not designated as hedging instruments:
Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		(1		)
Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		(1		)
Total derivatives				$	—					$	(1	)
Total derivatives				$	—					$	(1	)
The following tables show the effect of the Company’s derivative instruments on the Condensed Consolidated Statement of Comprehensive Income and the Condensed Consolidated Statement of Operations for the three and nine months ended March 28, 2014:
(Dollars in millions)


Derivatives Designated as Hedging Instruments		Amount of								Location of		Amount of				Location of	Amount of
		Gain or (Loss)								Gain or (Loss)		Gain or (Loss)				Gain or (Loss)	Gain or (Loss)
		Recognized in OCI								Reclassified from		Reclassified from				Recognized in Income	Recognized in Income
		on Derivative								Accumulated OCI		Accumulated OCI				on Derivative	(Ineffective Portion and
		(Effective Portion)								into Income (Effective Portion)		into Income				(Ineffective Portion and	Amount Excluded from
												(Effective Portion)				Amount Excluded from Effectiveness Testing)	Effectiveness Testing) (a)
		For the Three Months Ended				For the Nine Months Ended						For the Three Months Ended		For the Nine Months Ended			For the Three Months Ended		For the Nine Months Ended
Foreign currency forward exchange contracts		$	1			$	—			Cost of revenue		$	—	$	—	Cost of revenue	$	—	$	—
Foreign currency forward exchange contracts		$	1			$	—			Cost of revenue		$	—	$	—	Cost of revenue	$	—	$	—


Derivatives Not Designated as Hedging Instruments		Location of		Amount of
		Gain or (Loss)		Gain or (Loss)
		Recognized in		Recognized in Income
		Income on		on Derivative
		Derivative
				For the Three Months Ended				For the Nine Months Ended
Foreign currency forward exchange contracts		Other, net		$	1			$	(4	)
Foreign currency forward exchange contracts		Other, net		$	1			$	(4	)
___________________________________________

(a)	The amount of gain or (loss) recognized in income represents $0 million related to the ineffective portion of the hedging relationship and $0 million related to the amount excluded from the assessment of hedge effectiveness for the three and nine months ended March 28, 2014.

The following tables show the effect of the Company’s derivative instruments on the Condensed Consolidated Statement of Comprehensive Income and the Condensed Consolidated Statement of Operations for the three and nine months ended March 29, 2013:
(Dollars in millions)


Derivatives Designated as Hedging Instruments		Amount of								Location of		Amount of				Location of	Amount of
		Gain or (Loss)								Gain or (Loss)		Gain or (Loss)				Gain or (Loss)	Gain or (Loss)
		Recognized in OCI								Reclassified from		Reclassified from				Recognized in Income	Recognized in Income
		on Derivative								Accumulated OCI		Accumulated OCI				on Derivative	(Ineffective Portion and
		(Effective Portion)								into Income (Effective Portion)		into Income				(Ineffective Portion and	Amount Excluded from
												(Effective Portion)				Amount Excluded from Effectiveness Testing)	Effectiveness Testing) (a)
		For the Three Months Ended				For the Nine Months Ended						For the Three Months Ended		For the Nine Months Ended			For the Three Months Ended		For the Nine Months Ended
Foreign currency forward exchange contracts		$	—			$	—			Cost of revenue		$	—	$	—	Cost of revenue	$	—	$	—
Foreign currency forward exchange contracts		$	—			$	—			Cost of revenue		$	—	$	—	Cost of revenue	$	—	$	—


Derivatives Not Designated as Hedging Instruments		Location of		Amount of
		Gain or (Loss)		Gain or (Loss)
		Recognized in		Recognized in Income
		Income on		on Derivative
		Derivative
				For the Three Months Ended				For the Nine Months Ended
Foreign currency forward exchange contracts		Other, net		$	5			$	10
Foreign currency forward exchange contracts		Other, net		$	5			$	10
___________________________________________

(a)	The amount of gain or (loss) recognized in income represents $0 million related to the ineffective portion of the hedging relationship and $0 million related to the amount excluded from the assessment of hedge effectiveness for the three and nine months ended March 29, 2013, respectively.

Fair_Value

Fair Value	9 Months Ended
	Mar. 28, 2014
Fair Value Disclosures [Abstract]	'
Fair Value	'
	Fair Value
	Measurement of Fair Value
	Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability.
	Fair Value Hierarchy
	A fair value hierarchy is based on whether the market participant assumptions used in determining fair value are obtained from independent sources (observable inputs) or reflects the Company’s own assumptions of market participant valuation (unobservable inputs). A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels of inputs that may be used to measure fair value:
	Level 1 — Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities;
	Level 2 — Quoted prices for identical assets and liabilities in markets that are inactive; quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly; or
	Level 3 — Prices or valuations that require inputs that are both unobservable and significant to the fair value measurement.
	The Company considers an active market to be one in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis, and views an inactive market as one in which there are few transactions for the asset or liability, the prices are not current, or price quotations vary substantially either over time or among market makers. Where appropriate the Company’s or the counterparty’s non-performance risk is considered in determining the fair values of liabilities and assets, respectively.
	Items Measured at Fair Value on a Recurring Basis
	The following tables present the Company’s assets and liabilities, by financial instrument type and balance sheet line item, that are measured at fair value on a recurring basis, excluding accrued interest components, as of March 28, 2014:


		Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant				Significant				Total
		Prices in			Other				Unobservable				Balance
		Active			Observable				Inputs
		Markets for			Inputs				(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets:
	Money market funds	$	757		$	—			$	—			$	757

	Commercial paper	—			1,051				—				1,051

	U.S. treasuries and agency bonds	—			—				—				—

	Certificates of deposit	—			128				—				128

	Corporate bonds	—			5				—				5

	Other debt securities	—			—				—				—

	Equity securities	—			—				—				—

	Total cash equivalents and short-term investments	757			1,184				—				1,941

	Restricted cash and investments:
	Mutual Funds	—			—				—				—

	Certificates of deposit	—			4				—				4

	Auction rate securities	—			—				15				15

	Derivative assets	—			—				—				—

	Total assets	$	757		$	1,188			$	15			$	1,960

	Liabilities:
	Derivative liabilities	$	—		$	—			$	—			$	—

	Total return swap	—			—				—				—

	Total liabilities	$	—		$	—			$	—			$	—



		Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant				Significant				Total
		Prices in			Other				Unobservable				Balance
		Active			Observable				Inputs
		Markets for			Inputs				(Level 3)
Identical			(Level 2)
Instruments
(Level 1)
Assets:
Cash and cash equivalents		$	757			$	1,137			$	—			$	1,894

Short-term investments	—			47				—				47

Restricted cash and investments	—			4				—				4

Other current assets	—			—				—				—

Other assets, net	—			—				15				15

Total assets	$	757		$	1,188			$	15			$	1,960

Liabilities:
Accrued expenses	$	—		$	—			$	—			$	—

Total liabilities	$	—		$	—			$	—			$	—

The following tables present the Company’s assets and liabilities, by financial instrument type and balance sheet line item, that are measured at fair value on a recurring basis, excluding accrued interest components, as of June 28, 2013:


	Fair Value Measurements at Reporting Date Using
(Dollars in millions)	Quoted			Significant				Significant				Total
	Prices in			Other				Unobservable				Balance
	Active			Observable				Inputs
	Markets for			Inputs				(Level 3)
	Identical			(Level 2)
	Instruments
	(Level 1)
Assets:
Money market funds	$	787		$	—			$	—			$	787

Commercial paper	—			655				—				655

U.S. treasuries and agency bonds	—			96				—				96

Certificates of deposit	—			149				—				149

Corporate bonds	—			211				—				211

Other debt securities	—			106				—				106

Equity securities	4			—				—				4

Total cash equivalents and short-term investments	791			1,217				—				2,008

Restricted cash and investments:
Mutual Funds	74			—				—				74

Other debt securities	22			5				—				27

Auction rate securities	—			—				15				15

Derivative assets	—			—				—				—

Total assets	$	887		$	1,222			$	15			$	2,124

Liabilities:
Derivative liabilities	$	—		$	(1	)		$	—			$	(1	)

Total liabilities	$	—		$	(1	)		$	—			$	(1	)



	Fair Value Measurements at Reporting Date Using
(Dollars in millions)	Quoted			Significant				Significant				Total
	Prices in			Other				Unobservable				Balance
	Active			Observable				Inputs
	Markets for			Inputs				(Level 3)
	Identical			(Level 2)
	Instruments
	(Level 1)
Assets:
Cash and cash equivalents	$	787		$	741			$	—			$	1,528

Short-term investments	4			476				—				480

Restricted cash and investments	96			5				—				101

Other current assets	—			—				—				—

Other assets, net	—			—				15				15

Total assets	$	887		$	1,222			$	15			$	2,124

Liabilities:
Accrued expenses	$	—		$	(1	)		$	—			$	(1	)

Total liabilities	$	—		$	(1	)		$	—			$	(1	)

Level 1 assets consist of securities for which quoted prices are available in an active market.
The Company classifies items in Level 2 if the financial asset or liability is valued using observable inputs. The Company uses observable inputs including quoted prices in active markets for similar assets or liabilities. Level 2 assets include: agency bonds, corporate bonds, commercial paper, municipal bonds, certificates of deposit, international government securities, asset backed securities, mortgage backed securities and U.S. Treasuries. These debt investments are priced using observable inputs and valuation models which vary by asset class. The Company uses a pricing service to assist in determining the fair values of all of its cash equivalents and short-term investments. For the cash equivalents and short-term investments in the Company’s portfolio, multiple pricing sources are generally available. The pricing service uses inputs from multiple industry standard data providers or other third party sources and various methodologies, such as weighting and models, to determine the appropriate price at the measurement date. The Company corroborates the prices obtained from the pricing service against other independent sources and, as of March 28, 2014, has not found it necessary to make any adjustments to the prices obtained. The Company’s derivative financial instruments are also classified within Level 2. The Company’s derivative financial instruments consist of foreign currency forward exchange contracts. The Company recognizes derivative financial instruments in its condensed consolidated financial statements at fair value. The Company determines the fair value of these instruments by considering the estimated amount it would pay or receive to terminate these agreements at the reporting date.
The Company’s Level 3 assets consist of auction rate securities with a par value of approximately $17 million, all of which are collateralized by student loans guaranteed by the Federal Family Education Loan Program. Beginning in fiscal year 2008, these securities failed to settle at auction and have continued to fail through March 28, 2014. Since there is no active market for these securities, the Company valued them using a discounted cash flow model. The valuation model is based on the income approach and reflects both observable and significant unobservable inputs.
The Company's auction rate securities are measured at fair value on a recurring basis, excluding accrued interest components, using significant unobservable inputs (Level 3). The fair value of the Company's auction rate securities as of March 28, 2014 and June 28, 2013 totaled $15 million and $15 million, respectively.
Items Measured at Fair Value on a Non-Recurring Basis
The Company enters into certain strategic investments for the achievement of business and strategic objectives. Strategic investments in equity securities where the Company does not have the ability to exercise significant influence over the investees, are included in Other assets, net in the Condensed Consolidated Balance Sheets, are recorded at cost and are periodically analyzed to determine whether or not there are indicators of impairment. The carrying value of the Company’s strategic investments at March 28, 2014 and June 28, 2013 totaled $46 million and $66 million, respectively, and consisted primarily of privately held equity securities without a readily determinable fair value.
Other Fair Value Disclosures
The Company’s debt is carried at amortized cost. The fair value of the Company’s debt is derived using the closing price as of the date of valuation, which takes into account the yield curve, interest rates, and other observable inputs. Accordingly, these fair value measurements are categorized as Level 2. The following table presents the fair value and amortized cost of the Company’s debt in order of maturity:


		March 28, 2014							June 28, 2013
(Dollars in millions)		Carrying			Estimated				Carrying				Estimated
		Amount			Fair Value				Amount				Fair Value
6.8% Senior Notes due October 2016		$	334		$	373			$	335			$	370

3.75% Senior Notes due November 2018		800			826				—				—

7.75% Senior Notes due December 2018		238			258				238				259

6.875% Senior Notes due May 2020		572			621				600				644

7.00% Senior Notes due November 2021		570			634				600				645

4.75% Senior Notes due June 2023		1,000			984				1,000				938

Other		—			—				4				4

		3,514			3,696				2,777				2,860

Less short-term borrowings and current portion of long-term debt		—			—				(3		)		(3		)

Long-term debt, less current portion		$	3,514		$	3,696			$	2,774			$	2,857

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Mar. 28, 2014
Equity [Abstract]	'
Shareholders' Equity	'
	Equity
	Share Capital
	The Company’s authorized share capital is $13,500 and consists of 1,250,000,000 ordinary shares, par value $0.00001, of which 326,478,939 shares were outstanding as of March 28, 2014, and 100,000,000 preferred shares, par value $0.00001, of which none were issued or outstanding as of March 28, 2014.
	Ordinary shares—Holders of ordinary shares are entitled to receive dividends when and as declared by the Company’s board of directors (the “Board of Directors”). Upon any liquidation, dissolution, or winding up of the Company, after required payments are made to holders of preferred shares, any remaining assets of the Company will be distributed ratably to holders of the preferred and ordinary shares. Holders of shares are entitled to one vote per share on all matters upon which the ordinary shares are entitled to vote, including the election of directors.
	Preferred shares—The Company may issue preferred shares in one or more series, up to the authorized amount, without shareholder approval. The Board of Directors is authorized to establish from time to time the number of shares to be included in each series, and to fix the rights, preferences and privileges of the shares of each wholly unissued series and any of its qualifications, limitations or restrictions. The Board of Directors can also increase or decrease the number of shares of a series, but not below the number of shares of that series then outstanding, without any further vote or action by the shareholders.
	The Board of Directors may authorize the issuance of preferred shares with voting or conversion rights that could harm the voting power or other rights of the holders of the ordinary shares. The issuance of preferred shares, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring or preventing a change in control of the Company and might harm the market price of its ordinary shares and the voting and other rights of the holders of ordinary shares.
	Repurchases of Equity Securities
	On April 26, 2012, the Board of Directors authorized the Company to repurchase $2.5 billion of its outstanding ordinary shares.
	On July 24, 2013, the Board of Directors authorized the Company to repurchase an additional $2.5 billion of its outstanding ordinary shares.
	All repurchases are effected as redemptions in accordance with the Company’s Articles of Association.
	As of March 28, 2014, $1.5 billion remained available for repurchase under the existing repurchase authorization limit.
	The following table sets forth information with respect to repurchases of the Company’s shares during the nine months ended March 28, 2014:


	(In millions)	Number of	Dollar Value
		Shares	of Shares
		Repurchased	Repurchased
	Repurchased during the three months ended September 27, 2013	4	$	182

	Repurchased during the three months ended December 27, 2013	33	$	1,520

	Repurchased during the three months ended March 28, 2014	4	$	184

	Repurchased during the nine months ended March 28, 2014	41	$	1,886

Compensation

Compensation	9 Months Ended
Compensation	Mar. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Compensation	'
	Compensation
	The Company recorded approximately $30 million and $87 million of stock-based compensation expense during the three and nine months ended March 28, 2014, respectively. The Company recorded approximately $20 million and $56 million of stock-based compensation during the three and nine months ended March 29, 2013, respectively.

Guarantees

Guarantees	9 Months Ended
	Mar. 28, 2014
Guarantees [Abstract]	'
Financial Guarantees and Warranties	'
	Guarantees
	Indemnifications to Officers and Directors
	On May 4, 2009, Seagate Technology, an exempted company incorporated with limited liability under the laws of the Cayman Islands (“Seagate-Cayman”), then the parent company, entered into a new form of indemnification agreement (the “Revised Indemnification Agreement”) with the officers and directors of Seagate-Cayman and its subsidiaries (each, an “Indemnitee”). The Revised Indemnification Agreement provides indemnification in addition to any of Indemnitee's indemnification rights under Seagate-Cayman's Articles of Association, applicable law or otherwise, and indemnifies an Indemnitee for certain expenses (including attorneys' fees), judgments, fines and settlement amounts actually and reasonably incurred by him or her in any action or proceeding, including any action by or in the right of Seagate-Cayman or any of its subsidiaries, arising out of his or her service as a director, officer, employee or agent of Seagate-Cayman or any of its subsidiaries or of any other entity to which he or she provides services at Seagate-Cayman's request. However, an Indemnitee shall not be indemnified under the Revised Indemnification Agreement for (i) any fraud or dishonesty in the performance of Indemnitee's duty to Seagate-Cayman or the applicable subsidiary of Seagate-Cayman or (ii) Indemnitee's conscious, intentional or willful failure to act honestly, lawfully and in good faith with a view to the best interests of Seagate-Cayman or the applicable subsidiary of Seagate-Cayman. In addition, the Revised Indemnification Agreement provides that Seagate-Cayman will advance expenses incurred by an Indemnitee in connection with enforcement of the Revised Indemnification Agreement or with the investigation, settlement or appeal of any action or proceeding against him or her as to which he or she could be indemnified.
	On July 3, 2010 pursuant to a corporate reorganization, the common shareholders of Seagate-Cayman became ordinary shareholders of Seagate Technology plc (the “Company”) and Seagate-Cayman became a wholly-owned subsidiary of the Company, as described more fully in the Current Report on Form 8-K filed by the Company on July 6, 2010 (the “Redomestication”). On July 27, 2010, in connection with the Redomestication, the Company, as sole shareholder of Seagate-Cayman, approved a form of deed of indemnity (the “Deed of Indemnity”), which provides for the indemnification by Seagate-Cayman of any director, officer, employee or agent of the Company, Seagate-Cayman or any subsidiary of the Company (each, a “Deed Indemnitee”), in addition to any applicable indemnification rights under the Company's Articles of Association, applicable law or otherwise, on substantially similar terms as the Revised Indemnification Agreement. Seagate-Cayman entered into the Deed of Indemnity with certain Deed Indemnitees effective as of July 3, 2010 and continues to enter into the Deed of Indemnity with additional Deed Indemnitees from time to time.
	The nature of these indemnification obligations prevents the Company from making a reasonable estimate of the maximum potential amount it could be required to pay on behalf of its officers and directors. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying condensed consolidated financial statements with respect to these indemnification obligations.
	Intellectual Property Indemnification Obligations
	The Company has entered into agreements with customers and suppliers that include limited intellectual property indemnification obligations that are customary in the industry. These guarantees generally require the Company to compensate the other party for certain damages and costs incurred as a result of third party intellectual property claims arising from these transactions. The nature of the intellectual property indemnification obligations prevents the Company from making a reasonable estimate of the maximum potential amount it could be required to pay to its customers and suppliers. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification obligations.
	Product Warranty
	The Company estimates probable product warranty costs at the time revenue is recognized. The Company generally warrants its products for a period of 1 to 5 years. The Company uses estimated repair or replacement costs and uses statistical modeling to estimate product return rates in order to determine its warranty obligation. Changes in the Company’s product warranty liability during the three and nine months ended March 28, 2014 and March 29, 2013 were as follows:


		For the Three Months Ended						For the Nine Months Ended
	(Dollars in millions)	March 28,			March 29,			March 28,			March 29,
		2014			2013			2014			2013
	Balance, beginning of period	$	300		$	330		$	320		$	363

	Warranties issued	43			47			139			144

	Repairs and replacements	(55		)	(59		)	(174		)	(210		)
	Changes in liability for pre-existing warranties, including expirations	(2		)	4			1			22

	Warranty liability assumed from business acquisitions	—			—			—			3

	Balance, end of period	$	286		$	322		$	286		$	322

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Mar. 28, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic earnings per share is computed by dividing income available to shareholders by the weighted-average number of shares outstanding during the period. Diluted earnings per share is computed by dividing income available to shareholders by the weighted-average number of shares outstanding during the period and the number of additional shares that would have been outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include outstanding options, unvested restricted share units and shares to be purchased under the ESPP. The dilutive effect of potentially dilutive securities is reflected in diluted earnings per share by application of the treasury stock method. Under the treasury stock method, an increase in fair market value of the Company’s share price can result in a greater dilutive effect from potentially dilutive securities. The following table sets forth the computation of basic and diluted net income per share attributable to the shareholders of Seagate Technology plc:


		For the Three Months Ended				For the Nine Months Ended
	(In millions, except per share data)	March 28,		March 29,		March 28,		March 29,
		2014		2013		2014		2013
	Numerator:

	Net income attributable to Seagate Technology plc	$	395	$	416	$	1,250	$	1,490

	Number of shares used in per share calculations:

	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	327		358		340		374

	Weighted-average effect of dilutive securities:

	Employee equity award plans	11		11		11		12

	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	338		369		351		386

	Net income per share attributable to Seagate Technology plc shareholders:

	Basic	$	1.21	$	1.16	$	3.68	$	3.98

	Diluted	$	1.17	$	1.13	$	3.56	$	3.86

	The anti-dilutive shares related to employee equity award plans that were excluded from the computation of diluted net income per share attributable to Seagate Technology plc. were immaterial for the three and nine months ended March 28, 2014 and March 29, 2013.

Legal_Environmental_and_Other_

Legal, Environmental and Other Contingencies	9 Months Ended
Legal, Environmental and Other Contingencies	Mar. 28, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Legal, Environmental and Other Contingencies	'
	Legal, Environmental and Other Contingencies
	The Company assesses the probability of an unfavorable outcome of all its material litigation, claims, or assessments to determine whether a liability had been incurred and whether it is probable that one or more future events will occur confirming the fact of the loss. In the event that an unfavorable outcome is determined to be probable and the amount of the loss can be reasonably estimated, the Company establishes an accrual for the litigation, claim or assessment. In addition, in the event an unfavorable outcome is determined to be less than probable, but reasonably possible, the Company will disclose an estimate of the possible loss or range of such loss; however, when a reasonable estimate cannot be made, the Company will provide disclosure to that effect. Litigation is inherently uncertain and may result in adverse rulings or decisions. Additionally, the Company may enter into settlements or be subject to judgments that may, individually or in the aggregate, have a material adverse effect on its results of operations. Accordingly, actual results could differ materially.
	Intellectual Property Litigation
	Convolve, Inc. (“Convolve”) and Massachusetts Institute of Technology (“MIT”) v. Seagate Technology LLC, et al.—On July 13, 2000, Convolve and MIT filed suit against Compaq Computer Corporation and Seagate Technology LLC in the U.S. District Court for the Southern District of New York, alleging infringement of U.S. Patent Nos. 4,916,635, “Shaping Command Inputs to Minimize Unwanted Dynamics” (the “'635 patent”) and U.S. Patent No. 5,638,267, “Method and Apparatus for Minimizing Unwanted Dynamics in a Physical System” (the “'267 patent”), misappropriation of trade secrets, breach of contract, and other claims. In the complaint, the plaintiffs requested injunctive relief, $800 million in compensatory damages and unspecified punitive damages, including for willful infringement and willful and malicious misappropriation. On January 16, 2002, Convolve filed an amended complaint, alleging defendants infringe US Patent No. 6,314,473, “System for Removing Selected Unwanted Frequencies in Accordance with Altered Settings in a User Interface of a Data Storage Device,” (the “'473patent”). The district court ruled in 2010 that the '267 patent was out of the case.
	On August 16, 2011, the district court granted in part and denied in part the Company's motion for summary judgment. On July 1, 2013, the U.S. Court of Appeals for the Federal Circuit: 1) affirmed the district court's summary judgment rulings that Seagate did not misappropriate any of the alleged trade secrets and that the asserted claims of the '635 patent are invalid; 2) reversed and vacated the district court's summary judgment of non-infringement with respect to the '473 patent; and 3) remanded the case for further proceedings on the '473 patent. On March 12, 2014, the district court set a schedule for resolving the remaining issues relating to the ‘473 patent; a pre-trial conference is scheduled for September 10, 2014, and trial is scheduled to begin October 6, 2014. In view of the district court's August 16, 2011 ruling and the Court of Appeals' July 1, 2013 ruling and the uncertainty regarding the amount of damages, if any, that could be awarded Convolve in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	Alexander Shukh v. Seagate Technology—On February 12, 2010, Alexander Shukh filed a complaint against the Company in the U.S. District Court for the District of Minnesota, alleging, among other things, employment discrimination based on his Belarusian national origin and wrongful failure to name him as an inventor on several patents and patent applications. Mr. Shukh's employment was terminated as part of a company-wide reduction in force in fiscal year 2009. He seeks damages in excess of $75 million. The Company believes the claims are without merit and intends to vigorously defend this case. On March 31, 2014, the district court granted Seagate’s summary judgment motion and entered judgment in favor of Seagate. Mr. Shukh filed a notice of appeal on April 7, 2014. In view of the uncertainty regarding the amount of damages, if any, that could be awarded in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	LEAP Co., Ltd. v. Seagate Singapore International Headquarters Pte. Ltd. and Nippon Seagate Inc.—On July 4, 2012, LEAP Co., Ltd. filed a lawsuit in the Tokyo District Court of Japan against Seagate Singapore International Headquarters Pte. Ltd., Nippon Seagate Inc. and Buffalo Inc. alleging wrongful termination of purchase agreements and other claims, and seeking approximately $38 million in damages. A date for the start of trial has not yet been scheduled. The Company believes the claims are without merit and intends to vigorously defend this case. In view of the uncertainty regarding the amount of damages, if any, that could be awarded in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	Realtek Semiconductor Corporation ITC Investigation re Certain Integrated Circuit Chips and Products Containing the Same—On September 19, 2012, Realtek Semiconductor Corporation filed a complaint with the International Trade Commission seeking an investigation pursuant to Section 337 of the Tariff Act of 1930, as amended. The complaint names LSI Corporation and Seagate Technology as respondents and alleges infringement of U.S. patents relating to integrated circuit chips that include bond pad structures. Realtek seeks an order to exclude entry of infringing integrated circuit chips and products containing the infringing integrated circuit chips into the U.S. and a cease and desist order. The ITC initiated an investigation on October 18, 2012. The target date for completion of the investigation is July 17, 2014. On March 21, 2014, the ALJ issued an Initial Determination in favor of Seagate and LSI based on findings that the patent claims at issue are invalid, and that Realtek failed to show the existence of an industry in the U.S. that exploits the patent. In view of the uncertainty regarding the possible outcome of this case and the nature of the relief sought, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible loss or range of loss, or other possible adverse result, if any, that may be incurred with respect to this matter.
	Enova Technology Corporation v. Seagate Technology (US) Holdings, Inc., et al.-On June 5, 2013, Enova Technology Corporation filed a complaint against Seagate Technology (US) Holdings, Inc. and Seagate Technology LLC in the U.S. District Court for the District of Delaware alleging infringement of U.S. Patent No. 7,136,995, “Cryptographic Device,” and U.S. Patent No. 7,900,057, “Cryptographic Serial ATA Apparatus and Method.” The complaint seeks unspecified compensatory damages, enhanced damages, injunctive relief, attorneys' fees, and other relief. A date for the start of trial has not yet been scheduled. The Company believes the claims are without merit and intends to vigorously defend this case. In view of the uncertainty regarding the amount of damages, if any, that could be awarded in this matter, the Company does not believe that it is currently possible to determine a reasonable estimate of the possible range of loss related to this matter.
	Environmental Matters
	The Company's operations are subject to U.S. and foreign laws and regulations relating to the protection of the environment, including those governing discharges of pollutants into the air and water, the management and disposal of hazardous substances and wastes and the cleanup of contaminated sites. Some of the Company's operations require environmental permits and controls to prevent and reduce air and water pollution, and these permits are subject to modification, renewal and revocation by issuing authorities.
	The Company has established environmental management systems and continually updates its environmental policies and standard operating procedures for its operations worldwide. The Company believes that its operations are in material compliance with applicable environmental laws, regulations and permits. The Company budgets for operating and capital costs on an ongoing basis to comply with environmental laws. If additional or more stringent requirements are imposed on the Company in the future, it could incur additional operating costs and capital expenditures.
	Some environmental laws, such as the Comprehensive Environmental Response Compensation and Liability Act of 1980 (as amended, the “Superfund” law) and its state equivalents, can impose liability for the cost of cleanup of contaminated sites upon any of the current or former site owners or operators or upon parties who sent waste to these sites, regardless of whether the owner or operator owned the site at the time of the release of hazardous substances or the lawfulness of the original disposal activity. The Company has been identified as a potentially responsible party at several sites. At each of these sites, the Company has an assigned portion of the financial liability based on the type and amount of hazardous substances disposed of by each party at the site and the number of financially viable parties. The Company has fulfilled its responsibilities at some of these sites and remains involved in only a few at this time.
	While the Company's ultimate costs in connection with these sites is difficult to predict with complete accuracy, based on its current estimates of cleanup costs and its expected allocation of these costs, the Company does not expect costs in connection with these sites to be material.
	The Company may be subject to various state, federal and international laws and regulations governing the environment, including those restricting the presence of certain substances in electronic products. For example, the European Union (“EU”) enacted the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment, which prohibits the use of certain substances, including lead, in certain products, including disk drives, put on the market after July 1, 2006. Similar legislation has been or may be enacted in other jurisdictions, including in the United States, Canada, Mexico, Taiwan, China, Japan and others. The European Union REACH Directive (Registration, Evaluation, Authorization, and Restriction of Chemicals, EC 1907/2006) also restricts substances of very high concern (“SVHCs”) in products. If the Company or its suppliers fails to comply with the substance restrictions, recycle requirements or other environmental requirements as they are enacted worldwide, it could have a materially adverse effect on the Company's business.
	Other Matters
	The Company is involved in a number of other judicial and administrative proceedings incidental to its business, and the Company may be involved in various legal proceedings arising in the normal course of its business in the future. Although occasional adverse decisions or settlements may occur, the Company believes that the final disposition of such matters will not have a material adverse effect on its financial position or results of operations.

Subsequent_Events

Subsequent Events (Subsequent Event [Member])	12 Months Ended
Subsequent Events (Subsequent Event [Member])	Jun. 27, 2014
Subsequent Event [Member]	'
Subsequent Event [Line Items]	'
Subsequent Events	'
	Subsequent Events
	On March 31, 2014, the Company acquired all of the outstanding shares of Xyratex Ltd (“Xyratex”), a leading provider of data storage technology. The Company paid $13.25 per share or approximately $376 million in cash for the acquisition. The acquisition of Xyratex further strengthens the Company's vertically integrated supply and manufacturing chain for disk drives and provides access to important capital requirements, as well as expands the Company's storage solutions portfolio. Because the initial accounting for the acquisition was incomplete at the time this Form 10-Q was filed with the Securities and Exchange Commission, certain disclosures required by ASC Topic 805 — Business Combinations have not been made herein.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Mar. 28, 2014
Accounting Policies [Abstract]	'
Consolidation, Policy	'
	Basis of Presentation and Consolidation
	The unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned and majority-owned subsidiaries, after elimination of intercompany transactions and balances. The preparation of financial statements in accordance with U.S. generally accepted accounting principles also requires management to make estimates and assumptions that affect the amounts reported in the Company’s condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. The methods, estimates and judgments the Company uses in applying its most critical accounting policies have a significant impact on the results the Company reports in its condensed consolidated financial statements. The condensed consolidated financial statements reflect, in the opinion of management, all material adjustments necessary to present fairly the condensed consolidated financial position, results of operations, comprehensive income, cash flows and shareholders’ equity for the periods presented. Such adjustments are of a normal and recurring nature. The Company’s Consolidated Financial Statements for the fiscal year ended June 28, 2013, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 7, 2013. The Company believes that the disclosures included in the unaudited Condensed Consolidated Financial Statements, when read in conjunction with its Consolidated Financial Statements as of June 28, 2013, and the notes thereto, are adequate to make the information presented not misleading.
New Accounting Pronouncements, Policy	'
	In February 2013, the FASB issued ASU No. 2013-02, Comprehensive Income (ASC Topic 220) — Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The ASU requires an entity to report information, either on the face of the statement where net income is presented or in the notes, about the amounts reclassified out of accumulated other comprehensive income by component and to report significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. The ASU has been adopted by the Company effective for the first quarter of fiscal year 2014. Other than requiring additional disclosures, the adoption of this new guidance did not have a material impact on the Company's consolidated financial statements.
	In July, 2013, the FASB issued ASU No. 2013-11, Income Taxes (ASC Topic 740) — Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. The amendments in this ASU provide explicit guidance that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, with limited exceptions. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 and do not require new recurring disclosures. The adoption of this new guidance will not have a material impact on the Company's consolidated financial statements.

Balance_Sheet_Information_Tabl

Balance Sheet Information (Tables)	9 Months Ended															12 Months Ended
	Mar. 28, 2014															Jun. 28, 2013
Disclosure Text Block Supplement [Abstract]	'															'
Summary of fair value and amortized cost of investments, by major type	'															'


	(Dollars in millions)	Amortized			Unrealized			Fair								(Dollars in millions)	Amortized		Unrealized			Fair
		Cost			Gain/(Loss)			Value									Cost		Gain/(Loss)			Value
	Available-for-sale securities:															Available-for-sale securities:

	Money market funds	$	757		$	—		$	757							Money market funds	$	804	$	—		$	804

	Commercial paper	1,051			—			1,051								Commercial paper	655		—			655

	Corporate bonds	5			—			5								Corporate bonds	211		—			211

	U.S. treasuries and agency bonds	—			—			—								U.S. treasuries and agency bonds	96		—			96

	Certificates of deposit	132			—			132								Certificates of deposit	154		—			154

	Auction rate securities	17			(2		)	15								Auction rate securities	17		(2		)	15

	Equity securities	—			—			—								Equity Securities	4		—			4

	Other debt securities	—			—			—								Other debt securities	107		(1		)	106

		1,962			(2		)	1,960									2,048		(3		)	2,045

	Trading securities	—			—			—								Trading securities	74		5			79

	Total	$	1,962		$	(2	)	$	1,960							Total	$	2,122	$	2		$	2,124


	Included in Cash and cash equivalents							$	1,894							Included in Cash and cash equivalents						$	1,528

	Included in Short-term investments							47								Included in Short-term investments						480

	Included in Restricted cash and investments							4								Included in Restricted cash and investments						101

	Included in Other assets, net							15								Included in Other assets, net						15

	Total							$	1,960							Total						$	2,124

Fair value and amortized cost of available-for-sale securities by contractual maturity	'															'


	(Dollars in millions)	Amortized			Fair
		Cost			Value
	Due in less than 1 year	$	1,945		$	1,945

	Due in 1 to 5 years	—			—

	Thereafter	17			15

	Total	$	1,962		$	1,960

Inventories	'															'


	(Dollars in millions)	March 28,			June 28,
		2014			2013
	Raw materials and components	$	246		$	213

	Work-in-process	260			231

	Finished goods	340			410

		$	846		$	854

Other Current Assets	'															'


	(Dollars in millions)	March 28,			June 28,
		2014			2013
	Vendor non-trade receivables	$	124		$	329

	Other	122			155

		$	246		$	484

Property, Equipment and Leasehold Improvements, net	'															'


	(Dollars in millions)	March 28,			June 28,
		2014			2013
	Property, equipment and leasehold improvements	$	8,807		$	8,544

	Accumulated depreciation and amortization	(6,742		)	(6,275		)
		$	2,065		$	2,269

Schedule of accumulated other comprehensive income (loss)	'															'


	(Dollars in millions)	Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Marketable Securities (a)			Unrealized Gains (Losses) on post-retirements			Foreign currency translation adjustments		Total
	Balance at June 28, 2013	$	—		$	(3	)	$	(10	)	$	—	$	(13	)

	Other comprehensive income before reclassifications	—			1			1			9		11

	Amounts reclassified from AOCI	—			—			—			—		—

	Other comprehensive income	—			1			1			9		11

	Balance at March 28, 2014	$	—		$	(2	)	$	(9	)	$	9	$	(2	)


	Balance at June 29, 2012	$	—		$	(1	)	$	(8	)	$	—	$	(9	)

	Other comprehensive income before reclassifications	—			34			—			—		34

	Amounts reclassified from AOCI	—			(18		)	—			—		(18		)

	Other comprehensive income	—			16			—			—		16

	Balance at March 29, 2013	$	—		$	15		$	(8	)	$	—	$	7

	___________________________________________
	(a)The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt_Tables

Debt (Tables)	9 Months Ended
	Mar. 28, 2014
Debt Disclosure [Abstract]	'
Future principal payments on long-term debt	'


	Fiscal Year	Amount
	Remainder of 2014	$	—

	2015	—

	2016	—

	2017	334

	2018	—

	Thereafter	3,180

		$	3,514

Acquisitions_Tables

Acquisitions (Tables) (LaCie S.A. [Member])	9 Months Ended
	Mar. 28, 2014
LaCie S.A. [Member]	'
Business Acquisition [Line Items]	'
Fair value of assets acquired and liabilities assumed	'


	(Dollars in millions)	Amount
	Cash and cash equivalents	$	71

	Accounts receivable	29

	Marketable securities	27

	Inventories	46

	Other current and non-current assets	19

	Property, plant and equipment	12

	Intangible assets	45

	Goodwill	13

	Total assets	262

	Accounts payable and accrued expenses	(73		)
	Current and non-current portion of long-term debt	(6		)
	Total liabilities	(79		)
	Noncontrolling interest	(72		)
	Total	$	111

Fair value of finite-lived intangible assets acquired	'


	(Dollars in millions)		Fair Value		Weighted-
					Average
					Amortization
					Period
	Customer relationships		$	31	5.0 years

	Existing technology		1		5.0 years

	Trade name		13		5.0 years

	Total acquired identifiable intangible assets		$	45

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	9 Months Ended										12 Months Ended
	Mar. 28, 2014										Jun. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'										'
Changes in the carrying amount of goodwill	'										'


	(Dollars in millions)	Amount
	Balance at June 28, 2013	$	476

	Foreign currency translation effect	1

	Balance at March 28, 2014	$	477

Carrying value of intangible assets	'										'


	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average	(Dollars in millions)	Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life		Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	138	$	(137	)	$	1	3.3 years	Existing technology	$	138	$	(105	)	$	33	0.5 years

	Customer relationships		432		(172		)	260		3.5 years	Customer relationships	431		(114		)	317		4.3 years

	Trade name		15		(5		)	10		3.3 years	Trade Name	14		(3		)	11		4.1 years

	In-process research and development (a)		44		(11		)	33		1.2 years	Total amortizable other intangible assets	$	583	$	(222	)	$	361	3.9 years

	Total amortizable other intangible assets		$	629	$	(325	)	$	304	3.3 years

	___________________________________________
	(a) During the December 2013 quarter, the in-process research and development was completed, and the related asset was accounted for as a finite-lived intangible asset.
Expected amortization expense for acquisition-related intangible assets	'										'


	(Dollars in millions)	Amount
	Remainder of 2014	$	26

	2015	102

	2016	79

	2017	69

	2018	28

	Thereafter	—

		$	304

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	9 Months Ended
Derivative Financial Instruments (Tables)	Mar. 28, 2014																					Mar. 29, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'																					'
Schedule of notional value of outstanding foreign currency forward exchange contracts	'																					'


			As of March 28, 2014
	(Dollars in millions)		Contracts				Contracts Not
			Designated as				Designated as
			Hedges				Hedges
	Thai baht		$	—			$	20
	Thai baht		$	—			$	20
	Singapore dollars		33				18
	Singapore dollars		33				18
	Chinese renminbi		—				—
	Chinese renminbi		—				—
			$	33			$	38
			$	33			$	38



			As of June 28, 2013
	(Dollars in millions)		Contracts				Contracts Not
			Designated as				Designated as
			Hedges				Hedges
	Thai baht		$	—			$	20
	Thai baht		$	—			$	20
	Singapore dollars		—				—
	Singapore dollars		—				—
	Chinese renminbi		—				—
	Chinese renminbi		—				—
	Czech koruna		—				—
	Czech koruna		—				—
			$	—			$	20
			$	—			$	20
Schedule of gross fair value of derivative instruments	'																					'


			As of March 28, 2014
			Asset Derivatives						Liability Derivatives
	(Dollars in millions)		Balance Sheet		Fair Value				Balance Sheet		Fair Value
	(Dollars in millions)		Location		Fair Value				Location		Fair Value
	Derivatives designated as hedging instruments:
	Derivatives designated as hedging instruments:
	Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
	Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
	Derivatives not designated as hedging instruments:
	Derivatives not designated as hedging instruments:
	Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		—
	Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		—
	Total return swap		Other current assets		—				Accrued expenses		—
	Total return swap		Other current assets		—				Accrued expenses		—
	Total derivatives				$	—					$	—
	Total derivatives				$	—					$	—



			As of June 28, 2013
			Asset Derivatives						Liability Derivatives
	(Dollars in millions)		Balance Sheet		Fair Value				Balance Sheet		Fair Value
	(Dollars in millions)		Location		Fair Value				Location		Fair Value
	Derivatives designated as hedging instruments:
	Derivatives designated as hedging instruments:
	Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
	Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	—
	Derivatives not designated as hedging instruments:
	Derivatives not designated as hedging instruments:
	Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		(1		)
	Foreign currency forward exchange contracts		Other current assets		—				Accrued expenses		(1		)
	Total derivatives				$	—					$	(1	)
	Total derivatives				$	—					$	(1	)
Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations	'																					'
	(Dollars in millions)																					(Dollars in millions)


	Derivatives Designated as Hedging Instruments		Amount of								Location of		Amount of				Location of	Amount of				Derivatives Designated as Hedging Instruments		Amount of								Location of	Amount of				Location of	Amount of
			Gain or (Loss)								Gain or (Loss)		Gain or (Loss)				Gain or (Loss)	Gain or (Loss)						Gain or (Loss)								Gain or (Loss)	Gain or (Loss)				Gain or (Loss)	Gain or (Loss)
			Recognized in OCI								Reclassified from		Reclassified from				Recognized in Income	Recognized in Income						Recognized in OCI								Reclassified from	Reclassified from				Recognized in Income	Recognized in Income
			on Derivative								Accumulated OCI		Accumulated OCI				on Derivative	(Ineffective Portion and						on Derivative								Accumulated OCI	Accumulated OCI				on Derivative	(Ineffective Portion and
			(Effective Portion)								into Income (Effective Portion)		into Income				(Ineffective Portion and	Amount Excluded from						(Effective Portion)								into Income (Effective Portion)	into Income				(Ineffective Portion and	Amount Excluded from
													(Effective Portion)				Amount Excluded from Effectiveness Testing)	Effectiveness Testing) (a)															(Effective Portion)				Amount Excluded from Effectiveness Testing)	Effectiveness Testing) (a)
			For the Three Months Ended				For the Nine Months Ended						For the Three Months Ended		For the Nine Months Ended			For the Three Months Ended		For the Nine Months Ended				For the Three Months Ended				For the Nine Months Ended					For the Three Months Ended		For the Nine Months Ended			For the Three Months Ended		For the Nine Months Ended
	Foreign currency forward exchange contracts		$	1			$	—			Cost of revenue		$	—	$	—	Cost of revenue	$	—	$	—	Foreign currency forward exchange contracts		$	—			$	—			Cost of revenue	$	—	$	—	Cost of revenue	$	—	$	—
	Foreign currency forward exchange contracts		$	1			$	—			Cost of revenue		$	—	$	—	Cost of revenue	$	—	$	—	Foreign currency forward exchange contracts		$	—			$	—			Cost of revenue	$	—	$	—	Cost of revenue	$	—	$	—


	Derivatives Not Designated as Hedging Instruments		Location of		Amount of																	Derivatives Not Designated as Hedging Instruments		Location of		Amount of
			Gain or (Loss)		Gain or (Loss)																			Gain or (Loss)		Gain or (Loss)
			Recognized in		Recognized in Income																			Recognized in		Recognized in Income
			Income on		on Derivative																			Income on		on Derivative
			Derivative																					Derivative
					For the Three Months Ended				For the Nine Months Ended																	For the Three Months Ended				For the Nine Months Ended
	Foreign currency forward exchange contracts		Other, net		$	1			$	(4	)											Foreign currency forward exchange contracts		Other, net		$	5			$	10
	Foreign currency forward exchange contracts		Other, net		$	1			$	(4	)											Foreign currency forward exchange contracts		Other, net		$	5			$	10
	___________________________________________																					___________________________________________

	(a)	The amount of gain or (loss) recognized in income represents $0 million related to the ineffective portion of the hedging relationship and $0 million related to the amount excluded from the assessment of hedge effectiveness for the three and nine months ended March 28, 2014.																				(a)	The amount of gain or (loss) recognized in income represents $0 million related to the ineffective portion of the hedging relationship and $0 million related to the amount excluded from the assessment of hedge effectiveness for the three and nine months ended March 29, 2013, respectively.

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended															12 Months Ended
	Mar. 28, 2014															Jun. 28, 2013
Fair Value Disclosures [Abstract]	'															'
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	'															'


		Fair Value Measurements at Reporting Date Using															Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant			Significant				Total				(Dollars in millions)	Quoted		Significant			Significant		Total
		Prices in			Other			Unobservable				Balance					Prices in		Other			Unobservable		Balance
		Active			Observable			Inputs									Active		Observable			Inputs
		Markets for			Inputs			(Level 3)									Markets for		Inputs			(Level 3)
		Identical			(Level 2)												Identical		(Level 2)
		Instruments															Instruments
		(Level 1)															(Level 1)
	Assets:															Assets:
	Money market funds	$	757		$	—		$	—			$	757			Money market funds	$	787	$	—		$	—	$	787

	Commercial paper	—			1,051			—				1,051				Commercial paper	—		655			—		655

	U.S. treasuries and agency bonds	—			—			—				—				U.S. treasuries and agency bonds	—		96			—		96

	Certificates of deposit	—			128			—				128				Certificates of deposit	—		149			—		149

	Corporate bonds	—			5			—				5				Corporate bonds	—		211			—		211

	Other debt securities	—			—			—				—				Other debt securities	—		106			—		106

	Equity securities	—			—			—				—				Equity securities	4		—			—		4

	Total cash equivalents and short-term investments	757			1,184			—				1,941				Total cash equivalents and short-term investments	791		1,217			—		2,008

	Restricted cash and investments:															Restricted cash and investments:
	Mutual Funds	—			—			—				—				Mutual Funds	74		—			—		74

	Certificates of deposit	—			4			—				4				Other debt securities	22		5			—		27

	Auction rate securities	—			—			15				15				Auction rate securities	—		—			15		15

	Derivative assets	—			—			—				—				Derivative assets	—		—			—		—

	Total assets	$	757		$	1,188		$	15			$	1,960			Total assets	$	887	$	1,222		$	15	$	2,124

	Liabilities:															Liabilities:
	Derivative liabilities	$	—		$	—		$	—			$	—			Derivative liabilities	$	—	$	(1	)	$	—	$	(1	)

	Total return swap	—			—			—				—				Total liabilities	$	—	$	(1	)	$	—	$	(1	)

	Total liabilities	$	—		$	—		$	—			$	—

Schedule of Fair Value, by Balance Sheet Grouping, Measured on Recurring Basis	'															'


		Fair Value Measurements at Reporting Date Using															Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant			Significant				Total				(Dollars in millions)	Quoted		Significant			Significant		Total
		Prices in			Other			Unobservable				Balance					Prices in		Other			Unobservable		Balance
		Active			Observable			Inputs									Active		Observable			Inputs
		Markets for			Inputs			(Level 3)									Markets for		Inputs			(Level 3)
		Identical			(Level 2)												Identical		(Level 2)
		Instruments															Instruments
		(Level 1)															(Level 1)
	Assets:															Assets:
	Cash and cash equivalents	$	757		$	1,137		$	—			$	1,894			Cash and cash equivalents	$	787	$	741		$	—	$	1,528

	Short-term investments	—			47			—				47				Short-term investments	4		476			—		480

	Restricted cash and investments	—			4			—				4				Restricted cash and investments	96		5			—		101

	Other current assets	—			—			—				—				Other current assets	—		—			—		—

	Other assets, net	—			—			15				15				Other assets, net	—		—			15		15

	Total assets	$	757		$	1,188		$	15			$	1,960			Total assets	$	887	$	1,222		$	15	$	2,124

	Liabilities:															Liabilities:
	Accrued expenses	$	—		$	—		$	—			$	—			Accrued expenses	$	—	$	(1	)	$	—	$	(1	)

	Total liabilities	$	—		$	—		$	—			$	—			Total liabilities	$	—	$	(1	)	$	—	$	(1	)

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	'															'


			March 28, 2014						June 28, 2013
	(Dollars in millions)		Carrying			Estimated			Carrying				Estimated
			Amount			Fair Value			Amount				Fair Value
	6.8% Senior Notes due October 2016		$	334		$	373		$	335			$	370

	3.75% Senior Notes due November 2018		800			826			—				—

	7.75% Senior Notes due December 2018		238			258			238				259

	6.875% Senior Notes due May 2020		572			621			600				644

	7.00% Senior Notes due November 2021		570			634			600				645

	4.75% Senior Notes due June 2023		1,000			984			1,000				938

	Other		—			—			4				4

			3,514			3,696			2,777				2,860

	Less short-term borrowings and current portion of long-term debt		—			—			(3		)		(3		)

	Long-term debt, less current portion		$	3,514		$	3,696		$	2,774			$	2,857

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	9 Months Ended
	Mar. 28, 2014
Equity [Abstract]	'
Schedule of Share Repurchases	'


	(In millions)	Number of	Dollar Value
		Shares	of Shares
		Repurchased	Repurchased
	Repurchased during the three months ended September 27, 2013	4	$	182

	Repurchased during the three months ended December 27, 2013	33	$	1,520

	Repurchased during the three months ended March 28, 2014	4	$	184

	Repurchased during the nine months ended March 28, 2014	41	$	1,886

Guarantees_Tables

Guarantees (Tables)	9 Months Ended
	Mar. 28, 2014
Guarantees [Abstract]	'
Schedule of Product Warranty Liability	'


		For the Three Months Ended						For the Nine Months Ended
	(Dollars in millions)	March 28,			March 29,			March 28,			March 29,
		2014			2013			2014			2013
	Balance, beginning of period	$	300		$	330		$	320		$	363

	Warranties issued	43			47			139			144

	Repairs and replacements	(55		)	(59		)	(174		)	(210		)
	Changes in liability for pre-existing warranties, including expirations	(2		)	4			1			22

	Warranty liability assumed from business acquisitions	—			—			—			3

	Balance, end of period	$	286		$	322		$	286		$	322

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Mar. 28, 2014
Earnings Per Share [Abstract]	'
Schedule of computation of basic and diluted net income (loss) per share	'


		For the Three Months Ended				For the Nine Months Ended
	(In millions, except per share data)	March 28,		March 29,		March 28,		March 29,
		2014		2013		2014		2013
	Numerator:

	Net income attributable to Seagate Technology plc	$	395	$	416	$	1,250	$	1,490

	Number of shares used in per share calculations:

	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	327		358		340		374

	Weighted-average effect of dilutive securities:

	Employee equity award plans	11		11		11		12

	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	338		369		351		386

	Net income per share attributable to Seagate Technology plc shareholders:

	Basic	$	1.21	$	1.16	$	3.68	$	3.98

	Diluted	$	1.17	$	1.13	$	3.56	$	3.86

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013	Jun. 27, 2014	Jun. 28, 2013
Schedule of Fiscal Years [Line Items]	'	'	'	'	'	'
Number of Weeks in Fiscal Year	'	'	'	'	'52	'52
Number Of Weeks In Quarter	'13	'13	'39	'39	'	'
Minimum [Member]	'	'	'	'	'	'
Schedule of Fiscal Years [Line Items]	'	'	'	'	'	'
Number of Weeks in Fiscal Year	'	'	'	'	'52	'52
Maximum [Member]	'	'	'	'	'	'
Schedule of Fiscal Years [Line Items]	'	'	'	'	'	'
Number of Weeks in Fiscal Year	'	'	'	'	'53	'53

Balance_Sheet_Information_Bala

Balance Sheet Information Balance Sheet Information (Narrative) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Investments, Debt and Equity Securities [Abstract]	'	'
Cash and investments held as collateral at banks for various performance obligations	$4	$22
Restricted Cash and Investments Held in Trust	'	79
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Pretax	0	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	'
Available-for-sale Securities, Cost Basis of Other-than-temporarily Imparied Securities	$0	'

Balance_Sheet_Information_Summ

Balance Sheet Information (Summary of fair value and amortized cost of investments, by major type)(Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	$1,962	$2,048
Available-for-sale securities, Unrealized Gain/(Loss)	-2	-3
Available-for-sale securities, Fair Value	1,960	2,045
Trading securities	'	'
Trading securities, Amortized Cost	0	74
Trading securities, Unrealized gain/(loss)	0	5
Trading securities, Fair Value	0	79
Total available-for-sale and trading securities	'	'
Investments, Total Amortized Cost	1,962	2,122
Investments, Total Unrealized Gain/(Loss)	-2	2
Investments, Total Fair Value	1,960	2,124
Included in Short-term investments	47	480
Included in Restricted cash and investments	4	101
Investments, Total Fair Value	1,960	2,124
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Total available-for-sale and trading securities	'	'
Investments, Total Fair Value	1,960	2,124
Included in Cash and cash equivalents	1,894	1,528
Included in Short-term investments	47	480
Included in Restricted cash and investments	4	101
Included in Other assets, net	15	15
Investments, Total Fair Value	1,960	2,124
Money market funds [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	757	804
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	757	804
Commercial paper [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	1,051	655
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	1,051	655
Corporate bonds [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	5	211
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	5	211
U.S. treasuries and agency bonds [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	0	96
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	0	96
Certificates of deposit [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	132	154
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	132	154
Auction rate securities [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	17	17
Available-for-sale securities, Unrealized Gain/(Loss)	-2	-2
Available-for-sale securities, Fair Value	15	15
Equity securities [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	0	4
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	0	4
Other debt securities [Member]	'	'
Available-for-sale securities:	'	'
Available-for-sale securities, Amortized Cost	0	107
Available-for-sale securities, Unrealized Gain/(Loss)	0	-1
Available-for-sale securities, Fair Value	$0	$106

Balance_Sheet_Information_Fair

Balance Sheet Information (Fair value and amortized cost of available-for-sale securities by contractual maturity) (Details) (USD $)	Mar. 28, 2014
In Millions, unless otherwise specified	Mar. 28, 2014
Amortized Cost	'
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis	$1,945
AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortize	0
AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost	17
Total Amortized Cost	1,962
Fair Value	'
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value	1,945
Available-for-sale Securities, Debt Maturities, after One Through Five Years, at Fair Value	0
Available-for-sale Securities, Debt Maturities, after Five Years Fair Value	15
Total Fair Value	$1,960

Balance_Sheet_Information_Inve

Balance Sheet Information (Inventories) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Inventory, Net [Abstract]	'	'
Raw materials and components	$246	$213
Work-in-process	260	231
Finished goods	340	410
Total inventories	$846	$854

Balance_Sheet_Information_Bala1

Balance Sheet Information Balance Sheet Information (Other Current Assets) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Other Current Assets [Abstract]	'	'
Vendor non-trade receivables	$124	$329
Other	122	155
Total other current assets	$246	$484

Balance_Sheet_Information_Prop

Balance Sheet Information (Property, Equipment and Leasehold Improvements, net) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Property, Plant and Equipment, Net [Abstract]	'	'
Property, equipment and leasehold improvements	$8,807	$8,544
Accumulated depreciation and amortization	-6,742	-6,275
Total property, equipment and leasehold improvements, net	$2,065	$2,269

Balance_Sheet_Information_Accu

Balance Sheet Information (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014		Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Unrealized Gains (Losses) on Cash Flow Hedges	'		'	'	'
Beginning Balance	'		'	$0	$0
Other comprehensive income before reclassifications	1		0	0	0
Amounts reclassified from AOCI	0		0	0	0
Other comprehensive income	1		0	0	0
Ending Balance	0		0	0	0
Unrealized Gains (Losses) on Marketable Securities (a)	'		'	'	'
Beginning Balance	'		'	-3	-1
Other comprehensive income before reclassifications	0		11	1	34
Amounts reclassified from AOCI	0	[1]	19	0	18	[1]
Other comprehensive income	0		-8	1	16
Ending Balance	-2		15	-2	15
Unrealized Gains (Losses) on post-retirements	'		'	'	'
Beginning Balance	'		'	-10	-8
Other comprehensive income before reclassifications	0		0	1	0
Amounts reclassified from AOCI	0		0	0	0
Other comprehensive income	0		0	1	0
Ending Balance	-9		-8	-9	-8
Foreign currency translation adjustments	'		'	'	'
Beginning Balance	'		'	0	0
Other comprehensive income before reclassifications	'		'	9	0
Amounts reclassified from AOCI	'		'	0	0
Other comprehensive income	4		-3	9	0
Ending Balance	9		0	9	0
Total	'		'	'	'
Beginning Balance	'		'	-13	-9
Other comprehensive income before reclassifications	'		'	11	34
Amounts reclassified from AOCI	'		'	0	-18
Total other comprehensive income (loss), net of tax	5		-11	11	16
Ending Balance	($2)		$7	($2)	$7

[1]	The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt_Narrative_Details

Debt (Narrative) (Details) (USD $)

9 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Mar. 28, 2014

Mar. 29, 2013

Apr. 30, 2013

Jan. 18, 2011

Mar. 28, 2014

Jun. 28, 2013

Aug. 03, 2012

Senior Notes 3.75 Percent due November 2018 [Member]

Senior Notes 6.8 Percent due October 2016 [Member]

Senior Notes 7.75 Percent Due December 2018 [Member]

Senior Notes 6.875 Percent due May 2020 [Member]

Senior Notes 7.00 Percent Due November 2021 [Member]

Senior Notes 4.75 Percent Due June 2023 [Member]

Other Debt [Member]

LaCie S.A. [Member]

Debt Instrument [Line Items]

Line of Credit Facility, Maximum Borrowing Capacity

$500

$350

Sub-limit for issuance of letters of credit under revolving credit facility

Line of Credit Facility Letters of Credit Outstanding

Aggregate principal amount

800

600

750

600

1,000

Stated interest rate (as a percent)

3.75%

6.80%

7.75%

6.88%

7.00%

4.75%

Repayment of Long-term Debt

Loss on redemption and repurchase of debt

Redemption price as percentage of principal amount (percent)

100.00%

Basis spread on variable rate (basis points)

50.00%

Long-term debt assumed from LaCie

Long-term debt assumed from LaCie, Current Maturities

Debt_Future_principal_payments

Debt (Future principal payments on long-term debt) (Details) (USD $)	Mar. 28, 2014
In Millions, unless otherwise specified	Mar. 28, 2014
Debt Disclosure [Abstract]	'
Remainder of 2014	$0
2015	0
2016	0
2017	334
2018	0
Thereafter	3,180
Total future principal payments on long-term debt	$3,514

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'	'	'
(Benefit from) provision for income taxes	($5)	$14	$22	$38
Discrete tax (benefits) charges	-14	4	-7	5
Domestic federal statutory rate (as a percent)	25.00%	25.00%	25.00%	25.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	'	'	45	'
Unrecognized Tax Benefits	112	'	112	'
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	'	'	55	'
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	'	'	3	'
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	'	'	13	'
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	112	'	112	'
Minimum [Member]	'	'	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	0	'	0	'
Maximum [Member]	'	'	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'	'	'
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$55	'	$55	'

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details)	9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Aug. 03, 2012	Sep. 28, 2012	Mar. 28, 2014	Mar. 29, 2013	Aug. 03, 2012
	USD ($)	USD ($)	LaCie S.A. [Member]	LaCie S.A. [Member]	LaCie S.A. [Member]	LaCie S.A. [Member]	LaCie S.A. [Member]
			USD ($)	USD ($)	USD ($)	USD ($)	EUR (€)
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Business Acquisition Number Of Shares Acquired	'	'	23,382,904	'	'	'	'
Business Acquisition, Percentage of Voting Interests Acquired	'	'	64.50%	'	'	'	'
Business Acquisition Costs Of Acquired Entity Cash Paid Per Share	'	'	'	'	'	'	€ 4.05
Business Acquisition, Contingent Consideration Per Share	'	'	'	'	'	'	€ 0.12
Business Acquisition, Contingent Consideration Threshold (Percent)	'	'	95.00%	'	'	'	'
Business Acquisition, Contingent Consideration Condition Must Be Reached (Period)	'	'	'6 months	'	'	'	'
Business Acquisition Prepaid Compensation Cost At Fair Vaule	'	'	'	'	'	'	€ 9
Business Acquisition Prepaid Compensation Cost Performance Period	'	'	'36 months	'	'	'	'
Total purchase price	'	'	111	'	'	'	'
Cash paid for consideration	'	'	107	'	'	'	'
Business Acquisition, Contingent Consideration, Potential Cash Payment	'	'	4	'	'	'	'
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	'	'	'	'	1	'	'
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	'	'	'	'	'	4	'
Noncontrolling Interest, Payment For Deposit To Acquire Noncontrolling Shares	$0	$72	'	($72)	'	'	'

Acquisitions_Fair_Value_Of_Ass

Acquisitions (Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013	Aug. 03, 2012
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013	LaCie S.A. [Member]
Business Acquisition [Line Items]	'	'	'
Cash and cash equivalents	'	'	$71
Accounts receivable	'	'	29
Marketable securities	'	'	27
Inventories	'	'	46
Other current and non-current assets	'	'	19
Property, plant and equipment	'	'	12
Intangible assets	'	'	45
Goodwill	477	476	13
Total assets	'	'	262
Accounts payable and accrued expenses	'	'	-73
Current and non-current portion of long-term debt	'	'	-6
Total liabilities	'	'	79
Noncontrolling interest	'	'	-72
Total	'	'	$111

Acquisitions_Fair_Value_Of_Fin

Acquisitions (Fair Value Of Finite-Lived Intangible Assets Acquired) (Details) (LaCie S.A. [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Aug. 03, 2012
Intangible assets acquired	'
Acquired identifiable intangible asset, Amount	$45
Customer relationships [Member]	'
Intangible assets acquired	'
Acquired identifiable intangible asset, Amount	31
Acquired identifiable intangible asset, Weighted Average Useful Life	'5 years
Existing technology [Member]	'
Intangible assets acquired	'
Acquired identifiable intangible asset, Amount	1
Acquired identifiable intangible asset, Weighted Average Useful Life	'5 years
Trade name [Member]	'
Intangible assets acquired	'
Acquired identifiable intangible asset, Amount	$13
Acquired identifiable intangible asset, Weighted Average Useful Life	'5 years

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'
Amortization of intangibles	$26	$37	$103	$110

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Changes in the carrying amount of goodwill) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014
Goodwill [Roll Forward]	'
Goodwill, Beginning Balance	$476
Foreign currency translation effect	1
Goodwill, Ending Balance	$477

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Carrying value of intangible assets) (Details) (USD $)	9 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014		Jun. 28, 2013
Intangible assets acquired	'		'
Gross Carrying Amount	$629		$583
Accumulated Amortization	-325		-222
Net Carrying Amount	304		361
Weighted Average Remaining Useful Life (in years)	'3 years 3 months 0 days		'3 years 10 months 24 days
Existing technology [Member]	'		'
Intangible assets acquired	'		'
Gross Carrying Amount	138		138
Accumulated Amortization	-137		-105
Net Carrying Amount	1		33
Weighted Average Remaining Useful Life (in years)	'3 years 4 months 0 days		'5 months 24 days
Customer relationships [Member]	'		'
Intangible assets acquired	'		'
Gross Carrying Amount	432		431
Accumulated Amortization	-172		-114
Net Carrying Amount	260		317
Weighted Average Remaining Useful Life (in years)	'3 years 6 months 0 days		'4 years 3 months 24 days
Trade name [Member]	'		'
Intangible assets acquired	'		'
Gross Carrying Amount	15		14
Accumulated Amortization	-5		-3
Net Carrying Amount	10		11
Weighted Average Remaining Useful Life (in years)	'3 years 4 months 0 days		'4 years 1 month 24 days
In-process research and development (a) [Member]	'		'
Intangible assets acquired	'		'
Gross Carrying Amount	44	[1]	'
Accumulated Amortization	-11		'
Net Carrying Amount	$33		'
Weighted Average Remaining Useful Life (in years)	'1 year 2 months 0 days		'

[1]	During the December 2013 quarter, the in-process research and development was completed, and the related asset was accounted for as a finite-lived intangible asset.

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets (Expected amortization expense for acquisition-related intangible assets) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'
Remainder of 2014	$26	'
2015	102	'
2016	79	'
2017	69	'
2018	28	'
Thereafter	0	'
Total	$304	$361

Derivative_Financial_Instrumen2

Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) (Total Return Swap [Member], USD $)	Mar. 28, 2014
In Millions, unless otherwise specified	Mar. 28, 2014
Total Return Swap [Member]	'
Derivative Financial Instruments	'
Notional value of total return swap	$88

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Schedule of notional value of outstanding foreign currency forward exchange contracts) (Details) (Foreign currency forward exchange contracts [Member], USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Derivatives designated as hedging instruments [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	$33	$0
Derivatives designated as hedging instruments [Member] \| Thai baht [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives designated as hedging instruments [Member] \| Singapore dollars [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	33	0
Derivatives designated as hedging instruments [Member] \| Chinese Renminbi [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives designated as hedging instruments [Member] \| Czech koruna [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	'	0
Derivatives not designated as hedging instruments [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	38	20
Derivatives not designated as hedging instruments [Member] \| Thai baht [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	20	20
Derivatives not designated as hedging instruments [Member] \| Singapore dollars [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	18	0
Derivatives not designated as hedging instruments [Member] \| Chinese Renminbi [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives not designated as hedging instruments [Member] \| Czech koruna [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	'	$0

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Schedule of gross fair value of derivative instruments) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	$0	$0
Liability derivatives, Accrued expenses	0	-1
Derivatives designated as hedging instruments [Member] \| Foreign currency forward exchange contracts [Member]	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	0
Liability derivatives, Accrued expenses	0	0
Derivatives not designated as hedging instruments [Member] \| Foreign currency forward exchange contracts [Member]	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	0
Liability derivatives, Accrued expenses	0	-1
Derivatives not designated as hedging instruments [Member] \| Total Return Swap [Member]	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	'
Liability derivatives, Accrued expenses	$0	'

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations) (Details) (Foreign currency forward exchange contracts [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Derivatives Instruments, Gain (Loss)	'	'	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	$1	$5	($4)	$10
Cash Flow Hedges [Member]	'	'	'	'
Derivatives Instruments, Gain (Loss)	'	'	'	'
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	1	0	0	0
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	0	0	0
Amount of Gain or (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) (a)	0	0	0	0
Gain or (loss) recognized in income, ineffective portion of hedging relationship	0	0	0	0
Gain or (loss) recognized in income, amount excluded from assessment of hedge effectiveness	'	$0	$0	$0

Fair_Value_Narrative_Details

Fair Value (Narrative) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation	'	'
Cost Method Investments	$46	$66
Significant Unobservable Inputs (Level 3) [Member] \| Auction rate securities [Member]	'	'
Auction rate securities	'	'
Par value of securities	17	'
Balance, beginning of period	15	15
Balance, end of period	$15	$15

Fair_Value_Schedule_of_Fair_Va

Fair Value (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	$4	$101
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	757	791
Restricted cash and investments	0	96
Auction rate securities	0	0
Total Assets	757	887
Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	757	787
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| U.S. treasuries and agency bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0	'
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	'	22
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Equity securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	4
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Mutual Funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	74
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Auction rate securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Auction rate securities	0	0
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	0
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	0
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	'
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,184	1,217
Restricted cash and investments	4	5
Auction rate securities	0	0
Total Assets	1,188	1,222
Derivative liabilities	0	-1
Total Liabilities	0	-1
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,051	655
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| U.S. treasuries and agency bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	96
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	128	149
Restricted cash and investments	4	'
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	5	211
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	106
Restricted cash and investments	'	5
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Equity securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Mutual Funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	0
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Auction rate securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Auction rate securities	0	0
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	0
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	-1
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	'
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0	0
Auction rate securities	15	15
Total Assets	15	15
Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| U.S. treasuries and agency bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0	'
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	'	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Equity securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Mutual Funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Auction rate securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Auction rate securities	15	15
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	0
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	'
Recurring basis [Member] \| Fair Value, Total Balance [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,941	2,008
Restricted cash and investments	4	101
Auction rate securities	15	15
Total Assets	1,960	2,124
Derivative liabilities	0	-1
Total Liabilities	0	-1
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Money market funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	757	787
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Commercial paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,051	655
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| U.S. treasuries and agency bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	96
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Certificates of deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	128	149
Restricted cash and investments	4	'
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Corporate bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	5	211
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Other debt securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	106
Restricted cash and investments	'	27
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Equity securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	4
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Mutual Funds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	74
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Auction rate securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Auction rate securities	15	15
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	0
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	0	-1
Recurring basis [Member] \| Fair Value, Total Balance [Member] \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative liabilities	$0	'

Fair_Value_Schedule_of_Fair_Va1

Fair Value (Schedule of Fair Value, by Balance Sheet Grouping, Measured on Recurring Basis) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Assets and liabilities measured at fair value on a recurring basis	'	'
Short-term investments	$47	$480
Restricted cash and investments	4	101
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	757	787
Short-term investments	0	4
Restricted cash and investments	0	96
Other current assets	0	0
Auction rate securities	0	0
Total Assets	757	887
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	1,137	741
Short-term investments	47	476
Restricted cash and investments	4	5
Other current assets	0	0
Auction rate securities	0	0
Total Assets	1,188	1,222
Accrued expenses - Derivative liabilities	0	-1
Total Liabilities	0	-1
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	0	0
Short-term investments	0	0
Restricted cash and investments	0	0
Other current assets	0	0
Auction rate securities	15	15
Total Assets	15	15
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] \| Fair Value, Total Balance [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	1,894	1,528
Short-term investments	47	480
Restricted cash and investments	4	101
Other current assets	0	0
Auction rate securities	15	15
Total Assets	1,960	2,124
Accrued expenses - Derivative liabilities	0	-1
Total Liabilities	$0	($1)

Fair_Value_Schedule_of_Carryin

Fair Value (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) (USD $)	Mar. 28, 2014	Jun. 28, 2013
In Millions, unless otherwise specified	Mar. 28, 2014	Jun. 28, 2013
Debt Fair Value Disclosures	'	'
Long-term Debt and Capital Lease Obligations, Current	$0	($3)
Long-term debt, less current portion	3,514	2,774
Carrying Amount [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	3,514	2,777
Long-term Debt and Capital Lease Obligations, Current	0	-3
Long-term debt, less current portion	3,514	2,774
Carrying Amount [Member] \| Senior Notes 6.8 Percent due October 2016 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	334	335
Carrying Amount [Member] \| Senior Notes 3.75 Percent due November 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	800	0
Carrying Amount [Member] \| Senior Notes 7.75 Percent Due December 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	238	238
Carrying Amount [Member] \| Senior Notes 6.875 Percent due May 2020 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	572	600
Carrying Amount [Member] \| Senior Notes 7.00 Percent Due November 2021 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	570	600
Carrying Amount [Member] \| Senior Notes 4.75 Percent Due June 2023 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	1,000	1,000
Carrying Amount [Member] \| Other Debt [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	0	4
Fair Value, Total Balance [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	3,696	2,860
Long-term Debt and Capital Lease Obligations, Current	0	-3
Long-term debt, less current portion	3,696	2,857
Fair Value, Total Balance [Member] \| Senior Notes 6.8 Percent due October 2016 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	373	370
Fair Value, Total Balance [Member] \| Senior Notes 3.75 Percent due November 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	826	0
Fair Value, Total Balance [Member] \| Senior Notes 7.75 Percent Due December 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	258	259
Fair Value, Total Balance [Member] \| Senior Notes 6.875 Percent due May 2020 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	621	644
Fair Value, Total Balance [Member] \| Senior Notes 7.00 Percent Due November 2021 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	634	645
Fair Value, Total Balance [Member] \| Senior Notes 4.75 Percent Due June 2023 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	984	938
Fair Value, Total Balance [Member] \| Other Debt [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	$0	$4

Shareholders_Equity_Narrative_

Shareholders' Equity (Narrative) (Details) (USD $)	9 Months Ended	1 Months Ended
	Mar. 28, 2014	Apr. 30, 2012	Jul. 31, 2013
	Mar. 28, 2014	April2012ShareRepurchaseProgram [Member]	July2013ShareRepurchaseProgram [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Authorized share capital (in dollars)	$13,500	'	'
Ordinary shares, authorized	1,250,000,000	'	'
Ordinary shares, par value (in dollars per share)	$0.00	'	'
Ordinary shares, outstanding	326,478,939	'	'
Preferred shares, authorized	100,000,000	'	'
Preferred shares, par value (in dollars per share)	$0.00	'	'
Preferred Stock Minimum Number of Series	1	'	'
Stock Repurchase Program, Authorized Amount	'	2,500,000,000	2,500,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$1,500,000,000	'	'

Shareholders_Equity_Schedule_o

Shareholders' Equity (Schedule of Share Repurchases) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Mar. 28, 2014
Equity [Abstract]	'	'	'	'
Stock Repurchased and Retired During Period, Shares	4	33	4	41
Stock Repurchased and Retired During Period, Value	$184	$1,520	$182	$1,886

Compensation_Narrative_Details

Compensation (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'	'
Share-based compensation	$30	$20	$87	$56

Guarantees_Guarantees_Narrativ

Guarantees Guarantees (Narrative) (Details)	9 Months Ended
	Mar. 28, 2014
	Y
Guarantees [Abstract]	'
Product Warranty Period Term, Minimum	1
Product Warranty Period Term, Maximum	5

Guarantees_Product_Warranty_De

Guarantees (Product Warranty) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Guarantees [Abstract]	'	'	'	'
Balance, beginning of period	$300	$330	$320	$363
Warranties issued	43	47	139	144
Repairs and replacements	-55	-59	-174	-210
Changes in liability for pre-existing warranties, including expirations	-2	4	1	22
Warranty liability assumed from business acquisitions	0	0	0	3
Balance, end of period	$286	$322	$286	$322

Earnings_Per_Share_Schedule_of

Earnings Per Share (Schedule of computation of basic and diluted net income (loss) per share) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 28, 2014	Mar. 29, 2013	Mar. 28, 2014	Mar. 29, 2013
Numerator:	'	'	'	'
Net income attributable to Seagate Technology plc	$395	$416	$1,250	$1,490
Number of shares used in per share calculations:	'	'	'	'
Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	327	358	340	374
Weighted-average effect of dilutive securities:	'	'	'	'
Employee equity award plans	11	11	11	12
Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	338	369	351	386
Net income per share attributable to Seagate Technology plc ordinary shareholders:	'	'	'	'
Basic net income per share (in dollars per share)	$1.21	$1.16	$3.68	$3.98
Diluted net income per share (in dollars per share)	$1.17	$1.13	$3.56	$3.86

Legal_Environmental_and_Other_1

Legal, Environmental and Other Contingencies (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 28, 2014
Convolve and MIT Litigation [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Compensatory Damages Sought	$800
Alexander Shukh Litigation [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency Damages Sought Amount in Excess	75
LEAP Co., Ltd. [Member]	'
Loss Contingencies [Line Items]	'
Loss Contingency, Damages Sought, Value	$38

Subsequent_Events_Narrative_De

Subsequent Events (Narrative) (Details) (Subsequent Event [Member], Xyratex Ltd [Member], USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 27, 2014	Mar. 31, 2014
Subsequent Event [Member] \| Xyratex Ltd [Member]	'	'
Subsequent Event [Line Items]	'	'
Business Acquisition Costs Of Acquired Entity Cash Paid Per Share	'	$13.25
Cash paid for consideration	$376	'