Seagate Technology (STX) 10-Q28 Jan 142014 Q2 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
Document and Entity Information	Dec. 27, 2013	Jan. 24, 2014
Document And Entity Information	'	'
Entity Registrant Name	'Seagate Technology plc	'
Entity Central Index Key	'0001137789	'
Document Type	'10-Q	'
Document Period End Date	27-Dec-13	'
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	'	328,755,155
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Current assets :	'	'
Cash and cash equivalents	$2,293	$1,708
Available-for-sale Securities	46	480
Restricted cash and investments	4	101
Accounts receivable, net	1,615	1,670
Inventories	948	854
Deferred income taxes	116	115
Other current assets	267	484
Total current assets	5,289	5,412
Property, equipment and leasehold improvements, net	2,128	2,269
Goodwill	477	476
Other intangible assets	329	405
Deferred income taxes	465	456
Other assets, net	202	225
Total Assets	8,890	9,243
Current liabilities:	'	'
Accounts payable	1,577	1,690
Accrued employee compensation	267	335
Accrued warranty	158	176
Accrued expenses	455	407
Long-term Debt and Capital Lease Obligations, Current	0	3
Total current liabilities	2,457	2,611
Long-term accrued warranty	141	144
Long-term accrued income taxes	103	87
Other non-current liabilities	122	121
Long-term Debt and Capital Lease Obligations	3,572	2,774
Total Liabilities	6,395	5,737
Ordinary shares and additional paid-in capital	5,404	5,286
Accumulated other comprehensive loss	-7	-13
Accumulated deficit	-2,902	-1,778
Total Shareholders' Equity	2,495	3,495
Stockholders' Equity Attributable to Noncontrolling Interest	0	11
Total Equity	2,495	3,506
Total Liabilities and Shareholders' Equity	$8,890	$9,243

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012
Revenue, Net	$3,528	$3,668	$7,017	$7,400
Cost of Goods and Services Sold	2,541	2,676	5,055	5,347
Research and Development Expense	312	277	606	545
Selling, General and Administrative Expense	190	139	371	289
AmortizationOfIntangibleAssetsExcludingAmountIncludedInCostOfRevenue	25	20	45	39
Restructuring Charges	16	1	18	1
Total operating expenses	3,084	3,113	6,095	6,221
Income from operations	444	555	922	1,179
Investment Income, Interest	1	2	6	4
Interest expense	-49	-55	-93	-111
Other, net	46	-3	47	27
Other expense, net	-2	-56	-40	-80
Income before income taxes	442	499	882	1,099
Provision for income taxes	14	7	27	25
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	428	492	855	1,074
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	0	0
Net Income (Loss) Attributable to Parent	$428	$492	'	$1,074
Net income per share:	'	'	'	'
Basic (in dollars per share)	$1.27	$1.33	$2.46	$2.81
Diluted (in dollars per share)	$1.24	$1.30	$2.39	$2.73
Number of shares used in per share calculations:	'	'	'	'
Basic (in shares)	336	369	347	382
Diluted (in shares)	346	379	357	394
Cash dividends declared per share (in dollars per share)	$0.43	$0.70	$0.81	$1.02

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended			6 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013		Dec. 28, 2012	Dec. 27, 2013		Dec. 28, 2012
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$428		$492	$855		$1,074
Other comprehensive income before reclassifications	-2		0	-1		0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]	'		'	'		'
Amounts reclassified from AOCI	0		'	0		0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	-2		0	-1		0
Other comprehensive income before reclassifications	0		-4	1	[1]	23	[1]
Amounts reclassified from AOCI	0	[1]	2	0		1	[1]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0		-2	1	[1]	24	[1]
Other comprehensive income before reclassifications	1		0	1		0
Amounts reclassified from AOCI	0		'	0		0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1		0	1		0
Other comprehensive income before reclassifications	0		2	5		3
Other comprehensive income	-1		0	6		27
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	427		492	861		1,101
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0		0	0		1
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$427		$492	$861		$1,100

[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 $)	6 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012
OPERATING ACTIVITIES	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$855	$1,074
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	457	430
Share-based Compensation	57	36
Deferred income taxes	-15	-11
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	32	33
Gain (Loss) on Sale of Property Plant Equipment	4	8
Gains (Losses) on Extinguishment of Debt	0	6
Other non-cash operating activities, net	8	5
Changes in operating assets and liabilities:	'	'
Restricted Stock	104	0
Accounts receivable, net	51	683
Inventories	-94	156
Accounts payable	-46	-496
Accrued employee compensation	-68	-62
Accrued expenses, income taxes and warranty	41	-97
Increase (Decrease) in Other Receivables	199	305
Other assets and liabilities	25	-12
Net cash provided by operating activities	1,538	1,976
INVESTING ACTIVITIES	'	'
Acquisition of property, equipment and leasehold improvements	-304	-427
Proceeds from the sale of property and equipment	0	4
Proceeds from Sale of Other Assets	72	42
Purchases of short-term investments	-87	-168
Sales of short-term investments	463	125
Maturities of short-term investments	61	21
Payments to Acquire Businesses, Net of Cash Acquired	0	-36
Payments for (Proceeds from) Other Investing Activities	28	14
Net cash used in investing activities	177	-453
FINANCING ACTIVITIES	'	'
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	0	58
Proceeds from Issuance of Long-term Debt	791	0
Payments for Repurchase of Common Stock	-1,702	-1,510
Dividends to shareholders	-277	-377
Proceeds from issuance of ordinary shares under employee stock plans	61	168
Noncontrolling Interest, Payment For Deposit To Acquire Noncontrolling Shares	0	-72
Other financing activities, net	-5	0
Net cash used in financing activities	-1,132	-1,849
Effect of Exchange Rate on Cash and Cash Equivalents	2	2
Decrease in cash and cash equivalents	585	-324
Cash and cash equivalents at the beginning of the period	1,708	1,707
Cash and cash equivalents at the end of the period	$2,293	$1,383

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)	Total	Common Stock Shares	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Parent	Noncontrolling Interest
In Millions, unless otherwise specified	USD ($)	Common Stock Shares	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)
Equity, Beginning balance at Jun. 28, 2013	$3,506	'	$0	$5,286	($13)	($1,778)	$3,495	$11
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'	'
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	855	'	'	'	'	855	855	0
Other Comprehensive Income (Loss), Net of Tax	6	'	'	'	5	0	5	1
Issuance of ordinary shares under employee stock plans	61	'	0	61	0	0	61	0
Issuance of ordinary shares under employee stock plans	'	6	'	'	'	'	'	'
Repurchases of ordinary shares	-1,702	'	'	'	'	-1,702	-1,702	0
Repurchases of ordinary shares (in shares)	-37	-37	'	'	'	'	'	'
Dividends to shareholders	-277	'	'	'	'	-277	-277	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	57	'	'	57	'	'	57	0
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	-11	'	'	'	1	'	1	-12
Equity, Ending balance at Dec. 27, 2013	2,495	'	0	5,404	-7	-2,902	2,495	0
Noncontrolling Interest Equity, Ending Balance at Dec. 27, 2013	0	'	'	'	'	'	'	'
Parent Equity, Ending Balance at Dec. 27, 2013	$2,495	'	'	'	'	'	'	'
Balance (in shares) at Dec. 27, 2013	'	328	'	'	'	'	'	'

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Dec. 27, 2013
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 accounting principles generally accepted in the United States 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 six months ended December 27, 2013, 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 months ended December 27, 2013 and December 28, 2012 each consisted of 13 weeks. 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	6 Months Ended
	Dec. 27, 2013
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 December 27, 2013:


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

	Money market funds		$	970		$	—			$	970

	Commercial paper		909			—				909

	Corporate bonds		5			—				5

	U.S. treasuries and agency bonds		—			—				—

	Certificates of deposit		131			—				131

	Auction rate securities		17			(2		)		15

	Equity securities		—			—				—

	Other debt securities		—			—				—

			2,032			(2		)		2,030

	Trading securities		—			—				—

	Total		$	2,032		$	(2	)		$	2,030


	Included in Cash and cash equivalents									$	1,965

	Included in Short-term investments									46

	Included in Restricted cash and investments									4

	Included in Other assets, net									15

	Total									$	2,030


	As of December 27, 2013, 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 as restrictions on the cash and investments were removed during the quarter.

	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 December 27, 2013. 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 December 27, 2013, 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 December 27, 2013.

	The fair value and amortized cost of the Company’s investments classified as available-for-sale at December 27, 2013, by remaining contractual maturity were as follows:


	(Dollars in millions)		Amortized			Fair
			Cost			Value
	Due in less than 1 year		$	2,015		$	2,015

	Due in 1 to 5 years		—			—

	Thereafter		17			15

	Total		$	2,032		$	2,030


Equity securities which do not have a contractual maturity date are not included in the above table.

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 available-for-sale securities were other-than-temporarily impaired as of June 28, 2013.

Inventories


(Dollars in millions)		December 27,			June 28,
		2013			2013
Raw materials and components		$	254		$	213

Work-in-process		255			231

Finished goods		439			410

		$	948		$	854


Other Current Assets


(Dollars in millions)		December 27,			June 28,
		2013			2013
Vendor non-trade receivables		$	130		$	329

Other		137			155

		$	267		$	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


(Dollars in millions)		December 27,			June 28,
		2013			2013
Property, equipment and leasehold improvements		$	8,727		$	8,544

Accumulated depreciation and amortization		(6,599		)	(6,275		)
		$	2,128		$	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 as of June 28, 2013		$	—		$	(3	)		$	(10	)	$	—	$	(13	)

Other comprehensive income before reclassifications		(1		)	1				1			5		6

Amounts reclassified from AOCI		—			—				—			—		—

Other comprehensive income		(1		)	1				1			5		6

Balance as of December 27, 2013		$	(1	)	$	(2	)		$	(9	)	$	5	$	(7	)


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

Other comprehensive income before reclassifications		—			23				—			3		26

Amounts reclassified from AOCI		—			1				—			—		1

Other comprehensive income		—			24				—			3		27

Balance as of December 28, 2012		$	—		$	23			$	(8	)	$	3	$	18

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

Debt

Debt	6 Months Ended
	Dec. 27, 2013
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 December 27, 2013, no borrowings had been drawn under the Revolving Credit Facility, and $2 million had been 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 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.

	$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.

	$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 during the three months ended December 27, 2013. The outstanding balance at June 28, 2013 was $3 million and was classified as Current portion of long-term debt.

	At December 27, 2013, future principal payments on long-term debt were as follows (in millions):


	Fiscal Year
	Remainder of 2014	$	—

	2015	—

	2016	—

	2017	334

	2018	—

	Thereafter	3,238

		$	3,572

Income_Taxes

Income Taxes	6 Months Ended
Income Taxes	Dec. 27, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes

	The Company recorded an income tax provision of $14 million and $27 million in the three and six months ended December 27, 2013, respectively. The income tax provision recorded for the three and six months ended December 27, 2013 included approximately $4 million and $6 million, respectively, of net discrete tax expense primarily related to increases in income tax reserves recorded for non-U.S. income positions taken in prior fiscal years offset by the tax benefits from the reversal of a portion of the U.S. valuation allowance recorded in prior periods and tax benefits associated with 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 six months ended December 27, 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.

	The IRS and Treasury Department on September 13, 2013, released final regulations under Sections 162(a) and 263(a) on the deduction and capitalization of expenditures related to tangible personal property (the final repair regulations). The entirety of the final repair regulations apply to the Company’s first quarter of fiscal year 2015. Application of these regulations is not expected to have a material impact on the Company’s consolidated financial statements.

	During the six months ended December 27, 2013, the Company's unrecognized tax benefits excluding interest and penalties increased by $16 million to $173 million. The unrecognized tax benefits that, if recognized, would impact the effective tax rate was $173 million at December 27, 2013, subject to certain future valuation allowance reversals. During the 12 months beginning December 28, 2013, the Company expects to reduce its unrecognized tax benefits by approximately zero to $30 million primarily as a result of the completion of various audit cycles and the expiration of certain statutes of limitation.

	The income tax provision of $7 million recorded for the three months ended December 28, 2012 included approximately $6 million of discrete tax benefits primarily from the release of tax reserves associated with the expiration of certain statutes of limitation. The income tax provision of $25 million recorded for the six months ended December 28, 2012 included approximately $1 million of net discrete tax expense primarily associated with the reversal of prior period tax benefits 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 six months ended December 28, 2012 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	6 Months Ended
	Dec. 27, 2013
Acquisitions	'
Business Combination Disclosure [Text Block]	'
	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):


	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	6 Months Ended
	Dec. 27, 2013
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 three months ended December 27, 2013, are as follows:


	(Dollars in millions)
	Balance as of June 28, 2013	$	476

	Foreign currency translation effect	1

	Balance as of December 27, 2013	$	477


	The carrying value of other intangible assets subject to amortization as of December 27, 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	$	(137	)	$	1	3.6 years

	Customer relationships		431		(152		)	279		3.8 years

	Trade name		14		(4		)	10		3.6 years

	In-process research and development (a)		44		(5		)	39		1.5 years

	Total amortizable other intangible assets		$	627	$	(298	)	$	329	3.5 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 six months ended December 27, 2013, amortization expense of other intangible assets was $39 million and $76 million, respectively. For the three and six months ended December 28, 2012, amortization expense of other intangible assets was $37 million and $73 million. As of December 27, 2013, expected amortization expense for other intangible assets for each of the next five years and thereafter is as follows:



	(Dollars in millions)
	Remainder of 2014	$	52

	2015	102

	2016	79

	2017	68

	2018	28

	Thereafter	—

	$	329

Derivative_Financial_Instrumen

Derivative Financial Instruments	6 Months Ended
Derivative Financial Instruments	Dec. 27, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities Disclosure [Text Block]	'
	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 December 27, 2013 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 material net gains or losses related to the loss of hedge designation on discontinued cash flow hedges during the three and six months ended December 27, 2013. As of December 27, 2013, 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 December 27, 2013 and June 28, 2013:


			As of December 27, 2013
	(Dollars in millions)		Contracts				Contracts Not
			Designated as				Designated as
			Hedges				Hedges
	Thai baht		$	—			$	18
	Thai baht		$	—			$	18
	Singapore dollars		97				21
	Singapore dollars		97				21
	Chinese renminbi		—				—
	Chinese renminbi		—				—
			$	97			$	39
			$	97			$	39



			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 December 27, 2013, the notional investments underlying the TRS amounted to $87 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 December 27, 2013 and June 28, 2013:



			As of December 27, 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		$	(1	)
	Foreign currency forward exchange contracts		Other current assets		$	—			Accrued expenses		$	(1	)
	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 return swap				—						—
	Total return swap				—						—
	Total derivatives				$	—					$	(2	)
	Total derivatives				$	—					$	(2	)



		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 six months ended December 27, 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 Six Months Ended						For the Three Months Ended		For the Six Months Ended			For the Three Months Ended		For the Six 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 Six Months Ended
Foreign currency forward exchange contracts		Other, net		$	(4	)		$	(5	)
___________________________________________
(a)The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three and six months ended December 27, 2013.

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 six months ended December 28, 2012:

(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 Six Months Ended						For the Three Months Ended		For the Six Months Ended			For the Three Months Ended		For the Six 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 Six Months Ended
Foreign currency forward exchange contracts		Other, net		$	1			$	3
Foreign currency forward exchange contracts		Other, net		$	1			$	3
___________________________________________
(a)The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three and six months ended December 28, 2012, respectively.

Fair_Value

Fair Value	6 Months Ended
	Dec. 27, 2013
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 table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis, excluding accrued interest components, as of December 27, 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	$	970		$	—			$	—			$	970

	Commercial paper	—			909				—				909

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

	Certificates of deposit	—			127				—				127

	Corporate bonds	—			5				—				5

	Other debt securities	—			—				—				—

	Equity securities	—			—				—				—

	Total cash equivalents and short-term investments	970			1,041				—				2,011

	Restricted cash and investments:
	Mutual Funds	—			—				—				—

	Certificates of deposit	—			4				—				4

	Auction rate securities	—			—				15				15

	Derivative assets	—			—				—				—

	Total assets	$	970		$	1,045			$	15			$	2,030

	Liabilities:
	Derivative liabilities	$	—		$	(2	)		$	—			$	(2	)

Total return swap	—			—				—				—

Total liabilities	$	—		$	(2	)		$	—			$	(2	)



	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	$	970		$	995			$	—			$	1,965

Short-term investments	—			46				—				46

Restricted cash and investments	—			4				—				4

Other current assets	—			—				—				—

Other assets, net	—			—				15				15

Total assets	$	970		$	1,045			$	15			$	2,030

Liabilities:
Accrued expenses	$	—		$	(2	)		$	—			$	(2	)

Total liabilities	$	—		$	(2	)		$	—			$	(2	)



The following table presents the Company’s assets and liabilities 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 December 27, 2013, 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 December 27, 2013. 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 December 27, 2013 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 December 27, 2013 and June 28, 2013 totaled $44 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:



		December 27, 2013							June 28, 2013
(Dollars in millions)		Carrying			Estimated				Carrying				Estimated
		Amount			Fair Value				Amount				Fair Value
6.8% Senior Notes due October 2016		$	334		$	378			$	335			$	370

3.75% Senior Notes due November 2018		800			811				—				—

7.75% Senior Notes due December 2018		238			261				238				259

6.875% Senior Notes due May 2020		600			649				600				644

7.00% Senior Notes due November 2021		600			664				600				645

4.75% Senior Notes due June 2023		1,000			937				1,000				938

Other		—			—				4				4

		3,572			3,700				2,777				2,860

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

Long-term debt, less current portion		$	3,572		$	3,700			$	2,774			$	2,857

Shareholders_Equity

Shareholders' Equity	6 Months Ended
	Dec. 27, 2013
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 328,474,485 shares were outstanding as of December 27, 2013, and 100,000,000 preferred shares, par value $0.00001, of which none were issued or outstanding as of December 27, 2013.

	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 December 27, 2013, $1.7 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 six months ended December 27, 2013:


	(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 six months ended December 27, 2013	37	$	1,702

Compensation

Compensation	6 Months Ended
Compensation	Dec. 27, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Compensation	'
	Compensation

	The Company recorded approximately $30 million and $57 million of stock-based compensation expense during the three and six months ended December 27, 2013, respectively. The Company recorded approximately $19 million and $36 million of stock-based compensation during the three and six months ended December 28, 2012, respectively.

Guarantees

Guarantees	6 Months Ended
	Dec. 27, 2013
Guarantees [Abstract]	'
Guarantees	'
	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 its 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 of a Deed Indemnitee's indemnification rights under the Company's Articles of Association, applicable law or otherwise, with a similar scope to 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 six months ended December 27, 2013 and December 28, 2012 were as follows:


		For the Three Months Ended						For the Six Months Ended
	(Dollars in millions)	December 27,			December 28,			December 27,			December 28,
		2013			2012			2013			2012
	Balance, beginning of period	$	318		$	337		$	320		$	363

	Warranties issued	48			50			96			98

	Repairs and replacements	(61		)	(67		)	(119		)	(151		)
	Changes in liability for pre-existing warranties, including expirations	(5		)	10			3			17

	Warranty liability assumed from business acquisitions	—			—			—			3

	Balance, end of period	$	300		$	330		$	300		$	330

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Dec. 27, 2013
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 Six Months Ended
	(In millions, except per share data)	December 27,		December 28,		December 27,		December 28,
		2013		2012		2013		2012
	Numerator:

	Net income attributable to Seagate Technology plc	$	428	$	492	$	855	$	1,074

	Number of shares used in per share calculations:

	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	336		369		347		382

	Weighted-average effect of dilutive securities:

	Employee equity award plans	10		10		10		12

	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	346		379		357		394

	Net income per share attributable to Seagate Technology plc shareholders:

	Basic	$	1.27	$	1.33	$	2.46	$	2.81

	Diluted	$	1.24	$	1.3	$	2.39	$	2.73


	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 six months ended December 27, 2013 and December 28, 2012.

Legal_Environmental_and_Other_

Legal, Environmental and Other Contingencies	6 Months Ended
Legal, Environmental and Other Contingencies	Dec. 27, 2013
Legal, Environmental and Other Contingencies	'
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 October 29, 2013, Convolve filed a petition for writ of certiorari with the U.S. Supreme Court, seeking review of the Court of Appeals’ decision with respect to one of the trade secrets. The Supreme Court denied Convolve’s petition on December 9, 2013. 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. A date for the start of trial has not yet been scheduled. 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. 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.

Balance_Sheet_Information_Tabl

Balance Sheet Information (Tables)	6 Months Ended
	Dec. 27, 2013
Disclosure Text Block Supplement [Abstract]	'
Summary of fair value and amortized cost of investments, by major type	'


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

	Money market funds		$	970			$	—			$	970

	Commercial paper		909				—				909

	Corporate bonds		5				—				5

	U.S. treasuries and agency bonds		—				—				—

	Certificates of deposit		131				—				131

	Auction rate securities		17				(2		)		15

	Equity securities		—				—				—

	Other debt securities		—				—				—

			2,032				(2		)		2,030

	Trading securities		—				—				—

	Total		$	2,032			$	(2	)		$	2,030


	Included in Cash and cash equivalents										$	1,965

	Included in Short-term investments										46

	Included in Restricted cash and investments										4

	Included in Other assets, net										15

	Total										$	2,030



	(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

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		$	2,015			$	2,015

	Due in 1 to 5 years		—				—

	Thereafter		17				15

	Total		$	2,032			$	2,030

Inventories	'


	(Dollars in millions)		December 27,				June 28,
			2013				2013
	Raw materials and components		$	254			$	213

	Work-in-process		255				231

	Finished goods		439				410

			$	948			$	854

Other Current Assets	'


	(Dollars in millions)		December 27,				June 28,
			2013				2013
	Vendor non-trade receivables		$	130			$	329

	Other		137				155

			$	267			$	484

Property, Equipment and Leasehold Improvements, net	'


	(Dollars in millions)		December 27,				June 28,
			2013				2013
	Property, equipment and leasehold improvements		$	8,727			$	8,544

	Accumulated depreciation and amortization		(6,599		)		(6,275		)
			$	2,128			$	2,269

Schedule of accumulated other comprehensive income (loss)	'
	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 as of June 28, 2013		$	—			$	(3	)		$	(10	)	$	—	$	(13	)

	Other comprehensive income before reclassifications		(1		)		1				1			5		6

	Amounts reclassified from AOCI		—				—				—			—		—

	Other comprehensive income		(1		)		1				1			5		6

	Balance as of December 27, 2013		$	(1	)		$	(2	)		$	(9	)	$	5	$	(7	)


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

	Other comprehensive income before reclassifications		—				23				—			3		26

	Amounts reclassified from AOCI		—				1				—			—		1

	Other comprehensive income		—				24				—			3		27

	Balance as of December 28, 2012		$	—			$	23			$	(8	)	$	3	$	18

	___________________________________________
	(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)	6 Months Ended
	Dec. 27, 2013
Debt Disclosure [Abstract]	'
Future principal payments on long-term debt	'


	Fiscal Year
	Remainder of 2014	$	—

	2015	—

	2016	—

	2017	334

	2018	—

	Thereafter	3,238

		$	3,572

Acquisitions_Tables

Acquisitions (Tables)	6 Months Ended
	Dec. 27, 2013
Business Acquisition [Line Items]	'
Schedule of Purchase Price Allocation [Table Text Block]	'


	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 the separately identifiable intangible assets at the time of acquisition	'


	(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)	3 Months Ended			6 Months Ended
	Dec. 27, 2013			Dec. 27, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'			'
Changes in the carrying amount of goodwill by reporting units	'			'


	(Dollars in millions)
	Balance as of June 28, 2013	$	476

	Foreign currency translation effect	1

	Balance as of December 27, 2013	$	477

Carrying value of intangible assets	'			'
				The carrying value of other intangible assets subject to amortization as of December 27, 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	$	(137	)	$	1	3.6 years

				Customer relationships		431		(152		)	279		3.8 years

				Trade name		14		(4		)	10		3.6 years

				In-process research and development (a)		44		(5		)	39		1.5 years

				Total amortizable other intangible assets		$	627	$	(298	)	$	329	3.5 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

Expected amortization expense for acquisition-related intangible assets	'			'


				(Dollars in millions)
				Remainder of 2014	$	52

				2015	102

				2016	79

				2017	68

				2018	28

				Thereafter	—

					$	329

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	6 Months Ended
Derivative Financial Instruments (Tables)	Dec. 27, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of notional value of outstanding foreign currency forward exchange contracts	'


		As of December 27, 2013
	(Dollars in millions)	Contracts				Contracts Not
		Designated as				Designated as
		Hedges				Hedges
	Thai baht	$	—			$	18
	Thai baht	$	—			$	18
	Singapore dollars	97				21
	Singapore dollars	97				21
	Chinese renminbi	—				—
	Chinese renminbi	—				—
		$	97			$	39
		$	97			$	39
Schedule of gross fair value of derivative instruments	'


		As of December 27, 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		$	(1	)
	Foreign currency forward exchange contracts	Other current assets		$	—			Accrued expenses		$	(1	)
	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 return swap			—						—
	Total return swap			—						—
	Total derivatives			$	—					$	(2	)
	Total derivatives			$	—					$	(2	)



		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) OCI and the Consolidated Statement of Operations	'
	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 six months ended December 28, 2012:

	(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 Six Months Ended						For the Three Months Ended		For the Six Months Ended			For the Three Months Ended		For the Six 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 Six Months Ended
	Foreign currency forward exchange contracts	Other, net		$	1			$	3
	Foreign currency forward exchange contracts	Other, net		$	1			$	3
	___________________________________________
	(a)The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three and six months ended December 28, 2012, respectively.
	(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 Six Months Ended						For the Three Months Ended		For the Six Months Ended			For the Three Months Ended		For the Six 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 Six Months Ended
	Foreign currency forward exchange contracts	Other, net		$	(4	)		$	(5	)
	___________________________________________
	(a)The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three and six months ended December 27, 2013.

Fair_Value_Tables

Fair Value (Tables)	6 Months Ended
	Dec. 27, 2013
Fair Value Disclosures [Abstract]	'
Assets and liabilities that are measured at fair value on a recurring basis	'


		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	$	970			$	—			$	—			$	970

	Commercial paper	—				909				—				909

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

	Certificates of deposit	—				127				—				127

	Corporate bonds	—				5				—				5

	Other debt securities	—				—				—				—

	Equity securities	—				—				—				—

	Total cash equivalents and short-term investments	970				1,041				—				2,011

	Restricted cash and investments:
	Mutual Funds	—				—				—				—

	Certificates of deposit	—				4				—				4

	Auction rate securities	—				—				15				15

	Derivative assets	—				—				—				—

	Total assets	$	970			$	1,045			$	15			$	2,030

	Liabilities:
	Derivative liabilities	$	—			$	(2	)		$	—			$	(2	)

	Total return swap	—				—				—				—

	Total liabilities	$	—			$	(2	)		$	—			$	(2	)



		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	$	970			$	995			$	—			$	1,965

	Short-term investments	—				46				—				46

	Restricted cash and investments	—				4				—				4

	Other current assets	—				—				—				—

Other assets, net	—				—				15				15

Total assets	$	970			$	1,045			$	15			$	2,030

Liabilities:
Accrued expenses	$	—			$	(2	)		$	—			$	(2	)

Total liabilities	$	—			$	(2	)		$	—			$	(2	)

Assets and liabilities that are measured at fair value on a recurring basis, by balance sheet grouping	'


		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	)

Schedule of Company's debt at amortized cost and fair value	'


			December 27, 2013								June 28, 2013
	(Dollars in millions)		Carrying				Estimated				Carrying				Estimated
			Amount				Fair Value				Amount				Fair Value
	6.8% Senior Notes due October 2016		$	334			$	378			$	335			$	370

	3.75% Senior Notes due November 2018		800				811				—				—

	7.75% Senior Notes due December 2018		238				261				238				259

	6.875% Senior Notes due May 2020		600				649				600				644

	7.00% Senior Notes due November 2021		600				664				600				645

	4.75% Senior Notes due June 2023		1,000				937				1,000				938

	Other		—				—				4				4

			3,572				3,700				2,777				2,860

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

	Long-term debt, less current portion		$	3,572			$	3,700			$	2,774			$	2,857

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	6 Months Ended
	Dec. 27, 2013
Equity [Abstract]	'
Information with respect to repurchases of the Company's shares	'


	(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 six months ended December 27, 2013	37	$	1,702

Guarantees_Tables

Guarantees (Tables)	6 Months Ended
	Dec. 27, 2013
Guarantees [Abstract]	'
Product Warranty	'


		For the Three Months Ended						For the Six Months Ended
	(Dollars in millions)	December 27,			December 28,			December 27,			December 28,
		2013			2012			2013			2012
	Balance, beginning of period	$	318		$	337		$	320		$	363

	Warranties issued	48			50			96			98

	Repairs and replacements	(61		)	(67		)	(119		)	(151		)
	Changes in liability for pre-existing warranties, including expirations	(5		)	10			3			17

	Warranty liability assumed from business acquisitions	—			—			—			3

	Balance, end of period	$	300		$	330		$	300		$	330

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Dec. 27, 2013
Earnings Per Share [Abstract]	'
Schedule of computation of basic and diluted net income (loss) per share	'


		For the Three Months Ended				For the Six Months Ended
	(In millions, except per share data)	December 27,		December 28,		December 27,		December 28,
		2013		2012		2013		2012
	Numerator:

	Net income attributable to Seagate Technology plc	$	428	$	492	$	855	$	1,074

	Number of shares used in per share calculations:

	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	336		369		347		382

	Weighted-average effect of dilutive securities:

	Employee equity award plans	10		10		10		12

	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	346		379		357		394

	Net income per share attributable to Seagate Technology plc shareholders:

	Basic	$	1.27	$	1.33	$	2.46	$	2.81

	Diluted	$	1.24	$	1.3	$	2.39	$	2.73

Schedule of potential shares excluded from the computation of diluted net income (loss) per share	'
	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 six months ended December 27, 2013 and December 28, 2012.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 28, 2014	Dec. 27, 2013	Jun. 27, 2014	Jun. 28, 2013
Variable Interest Entity [Line Items]	'	'	'	'
Number Of Weeks In Fiscal Year Low End Of Range	'	'	'52	'P52W
Number Of Weeks In Fiscal Year High End Of Range	'	'	'53	'P53W
Number Of Weeks In Quarter	'P39W	'13	'	'P52W
Number of Weeks in Fiscal Year	'	'	'52	'

Balance_Sheet_Information_Deta

Balance Sheet Information (Details) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Investments	'	'
Cash and investments held as collateral at banks for various performance obligations	$4	$22
Investments - Available-for-sale and Trading securities	'	'
Restricted Cash and Investments Held in Trust	'	79
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis	2,015	'
Available-for-sale securities	'	'
Available-for-sale securities, Amortized Cost	2,032	2,048
Available-for-sale securities, Unrealized Gain/(Loss)	-2	-3
Available-for-sale securities, Fair Value	2,030	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	2,032	2,122
Investments, Unrealized gain/(loss)	-2	2
Investments, Fair Value	2,030	2,124
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value	2,015	'
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Pretax	0	'
Money market funds	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Amortized Cost	970	804
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	970	804
Commercial Paper [Member]	'	'
Available-for-sale securities	'	'
Available-for-sale securities, Amortized Cost	909	655
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	909	655
Corporate bonds	'	'
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
US 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	131	154
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	131	154
Auction rate securities	'	'
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	'	'
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
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Total available-for-sale and trading securities	'	'
Investments, Fair Value	2,030	2,124
Investments, included in Cash and cash equivalents	1,965	1,528
Investments, included in Short-term investments	46	480
Investments, included in Restricted cash and investments	4	101
Investments, included in Other assets, net	$15	$15

Balance_Sheet_Information_Deta1

Balance Sheet Information (Details 2) (USD $)	Dec. 27, 2013
In Millions, unless otherwise specified	Dec. 27, 2013
Available-for-sale debt securities, Amortized Cost	'
Amortized Cost	$2,032
stx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost	17
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis	2,015
AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortize	0
Available-for-sale debt securities, Fair Value	'
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value	2,015
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
Fair Value	$2,030

Balance_Sheet_Information_Deta2

Balance Sheet Information (Details 3) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Inventories	'	'
Raw materials and components	$254	$213
Work-in-process	255	231
Finished goods	439	410
Total inventories	948	854
Other Current Assets:	'	'
Vendor non-trade receivables	130	329
Other	137	155
Total other current assets	$267	$484

Balance_Sheet_Information_Deta3

Balance Sheet Information (Details 4) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Property, Equipment and Leasehold Improvements, net	'	'
Property, equipment and leasehold improvements, gross	$8,727	$8,544
Less accumulated depreciation and amortization	-6,599	-6,275
Property, Equipment and Leasehold Improvements, net	$2,128	$2,269

Balance_Sheet_Information_Deta4

Balance Sheet Information (Details 5) (USD $)	3 Months Ended				6 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013		Dec. 28, 2012		Dec. 27, 2013		Dec. 28, 2012
Unrealized Gains (Losses) on Cash Flow Hedges	'		'		'		'
Beginning Balance	'		'		$0		$0
Other comprehensive income before reclassifications	-2		0		-1		0
Amounts reclassified from AOCI	0		'		0		0
Other comprehensive income	-2		0		-1		0
Ending Balance	-1		0		-1		0
Unrealized Gains (Losses) on Marketable Securities	'		'		'		'
Beginning Balance	'		'		-3	[1]	-1	[1]
Other comprehensive income before reclassifications	0		-4		1	[1]	23	[1]
Amounts reclassified from AOCI	0	[1]	2		0		1	[1]
Other comprehensive income	0		-2		1	[1]	24	[1]
Ending Balance	-2	[1]	23	[1]	-2	[1]	23	[1]
Unrealized gains (losses) on post-retirements	'		'		'		'
Beginning Balance	'		'		-10		-8
Other comprehensive income before reclassifications	1		0		1		0
Amounts reclassified from AOCI	0		'		0		0
Other comprehensive income	1		0		1		0
Ending Balance	-9		-8		-9		-8
Foreign currency translation adjustments	'		'		'		'
Beginning Balance	'		'		0		0
Other comprehensive income before reclassifications	0		2		5		3
Amounts reclassified from AOCI	'		'		0		0
Other comprehensive income	'		'		5		3
Ending Balance	5		3		5		3
Total	'		'		'		'
Beginning Balance	'		'		-13		-9
Other comprehensive income before reclassifications	'		'		6		26
Amounts reclassified from AOCI	'		'		0		1
Other comprehensive income	-1		0		6		27
Ending Balance	($7)		$18		($7)		$18

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

Debt_Details

Debt (Details) (USD $)

6 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Dec. 27, 2013

Dec. 28, 2012

Apr. 30, 2013

Jan. 18, 2011

Dec. 27, 2013

Jun. 28, 2013

Aug. 03, 2012

Senior Notes 3.75 Percent due November 2018 [Member]

Secured Senior Second Priority Notes 10 Percent due May 2014 [Member]

6.8% Senior Notes due October 2016

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]

LaCie S.A. [Member]

Debt Disclosure [Abstract]

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

Debt Instrument [Line Items]

Stated interest rate (as a percent)

3.75%

6.80%

7.75%

6.88%

7.00%

Redemption price as percentage of principal amount (percent)

100.00%

Aggregate principal amount

800

600

750

600

Basis spread on variable rate (basis points)

0.50%

Loss on redemption of debt

-22

Long-term Debt

Long-term Debt, Current Maturities

Debt_Details_2

Debt (Details 2) (USD $)	Dec. 27, 2013	Apr. 30, 2013	Jan. 18, 2011
In Millions, unless otherwise specified	Dec. 27, 2013	Apr. 30, 2013	Jan. 18, 2011
Debt Instrument [Line Items]	'	'	'
Line of Credit Facility, Maximum Borrowing Capacity	'	$500	$350
Future principal payments on long-term debt	'	'	'
Long-Term Debt, Maturities, Repayments of Principal Remainder of Fiscal Year	0	'	'
2014	0	'	'
Long-Term Debt, Maturities, Repayments of Principal Second Full Fiscal Year	0	'	'
Long-Term Debt, Maturities, Repayments of Principal Third Full Fiscal Year	334	'	'
2017	0	'	'
Thereafter	3,238	'	'
Total future principal payments on long-term debt	3,572	'	'
Senior Notes 4.75 Percent Due June 2023 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Debt Instrument, Face Amount	$1,000	'	'
Debt Instrument, Interest Rate, Stated Percentage	4.75%	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]	'	'	'	'
Provision for income taxes	$14	$7	$27	$25
Discrete tax (benefits) charges	4	-6	6	1
Domestic federal statutory rate (as a percent)	25.00%	25.00%	25.00%	25.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	'	'	16	'
Unrecognized Tax Benefits	173	'	173	'
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	173	'	173	'
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	$30	'	$30	'

Acquisitions_Details

Acquisitions (Details)

3 Months Ended

6 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 27, 2013

Dec. 28, 2012

Dec. 27, 2013

Dec. 28, 2012

Mar. 29, 2013

Jun. 28, 2013

Dec. 30, 2011

Dec. 19, 2011

Sep. 28, 2012

Dec. 27, 2013

Aug. 03, 2012

Dec. 27, 2013

Jun. 28, 2013

Aug. 03, 2012

Dec. 27, 2013

Jun. 28, 2013

Aug. 03, 2012

Jun. 28, 2013

Dec. 27, 2013

USD ($)

Samsungs Hard Disk Drive Operations [Member]

LaCie S.A. [Member]

Customer Relationships [Member]

Existing Technology [Member]

IP R&D

Noncontrolling Interest

USD ($)

EUR (€)

USD ($)

LaCie S.A. [Member]

USD ($)

LaCie S.A. [Member]

USD ($)

Business Acquisition [Line Items]

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles

Business Acquisition Number Of Shares Acquired

23,382,904

Business Acquisition Costs Of Acquired Entity Cash Paid Per Share

€ 4.05

Business Acquisition, Contingent Consideration Per Share

€ 0.12

Business Acquistion Prepaid Compensation Cost Performance Period

'36

Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents

Business Acquisition, Purchase Price Allocation, Current Assets, Receivables

Net Income (Loss) Attributable to Parent

428

492

1,074

Acquired Finite-lived Intangible Asset, Amount

627

583

431

138

Acquired Finite-lived Intangible Asset, Weighted Average Useful Life

'5 years

Cash paid for consideration

107

Business Acquisition, Contingent Consideration, Potential Cash Payment

Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value

-72

Restriction period on trading of shares issued as consideration (in years)

1,000,000

Business Acquisition, Product Warranty Liability Assumed, Term

3,000,000

Business Acquisition Measurement Period

1,000,000

Noncontrolling Interest, Payment For Deposit To Acquire Noncontrolling Shares

-72

Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests

Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability

Business Acquisition, Percentage of Voting Interests Acquired

64.50%

Common Stock, Par or Stated Value Per Share

$0.00

Business Acquisition, Contingent Consideration Threshold (Percent)

95.00%

Business Acquisition, Contingent Consideration Condition Must Be Reached (Period)

Business Acquisition Prepaid Compensation Cost At Fair Vaule

Assets Acquired and Liabilities Assumed

Inventories

Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment

Business Acquisition, Purchase Price Allocation, Goodwill Amount

Business Acquisition, Purchase Price Allocation, Assets Acquired

262

Business Acquisition, Purchase Price Allocation, Current Liabilities, Other Liabilities

-6

Business Acquisition, Purchase Price Allocation, Liabilities Assumed

Total purchase price

111

Acquired Indefinite-lived Intangible Asset, Amount

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles

Net Income (Loss) Attributable to Noncontrolling Interest

Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net

111

Business Acquisition, Purchase Price Allocation, Current Assets, Marketable Securities

Business Acquisition, Purchase Price Allocation, Other Assets

Business Acquisition, Purchase Price Allocation, Current Liabilities, Accounts Payable And Other

($73)

Acquisitions_Details_2

Acquisitions (Details 2) (USD $)

Dec. 27, 2013

Jun. 28, 2013

Dec. 27, 2013

Aug. 03, 2012

Jun. 28, 2013

Dec. 27, 2013

Jun. 28, 2013

Aug. 03, 2012

Dec. 27, 2013

Jun. 28, 2013

Aug. 03, 2012

Dec. 27, 2013

Jun. 28, 2013

Aug. 03, 2012

In Millions, unless otherwise specified

LaCie S.A. [Member]

IP R&D

Existing Technology [Member]

Customer Relationships [Member]

Trade Names [Member]

LaCie S.A. [Member]

Intangible assets acquired

Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles

Acquired Finite-lived Intangible Asset, Amount

627

583

138

431

Acquired Indefinite-lived Intangible Asset, Amount

Total acquired identifiable intangible assets

Acquired Finite-lived Intangible Asset, Weighted Average Useful Life

'5 years

Business Acquisition, Purchase Price Allocation, Goodwill Amount

$13

Acquisitions_Details_3

Acquisitions (Details 3) (LaCie S.A. [Member])	Aug. 03, 2012
LaCie S.A. [Member]	'
Business Acquisition [Line Items]	'
Business Acquisition, Contingent Consideration Condition Must Be Reached (Period)	'6

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013
Changes in carrying amount of goodwill	'
Balance at the beginning of the period	$476
Goodwill acquired	1
Balance at the end of the period	$477

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Details 2) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012	Jun. 28, 2013
Intangible assets acquired	'	'	'	'	'
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$52	'	$52	'	'
Gross Carrying Amount	627	'	627	'	583
Accumulated Amortization	-298	'	-298	'	-222
Net Carrying Amount	329	'	329	'	'
Weighted Average Remaining Useful Life (in years)	'	'	'3 years 6 months 0 days	'	'3 years 10 months 24 days
Net Carrying Amount	329	'	329	'	361
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	0	'	0	'	'
Amortization of Intangible Assets	39	37	76	73	'
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	52	'	52	'	'
Finite-Lived Intangible Assets, Amortization Expense, Year Two	102	'	102	'	'
Finite-Lived Intangible Assets, Amortization Expense, Year Three	79	'	79	'	'
Finite-Lived Intangible Assets, Amortization Expense, Year Four	68	'	68	'	'
Finite-Lived Intangible Assets, Amortization Expense, Year Five	28	'	28	'	'
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	0	'	0	'	'
IP R&D	'	'	'	'	'
Intangible assets acquired	'	'	'	'	'
Gross Carrying Amount	'	'	'	'	44
IP R&D	'	'	'	'	'
Intangible assets acquired	'	'	'	'	'
Gross Carrying Amount	44	'	44	'	'
Accumulated Amortization	-5	'	-5	'	'
Weighted Average Remaining Useful Life (in years)	'	'	'1 year 6 months 0 days	'	'
Net Carrying Amount	39	'	39	'	'
Existing Technology [Member]	'	'	'	'	'
Intangible assets acquired	'	'	'	'	'
Gross Carrying Amount	138	'	138	'	138
Accumulated Amortization	-137	'	-137	'	-105
Weighted Average Remaining Useful Life (in years)	'	'	'3 years 7 months 24 days	'	'5 months 24 days
Net Carrying Amount	1	'	1	'	33
Customer Relationships [Member]	'	'	'	'	'
Intangible assets acquired	'	'	'	'	'
Gross Carrying Amount	431	'	431	'	431
Accumulated Amortization	-152	'	-152	'	-114
Weighted Average Remaining Useful Life (in years)	'	'	'3 years 9 months 24 days	'	'4 years 3 months 24 days
Net Carrying Amount	279	'	279	'	317
Trade Names [Member]	'	'	'	'	'
Intangible assets acquired	'	'	'	'	'
Gross Carrying Amount	14	'	14	'	14
Accumulated Amortization	-4	'	-4	'	-3
Weighted Average Remaining Useful Life (in years)	'	'	'3 years 7 months 24 days	'	'4 years 1 month 24 days
Net Carrying Amount	$10	'	$10	'	$11

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Total Return Swap [Member]	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	$87	'
Derivatives designated as hedging instruments \| Foreign currency forward exchange contracts	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	97	0
Derivatives designated as hedging instruments \| Foreign currency forward exchange contracts \| Thai baht	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives designated as hedging instruments \| Foreign currency forward exchange contracts \| Singapore dollars	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	97	0
Derivatives designated as hedging instruments \| Foreign currency forward exchange contracts \| Chinese Renminbi	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives designated as hedging instruments \| Foreign currency forward exchange contracts \| Czech koruna	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	'	0
Derivatives not designated as hedging instruments \| Foreign currency forward exchange contracts	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	39	20
Derivatives not designated as hedging instruments \| Foreign currency forward exchange contracts \| Thai baht	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	18	20
Derivatives not designated as hedging instruments \| Foreign currency forward exchange contracts \| Singapore dollars	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	21	0
Derivatives not designated as hedging instruments \| Foreign currency forward exchange contracts \| Chinese Renminbi	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	0	0
Derivatives not designated as hedging instruments \| Foreign currency forward exchange contracts \| Czech koruna	'	'
Derivative Financial Instruments	'	'
Notional value of outstanding foreign currency forward exchange contracts	'	$0

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 2) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	$0	$0
Liability derivatives, Accrued expenses	-2	-1
Derivatives designated as hedging instruments \| Foreign currency forward exchange contracts	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	0
Liability derivatives, Accrued expenses	-1	0
Derivatives not designated as hedging instruments \| Foreign currency forward exchange contracts	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	0
Liability derivatives, Accrued expenses	-1	-1
Derivatives not designated as hedging instruments \| Total Return Swap [Member]	'	'
Fair Values of Derivative Instruments	'	'
Asset Derivatives, Other current assets	0	'
Liability derivatives, Accrued expenses	$0	'

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Details 3) (Foreign currency forward exchange contracts, USD $)	3 Months Ended				6 Months Ended
	Dec. 27, 2013		Dec. 28, 2012		Dec. 27, 2013	Dec. 28, 2012
Derivatives Instruments, Gain (Loss)	'		'		'	'
Amount of Gain or (Loss) Recognized in Income on Derivative	'		$1,000,000		'	$3,000,000
Cash Flow Hedges	'		'		'	'
Derivatives Instruments, Gain (Loss)	'		'		'	'
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	-1,000,000		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 on Derivative	-4,000,000		'		-5,000,000	'
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
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$0	[1]	$0	[2]	$0	$0	[2]

[1]	The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three and six months ended DecemberB 27, 2013.
[2]	The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationship and $0 related to the amount excluded from the assessment of hedge effectiveness for the three and six months ended DecemberB 28, 2012, respectively.

Fair_Value_Details

Fair Value (Details) (Recurring basis, USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Quoted Prices in Active Markets for Identical Instruments (Level 1)	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	$970	$791
Restricted cash and investments	0	96
Other assets, net - Auction rate securities	0	0
Derivative assets	'	0
Total Assets	970	887
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Commercial Paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	'
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Money market funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	970	787
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| US Treasuries And Agency Bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| 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	'
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Corporate bonds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Other debt securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	'	22
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Equity Securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	4
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Mutual Funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	74
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Auction rate securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Other assets, net - Auction rate securities	0	0
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	'
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	0	'
Quoted Prices in Active Markets for Identical Instruments (Level 1) \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	0	'
Significant Other Observable Inputs (Level 2)	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	1,041	1,217
Restricted cash and investments	4	5
Other assets, net - Auction rate securities	0	0
Derivative assets	'	0
Total Assets	1,045	1,222
Accrued expenses - Derivative liabilities	-2	-1
Total Liabilities	-2	-1
Significant Other Observable Inputs (Level 2) \| Commercial Paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	909	655
Significant Other Observable Inputs (Level 2) \| Money market funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Significant Other Observable Inputs (Level 2) \| US Treasuries And Agency Bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	96
Significant Other Observable Inputs (Level 2) \| Certificates of Deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	127	149
Restricted cash and investments	4	'
Significant Other Observable Inputs (Level 2) \| Corporate bonds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	5	211
Significant Other Observable Inputs (Level 2) \| Other debt securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	106
Restricted cash and investments	'	5
Significant Other Observable Inputs (Level 2) \| Equity Securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Significant Other Observable Inputs (Level 2) \| Mutual Funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	0
Significant Other Observable Inputs (Level 2) \| Auction rate securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Other assets, net - Auction rate securities	0	0
Significant Other Observable Inputs (Level 2) \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	'
Significant Other Observable Inputs (Level 2) \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	-2	'
Significant Other Observable Inputs (Level 2) \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	0	'
Significant Unobservable Inputs (Level 3)	'	'
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
Other assets, net - Auction rate securities	15	15
Derivative assets	'	0
Total Assets	15	15
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Significant Unobservable Inputs (Level 3) \| Commercial Paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Significant Unobservable Inputs (Level 3) \| Money market funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Significant Unobservable Inputs (Level 3) \| US Treasuries And Agency Bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Significant Unobservable Inputs (Level 3) \| 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	'
Significant Unobservable Inputs (Level 3) \| Corporate bonds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Significant Unobservable Inputs (Level 3) \| Other debt securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Restricted cash and investments	'	0
Significant Unobservable Inputs (Level 3) \| Equity Securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	0
Significant Unobservable Inputs (Level 3) \| Mutual Funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	0
Significant Unobservable Inputs (Level 3) \| Auction rate securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Other assets, net - Auction rate securities	15	15
Significant Unobservable Inputs (Level 3) \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	'
Significant Unobservable Inputs (Level 3) \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	0	'
Significant Unobservable Inputs (Level 3) \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	0	'
Fair Value, Total Balance	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	2,011	2,008
Restricted cash and investments	4	101
Other assets, net - Auction rate securities	15	15
Derivative assets	'	0
Total Assets	2,030	2,124
Accrued expenses - Derivative liabilities	-2	-1
Total Liabilities	-2	-1
Fair Value, Total Balance \| Commercial Paper [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	909	655
Fair Value, Total Balance \| Money market funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	970	787
Fair Value, Total Balance \| US Treasuries And Agency Bonds [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	96
Fair Value, Total Balance \| Certificates of Deposit [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	127	149
Restricted cash and investments	4	'
Fair Value, Total Balance \| Corporate bonds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	5	211
Fair Value, Total Balance \| Other debt securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	106
Restricted cash and investments	'	27
Fair Value, Total Balance \| Equity Securities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash equivalents and short-term investments	0	4
Fair Value, Total Balance \| Mutual Funds	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Restricted cash and investments	0	74
Fair Value, Total Balance \| Auction rate securities	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Other assets, net - Auction rate securities	15	15
Fair Value, Total Balance \| Derivative Financial Instruments, Assets [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Derivative assets	0	'
Fair Value, Total Balance \| Derivative Financial Instruments, Liabilities [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	-2	'
Fair Value, Total Balance \| Total Return Swap [Member]	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Accrued expenses - Derivative liabilities	$0	'

Fair_Value_Details_2

Fair Value (Details 2) (Recurring basis, USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Quoted Prices in Active Markets for Identical Instruments (Level 1)	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	$970	$787
Short-term investments	0	4
Restricted cash and investments	0	96
Other current assets	0	0
Other assets, net - Auction rate securities	0	0
Total Assets	970	887
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2)	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	995	741
Short-term investments	46	476
Restricted cash and investments	4	5
Other current assets	0	0
Other assets, net - Auction rate securities	0	0
Total Assets	1,045	1,222
Accrued expenses - Derivative liabilities	-2	-1
Total Liabilities	-2	-1
Significant Unobservable Inputs (Level 3)	'	'
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
Other assets, net - Auction rate securities	15	15
Total Assets	15	15
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Fair Value, Total Balance	'	'
Assets and liabilities measured at fair value on a recurring basis	'	'
Cash and cash equivalents	1,965	1,528
Short-term investments	46	480
Restricted cash and investments	4	101
Other current assets	0	0
Other assets, net - Auction rate securities	15	15
Total Assets	2,030	2,124
Accrued expenses - Derivative liabilities	-2	-1
Total Liabilities	($2)	($1)

Fair_Value_Details_3

Fair Value (Details 3) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation	'	'
Cost Method Investments	$44	$66
Significant Unobservable Inputs (Level 3) \| Auction rate securities	'	'
Auction rate securities	'	'
Par value of securities	17	'
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation	'	'
Balance, beginning of period	15	15
Balance, end of period	$15	$15

Fair_Value_Details_4

Fair Value (Details 4) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Fair value on a nonrecurring basis	'	'
Cost Method Investments	$44	$66

Fair_Value_Details_5

Fair Value (Details 5) (USD $)	Dec. 27, 2013	Jun. 28, 2013
In Millions, unless otherwise specified	Dec. 27, 2013	Jun. 28, 2013
Debt Fair Value Disclosures	'	'
Long-term Debt and Capital Lease Obligations, Current	$0	($3)
Long-term Debt and Capital Lease Obligations	3,572	2,774
6.8% Senior Notes due October 2016	'	'
Debt Fair Value Disclosures	'	'
Stated interest rate (as a percent)	6.80%	'
Senior Notes 3.75 Percent due November 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Stated interest rate (as a percent)	3.75%	'
Senior Notes 7.75 Percent Due December 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Stated interest rate (as a percent)	7.75%	'
Senior Notes 6.875 Percent due May 2020 [Member]	'	'
Debt Fair Value Disclosures	'	'
Stated interest rate (as a percent)	6.88%	'
Senior Notes 7.00 Percent Due November 2021 [Member]	'	'
Debt Fair Value Disclosures	'	'
Stated interest rate (as a percent)	7.00%	'
Senior Notes 4.75 Percent Due June 2023 [Member]	'	'
Debt Fair Value Disclosures	'	'
Stated interest rate (as a percent)	4.75%	'
Carrying Amount	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	3,572	2,777
Long-term Debt and Capital Lease Obligations, Current	0	-3
Long-term Debt and Capital Lease Obligations	3,572	2,774
Carrying Amount \| 6.8% Senior Notes due October 2016	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	334	335
Carrying Amount \| 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 \| 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 \| Senior Notes 6.875 Percent due May 2020 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	600	600
Carrying Amount \| Senior Notes 7.00 Percent Due November 2021 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	600	600
Carrying Amount \| 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 \| Other Debt [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	0	4
Fair Value, Total Balance	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	3,700	2,860
Long-term Debt and Capital Lease Obligations, Current	0	-3
Long-term Debt and Capital Lease Obligations	3,700	2,857
Fair Value, Total Balance \| 6.8% Senior Notes due October 2016	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	378	370
Fair Value, Total Balance \| Senior Notes 3.75 Percent due November 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	811	0
Fair Value, Total Balance \| Senior Notes 7.75 Percent Due December 2018 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	261	259
Fair Value, Total Balance \| Senior Notes 6.875 Percent due May 2020 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	649	644
Fair Value, Total Balance \| Senior Notes 7.00 Percent Due November 2021 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	664	645
Fair Value, Total Balance \| Senior Notes 4.75 Percent Due June 2023 [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	937	938
Fair Value, Total Balance \| Other Debt [Member]	'	'
Debt Fair Value Disclosures	'	'
Current and noncurrent debt including short-term borrowings	$0	$4

Shareholders_Equity_Details

Shareholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended	1 Months Ended
	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012	Jul. 31, 2013	Apr. 30, 2012
	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012	stx_April 2012ShareRepurchaseProgram [Member]	stx_April 2012ShareRepurchaseProgram [Member]
Equity [Abstract]	'	'	'	'	'	'
Authorized share capital (in dollars)	$13,500	'	$13,500	'	'	'
Ordinary shares, authorized	1,250,000,000	'	1,250,000,000	'	'	'
Ordinary shares, par value (in dollars per share)	$0.00	'	$0.00	'	'	'
Ordinary shares, outstanding	328,474,485	'	328,474,485	'	'	'
Preferred shares, authorized	100,000,000	'	100,000,000	'	'	'
Preferred shares, par value (in dollars per share)	$0.00	'	$0.00	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'
Cash dividends declared per share (in dollars per share)	$0.43	$0.70	$0.81	$1.02	'	'
Dividends, Common Stock, Cash	'	'	277,000,000	'	'	'
Stock Repurchase Program, Authorized Amount	'	'	'	'	2,500,000,000	2,500,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	'	'	$1,700,000,000	'	'	'

Shareholders_Equity_Details_2

Shareholders' Equity (Details 2) (USD $)	3 Months Ended		6 Months Ended	0 Months Ended	1 Months Ended
Share data in Millions, unless otherwise specified	Dec. 27, 2013	Sep. 27, 2013	Dec. 27, 2013	Jul. 31, 2013	Apr. 30, 2012
	Dec. 27, 2013	Sep. 27, 2013	Dec. 27, 2013	stx_April 2012ShareRepurchaseProgram [Member]	stx_April 2012ShareRepurchaseProgram [Member]
Repurchases of equity securities	'	'	'	'	'
Preferred Stock Minimum Number of Series	1	'	1	'	'
Stock repurchase program, additional authorization	'	'	'	$2,500,000,000	$2,500,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	'	'	1,700,000,000	'	'
Repurchases of Equity Securities, Number of Shares Repurchased	'	'	'	'	'
Number of Shares Repurchased, During the Period	33	4	37	'	'
Value of Stock Repurchased and Retired During Period	$1,520,000,000	$182,000,000	$1,702,000,000	'	'

Compensation_Details

Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Share-based Compensation	$30	$19	$57	$36

Guarantees_Details

Guarantees (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 27, 2013	Dec. 28, 2012
	Dec. 27, 2013	Dec. 28, 2012	Y	Y	Dec. 28, 2012
Guarantees [Abstract]	'	'	'	'	'
Product Warranty Period Term, Maximum	'	'	5	5	'
Range of product warranty term, low end (in years)	'	'	1	1	'
Movement in product warranty	'	'	'	'	'
Balance, beginning of period	$318	$337	$320	$320	$363
Warranties issued	48	50	'	96	98
Repairs and replacements	-61	-67	'	-119	-151
Changes in liability for pre-existing warranties, including expirations	-5	10	'	3	17
Warranty liability assumed from Samsung HDD business	0	0	'	0	3
Balance, end of period	$300	$330	$300	$300	$330

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012
Numerator:	'	'	'	'
Net income (in dollars)	$428	$492	'	$1,074
Number of shares used in per share calculations:	'	'	'	'
Total shares for purpose of calculating basic net income (loss) per share	336	369	347	382
Weighted-average effect of dilutive securities:	'	'	'	'
Employee equity award plans (in shares)	10	10	10	12
Total shares for purpose of calculating diluted net income (loss) per share	346	379	357	394
Net income per share:	'	'	'	'
Basic net income per share (in dollars per share)	$1.27	$1.33	$2.46	$2.81
Diluted net income per share (in dollars per share)	$1.24	$1.30	$2.39	$2.73

Legal_Environmental_and_Other_1

Legal, Environmental and Other Contingencies (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 27, 2013
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