Seagate Technology (STX) 10-Q 30 Apr 15 2015 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Apr. 03, 2015	Apr. 30, 2015
Document And Entity Information
Entity Registrant Name	Seagate Technology plc
Entity Central Index Key	1137789
Document Type	10-Q
Document Period End Date	3-Apr-15
Amendment Flag	FALSE
Current Fiscal Year End Date	4
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		317,381,531,000,000
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$2,604	$2,634
Short-term investments	6	20
Restricted cash and investments	4	4
Accounts receivable, net	1,769	1,729
Inventories	1,083	985
Deferred income taxes	121	126
Other current assets	244	279
Total current assets	5,831	5,777
Property, equipment and leasehold improvements, net	2,182	2,136
Goodwill	871	537
Other intangible assets, net	410	359
Deferred income taxes	499	499
Other assets, net	243	184
Total Assets	10,036	9,492
Current liabilities:
Accounts payable	1,683	1,549
Accrued employee compensation	256	296
Accrued warranty	147	148
Accrued expenses	483	405
Current portion of long-term debt	474	0
Total current liabilities	3,043	2,398
Long-term accrued warranty	126	125
Long-term accrued income taxes	34	90
Other non-current liabilities	185	127
Long-term debt	3,457	3,920
Total Liabilities	6,845	6,660
Seagate Technology plc Shareholders' Equity:
Ordinary shares and additional paid-in capital	5,696	5,511
Accumulated other comprehensive loss	-33	-2
Accumulated deficit	-2,472	-2,677
Total Seagate Technology plc Shareholders' Equity	3,191	2,832
Noncontrolling interest	0	0
Total Equity	3,191	2,832
Total Liabilities and Equity	$10,036	$9,492

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Income Statement [Abstract]
Revenue	$3,330	$3,406	$10,811	$10,423
Cost of revenue	2,375	2,447	7,778	7,502
Product development	346	297	1,029	903
Marketing and administrative	219	190	654	561
Amortization of intangibles	33	26	95	71
Restructuring and other, net	14	2	24	20
Gain on arbitration award, net	0	0	-620	0
Total operating expenses	2,987	2,962	8,960	9,057
Income from operations	343	444	1,851	1,366
Interest income	1	1	4	7
Interest expense	-48	-52	-152	-145
Other, net	8	-3	118	44
Other income (expense), net	-39	-54	-30	-94
Income before income taxes	304	390	1,821	1,272
Provision for (benefit from) income taxes	-13	5	-216	-22
Net income	291	395	1,605	1,250
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Seagate Technology plc	$291	$395	$1,605	$1,250
Net income per share attributable to Seagate Technology plc ordinary shareholders:
Basic (in dollars per share)	$0.90	$1.21	$4.92	$3.68
Diluted (in dollars per share)	$0.88	$1.17	$4.81	$3.56
Number of shares used in per share calculations:
Basic (in shares)	323	327	326	340
Diluted (in shares)	330	338	334	351
Cash dividends declared per Seagate Technology plc ordinary share	$0.54	$0.43	$1.51	$1.24

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Statement of Comprehensive Income [Abstract]
Net income	$291	$395	$1,605	$1,250
Cash flow hedges
Change in net unrealized gain (loss) on cash flow hedges	-3	1	-12	0
Less: reclassification for amounts included in net income	7	0	9	0
Net change	4	1	-3	0
Marketable securities
Change in net unrealized gain (loss) on marketable securities	0	0	0	1
Less: reclassification for amounts included in net income	0	0	0	0
Net change	0	0	0	1
Post-retirement plans
Change in unrealized gain (loss) on post-retirement plans	0	0	0	1
Less: reclassification for amounts included in net income	0	0	0	0
Net change	0	0	0	1
Foreign currency translation adjustments
Foreign currency translation adjustments	-12	4	-28	9
Total other comprehensive income (loss), net of tax	-8	5	-31	11
Comprehensive income	283	400	1,574	1,261
Less: Comprehensive income attributable to noncontrolling interest	0	0	0	0
Comprehensive income attributable to Seagate Technology plc	$283	$400	$1,574	$1,261

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014
OPERATING ACTIVITIES
Net income	$1,605	$1,250
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	629	668
Share-based compensation	106	87
Deferred income taxes	-3	-17
Gain on sale of investments	1	-6
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	0	32
Loss on redemption and repurchase of debt	52	7
Other non-cash operating activities, net	-9	16
Changes in operating assets and liabilities:
Restricted cash and investments	0	-104
Accounts receivable, net	-36	32
Inventories	-61	8
Accounts payable	149	-274
Accrued employee compensation	-40	-123
Accrued expenses, income taxes and warranty	-9	16
Vendor non-trade receivables	30	204
Other assets and liabilities	5	41
Net cash provided by operating activities	2,419	1,981
INVESTING ACTIVITIES
Acquisition of property, equipment and leasehold improvements	-546	-428
Proceeds from the sale of strategic investments	0	72
Purchases of short-term investments	-5	-87
Sales of short-term investments	4	463
Maturities of short-term investments	19	61
Cash used in acquisition of business	450	0
Other investing activities, net	90	29
Net cash (used in) provided by investing activities	-1,068	52
FINANCING ACTIVITIES
Redemption and repurchase of debt	-536	-64
Net proceeds from issuance of long-term debt	498	791
Repurchases of ordinary shares	-907	-1,886
Dividends to shareholders	-493	-417
Proceeds from issuance of ordinary shares under employee stock plans	91	98
Other financing activities, net	-12	-5
Net cash used in financing activities	-1,359	-1,483
Effect of foreign currency exchange rate changes on cash and cash equivalents	-22	1
Increase (decrease) in cash and cash equivalents	-30	551
Cash and cash equivalents at the beginning of the period	2,634	1,708
Cash and cash equivalents at the end of the period	$2,604	$2,259

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)	Total	Ordinary Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Parent [Member]	Noncontrolling Interest [Member]
In Millions, unless otherwise specified
Total Seagate Technology plc Shareholders' Equity, Starting Balance at Jun. 27, 2014	$2,832	$0	$5,511	($2)	($2,677)	$2,832
Noncontrolling Interest Equity, Starting Balance at Jun. 27, 2014	0						0
Total Equity, Beginning balance at Jun. 27, 2014	2,832
Starting Balance (in shares) at Jun. 27, 2014		327
Increase (Decrease) in Stockholders' Equity
Net income	1,605				1,605	1,605	0
Other comprehensive income (loss)	-31			-31		-31
Issuance of ordinary shares under employee stock plans	91		91			91
Issuance of ordinary shares under employee stock plans (in shares)		6
Repurchases of ordinary shares	-907				-907	-907
Repurchases of ordinary shares (in shares)	-15	-15
Dividends to shareholders	-493				-493	-493
Share-based compensation	106		106			106
Others	-12		-12
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests						12
Total Seagate Technology plc Shareholders' Equity, Ending Balance at Apr. 03, 2015	3,191	0	5,696	-33	-2,472	3,191
Noncontrolling Interest Equity, Ending Balance at Apr. 03, 2015	0						0
Total Equity, Ending balance at Apr. 03, 2015	$3,191
Ending Balance (in shares) at Apr. 03, 2015		318

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Apr. 03, 2015
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 electronic data storage solutions. 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. In addition to HDDs, we produce a broad range of electronic data storage products including solid state hybrid drives (“SSHD”) and solid state drives (“SSD”).
	The Company's products are designed for enterprise servers and storage systems in mission critical and nearline applications; client compute applications, where its products are designed primarily for desktop and mobile computing; 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.
	The Company continues to make strategic investments in order to expand its storage solutions, enter new market adjacencies, and expand its technical expertise. As a result of recent acquisitions, the Company's product and solution portfolio for the enterprise data storage industry includes storage enclosures, integrated application platforms and high performance computing ("HPC") data storage solutions. The Company's storage subsystems supports a range of high-speed interconnect technologies to meet demanding cost and performance specifications. The Company's modular subsystem architecture allows it to support many segments within the networked storage market by enabling different specifications of storage subsystem designs to be created from a standard set of interlocking technology modules.
	In addition to manufacturing and selling data storage products, the Company provides data storage services for small to medium-sized businesses, including online backup, data protection and recovery solutions.
	Basis of Presentation and Consolidation
	The unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned and majority-owned subsidiaries, after elimination of intercompany transactions and balances.
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles 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 27, 2014, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 7, 2014. 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 27, 2014, and the notes thereto, are adequate to make the information presented not misleading.
	The results of operations for the three and nine months ended April 3, 2015, are not necessarily indicative of the results of operations to be expected for any subsequent interim period in the Company’s fiscal year ending July 3, 2015. The Company operates and reports financial results on a fiscal year of 52 or 53 weeks ending on the Friday closest to June 30. The three and nine months ended April 3, 2015 consisted of 13 weeks and 40 weeks, respectively. The three and nine months ended March 28, 2014 consisted of 13 weeks and 39 weeks, respectively.  Fiscal year 2015 will be comprised of 53 weeks and will end on July 3, 2015. The fiscal quarters ended April 3, 2015, January 2, 2015, and March 28, 2014, are also referred to herein as the “March 2015 quarter”, the “December 2014 quarter”, and the “March 2014 quarter”, respectively.
	Summary of Significant Accounting Policies
	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 27, 2014, as filed with the SEC on August 7, 2014 for a discussion of the Company’s other significant accounting policies.
	Recently Issued Accounting Pronouncements
	In May 2014, the FASB issued ASU 2014-09 (ASC Topic 606), Revenue from Contracts with Customers. The ASU outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. It also requires entities to disclose both quantitative and qualitative information that enable financial statements users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The ASU, as currently proposed, will be effective for the Company's first quarter of fiscal year 2019. The Company is in the process of assessing the impact, if any, of ASU 2014-09 on its consolidated financial statements.
	In April 2015, the FASB issued ASU 2015-03 (ASC Subtopic 835-30), Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this new guidance will not have a material impact on the Company’s consolidated financial statements and disclosures.
	8

Balance_Sheet_Information

Balance Sheet Information	9 Months Ended
	Apr. 03, 2015
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 April 3, 2015:
	(Dollars in millions)	Amortized			Unrealized			Fair
		Cost			Gain/(Loss)			Value
	Available-for-sale securities:
	Money market funds	$	705		$	—		$	705
	Corporate bonds	6			—			6
	Certificates of deposit	1,485			—			1,485
		$	2,196		$	—		$	2,196
	Included in Cash and cash equivalents							$	2,186
	Included in Short-term investments							6
	Included in Restricted cash and investments							4
	Total							$	2,196
	As of April 3, 2015, 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 April 3, 2015, 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 that no available-for-sale securities were other-than-temporarily impaired as of April 3, 2015.
	The fair value and amortized cost of the Company’s investments classified as available-for-sale at April 3, 2015, by remaining contractual maturity were as follows:
	(Dollars in millions)	Amortized			Fair
		Cost			Value
	Due in less than 1 year	$	2,190		$	2,190
	Due in 1 to 5 years	6			6
	Thereafter	—			—
	Total	$	2,196		$	2,196
	The following table summarizes, by major type, the fair value and amortized cost of the Company’s investments as of June 27, 2014:
	(Dollars in millions)	Amortized			Unrealized			Fair
		Cost			Gain/(Loss)			Value
	Available-for-sale securities:
	Money market funds	$	793		$	—		$	793
	Commercial paper	1,261			—			1,261
	Corporate bonds	6			—			6
	Certificates of deposit	273			—			273
	Total	$	2,333		$	—		$	2,333
	Included in Cash and cash equivalents							$	2,309
	Included in Short-term investments							20
	Included in Restricted cash and investments							4
	Total							$	2,333
	As of June 27, 2014, 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 June 27, 2014.
	Inventories
	The following table provides details of the inventory balance sheet item:
	(Dollars in millions)	April 3,			June 27,
		2015			2014
	Raw materials and components	$	366		$	324
	Work-in-process	288			267
	Finished goods	429			394
		$	1,083		$	985
	Property, Equipment and Leasehold Improvements, net
	The components of property, equipment and leasehold improvements, net, were as follows:
	(Dollars in millions)	April 3,			June 27,
		2015			2014
	Property, equipment and leasehold improvements	$	9,403		$	8,979
	Accumulated depreciation and amortization	(7,221		)	(6,843		)
		$	2,182		$	2,136
	Accumulated Other Comprehensive Income (Loss) (“AOCI”)
	The components of AOCI, net of tax, were as follows:
	(Dollars in millions)	Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Marketable Securities (a)			Unrealized Gains (Losses) on post-retirements			Foreign currency translation adjustments			Total
	Balance at June 27, 2014	$	(1	)	$	—		$	(10	)	$	9		$	(2	)
	Other comprehensive income (loss) before reclassifications	(12		)	—			—			(28		)	(40		)
	Amounts reclassified from AOCI	9			—			—			—			9
	Other comprehensive income (loss)	(3		)	—			—			(28		)	(31		)
	Balance at April 3, 2015	$	(4	)	$	—		$	(10	)	$	(19	)	$	(33	)
	Balance at June 28, 2013	$	—		$	(3	)	$	(10	)	$	—		$	(13	)
	Other comprehensive income (loss) before reclassifications	—			1			1			9			11
	Amounts reclassified from AOCI	—			—			—			—			—
	Other comprehensive income (loss)	—			1			1			9			11
Balance at March 28, 2014	$	—		$	(2	)	$	(9	)	$	9		$	(2	)
___________________________________________
(a)The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt

Debt	9 Months Ended
	Apr. 03, 2015
Debt Disclosure [Abstract]
Debt	Debt
	Short-Term Borrowings
	On January 15, 2015, the Company and its subsidiary, Seagate HDD Cayman, entered into the Third Amendment to the 2011 Credit Agreement which increased the commitments available under the senior secured revolving credit facility (the "Revolving Credit Facility") from $500 million to $700 million and also extended the maturity date on the Credit Agreement until January 15, 2020, provided that if the Company does not have Investment Grade Ratings (as defined in the Credit Agreement) on August 15, 2018, then the maturity date will be August 16, 2018 unless certain extension conditions have been satisfied. The loans made under the Credit Agreement will bear interest at a rate of LIBOR plus a variable margin that will be determined based on the corporate credit rating of the Company. The Company and certain of its material subsidiaries fully and unconditionally guarantee the Revolving Credit Facility. The Revolving Credit Facility is available for cash borrowings and for the issuance of letters of credit up to a sub-limit of $75 million. As of April 3, 2015, no borrowings had been drawn or letters of credit utilized under the Revolving Credit Facility.
	Long-Term Debt
	$600 million Aggregate Principal Amount of 6.8% Senior Notes due October 2016 (the “2016 Notes”). The interest on the 2016 Notes was payable semi-annually on April 1 and October 1 of each year. The issuer under the 2016 Notes was Seagate HDD Cayman, and the obligations under the 2016 Notes were unconditionally guaranteed by certain of the Company’s significant subsidiaries. During the December 2014 quarter, the 2016 Notes were fully extinguished through repurchase and redemption for cash at a premium to their principal amount, plus accrued and unpaid interest.
	$800 million Aggregate Principal Amount of 3.75% Senior Notes due November 2018 (the “2018 Notes”). The interest on the 2018 Notes is payable semi-annually on May 15 and November 15 of each year. The issuer under the 2018 Notes is Seagate HDD Cayman, and the obligations under the 2018 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	$600 million Aggregate Principal Amount of 6.875% Senior Notes due May 2020 (the “2020 Notes”). The interest on the 2020 Notes is payable semi-annually on May 1 and November 1 of each year. The issuer under the 2020 Notes is Seagate HDD Cayman, and the obligations under the 2020 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company. During the March 2015 quarter, the Company repurchased $1 million aggregate principal amount of its 2020 Notes for cash at a premium to their principal amount, plus accrued and unpaid interest. On April 7, 2015, Seagate HDD Cayman announced that it will redeem all of its remaining outstanding 2020 Notes. The Notes will be redeemed on May 7, 2015 (the “Redemption Date”) at a redemption price equal to $1,034.38 per $1,000 principal amount of the 2020 Notes redeemed plus accrued and unpaid interest from the interest payment date of May 1, 2015 to the Redemption Date. As a result, the 2020 Notes are classified as Current portion of long-term debt on the Company's Condensed Consolidated Balance Sheet at April 3, 2015.
	$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 the Company.
	$1 billion Aggregate Principal Amount of 4.75% Senior Notes due June 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.
	$1 billion Aggregate Principal Amount of 4.75% Senior Notes due January 2025 (the “2025 Notes”). The interest on the 2025 Notes is payable semi-annually on January 1 and July 1 of each year, which commenced on January 1, 2015. The issuer under the 2025 Notes is Seagate HDD Cayman, and the obligations under the 2025 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	$500 million Aggregate Principal Amount of 5.75% Senior Notes due December 1, 2034 (the “2034 Notes”). On December 2, 2014, Seagate HDD Cayman issued, in a private placement, $500 million in aggregate principal amount of 5.75% Senior Notes due 2034 which mature on December 1, 2034. The interest on the Notes is payable semi-annually on June 1 and December 1 of each year, commencing on June 1, 2015. At any time before June 1, 2034, Seagate HDD Cayman may redeem some or all of the Notes at a “make-whole” redemption price. The ‘‘make-whole’’ redemption price will be equal to (1) 100% of the principal amount of the Notes redeemed, plus (2) the excess, if any of (x) the sum of the present values of the remaining scheduled payments of principal and interest on the Notes being redeemed, discounted to the redemption date on a semi-annual basis at a rate equal to the sum of the Treasury Rate plus 50 basis points, minus accrued and unpaid interest, if any, on the Notes being redeemed to, but excluding, the redemption date over (y) the principal amount of the Notes being redeemed, plus (3) accrued and unpaid interest, if any, on the Notes being redeemed to, but excluding, the redemption date. At any time on or after June 1, 2034, the Company may redeem some or all of the Notes at a redemption price equal to 100% of the principal amount of the Notes redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. The issuer under the 2034 Notes is Seagate HDD Cayman, and the obligations under the 2034 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company.
	At April 3, 2015, future principal payments on long-term debt were as follows (in millions):
	Fiscal Year	Amount
	Remainder of 2015	$	474
	2016	—
	2017	—
	2018	—
	2019	800
	Thereafter	2,659
		$	3,933

Income_Taxes

Income Taxes	9 Months Ended
	Apr. 03, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The Company recorded an income tax provision of $13 million and $216 million in the three and nine months ended April 3, 2015, respectively. The income tax provision for the nine months ended April 3, 2015, included approximately $181 million of net tax expense due to the final audit assessment received from the Jiangsu Province State Tax Bureau of the People's Republic of China (China assessment) for calendar years 2007 through 2013.
	The Company's income tax provision recorded for the three and nine months ended April 3, 2015 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, (ii) tax expense associated with the China assessment recorded in the three months ending January 2, 2015, and (iii) a decrease in valuation allowance for certain U.S. deferred tax assets.
	During the nine months ended April 3, 2015, the Company’s unrecognized tax benefits excluding interest and penalties decreased by $39 million primarily due to (i) reductions associated with audit settlements of $45 million, (ii) increases in current year unrecognized tax benefits of $8 million, (iii) reductions associated with the expiration of certain statutes of limitations of $4 million, and (iv) net increases associated with changes in prior years' positions of $2 million.
	The unrecognized tax benefits that, if recognized, would impact the effective tax rate were $76 million at April 3, 2015, subject to certain future valuation allowance reversals. During the 12 months beginning April 4, 2015, the Company expects that its unrecognized tax benefits could be reduced by approximately $3 million as a result of the expiration of certain statutes of limitation.
	The Company is subject to taxation in many jurisdictions globally and is required to file U.S. federal, U.S. state and non-U.S. income tax returns. In June 2014, the Company received the Revenue Agent’s Report and Notices of Proposed Adjustments for its U.S. federal income tax returns for fiscal years 2008, 2009 and 2010. The Company is currently contesting certain of these proposed adjustments through the IRS Appeals Office. The Company believes that the resolution of these disputed issues will not have a material impact on its financial statements. As discussed above, on December 31, 2014, the Company received the final audit assessment from the Jiangsu Province State Tax Bureau of the People’s Republic of China. The assessment was related to tax and interest associated with changes to the Company’s tax filings for calendar years 2007 through 2013.
	The Company recorded an income tax benefit and an income tax provision of $5 million and $22 million in the three and nine months ended March 28, 2014, respectively. The income tax benefit for the three months ended March 28, 2014 included $14 million of net discrete tax benefits related to releases of tax reserves due to audit settlements. The income tax provision recorded for the nine months ended March 28, 2014 included $7 million of net discrete tax benefits for the reversal of a portion of the U.S. valuation allowance recorded in prior periods and a net decrease in tax reserves related to audit settlements offset by tax reserves on non-U.S. tax positions taken in prior fiscal years.
	The Company’s income tax provision recorded for the three and nine months ended March 28, 2014 differed from the provision for income taxes that would be derived by applying the Irish statutory rate of 25% to income before income taxes, primarily due to the net effect of (i) tax benefits related to non-U.S. earnings generated in jurisdictions that are subject to tax holidays or tax incentive programs and are considered indefinitely reinvested outside of Ireland and (ii) a decrease in valuation allowance for certain U.S. deferred tax assets.

Acquisitions

Acquisitions	9 Months Ended
	Apr. 03, 2015
Business Combinations [Abstract]
Business Combination Disclosure	Acquisitions
	LSI's Flash Business
	On September 2, 2014, the Company completed the acquisition of certain assets and liabilities of LSI Corporation's ("LSI") Accelerated Solutions Division and Flash Components Division (collectively, the "Flash Business") from Avago Technologies Limited for $450 million in cash. The transaction is expected to strengthen Seagate's strategy to deliver a full suite of storage solutions, providing Seagate with established enterprise PCIe flash and SSD controller capabilities to deliver solutions for the growing flash storage market.
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Inventories	$	37
	Property, plant and equipment	22
	Intangible assets	141
	Other assets	6
	Goodwill	337
	Total assets	543
	Liabilities	(93		)
	Total liabilities	(93		)
	Total	$	450
	The following table shows the fair value of the separately identifiable intangible assets at the time of acquisition and the weighted-average period over which intangible assets within each category will be amortized:
	(Dollars in millions)	Fair Value			Weighted-
					Average
					Amortization
					Period
	Existing technology	$	84		3.5 years
	Customer relationships	40			3.8 years
	Trade names	17			4.5 years
	Total acquired identifiable intangible assets	$	141
	The goodwill recognized is primarily attributable to the benefits the Company expects to derive from enhanced market opportunities, and is not deductible for income tax purposes.
	The Company incurred approximately $1 million of expenses related to the acquisition of LSI's Flash Business during the nine months ended April 3, 2015, which are included within Marketing and administrative expense on the Consolidated Statement of Operations.
	The amounts of revenue and earnings of LSI's Flash Business included in the Company's Consolidated Statement of Operations from the acquisition date are not significant.
	Xyratex Ltd
	On March 31, 2014, the Company acquired all of the outstanding shares of Xyratex Ltd (“Xyratex”), a leading provider of data storage technology. The Company paid $13.25 per share, or approximately $376 million in cash for the acquisition. The acquisition of Xyratex further strengthens the Company’s vertically integrated supply and manufacturing chain for disk drives and provides access to important capital requirements, as well as expands the Company’s storage solutions portfolio.
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Cash and cash equivalents	$	91
	Accounts receivable, net	67
	Inventories	111
	Other current and non-current assets	28
	Property, plant and equipment	55
	Intangible assets	80
	Goodwill	60
	Total assets	492
	Accounts payable and accrued expenses	(116		)
	Total liabilities	(116		)
	Total	$	376
	The accounts receivable of $67 million are net of an immaterial allowance at March 31, 2014.
	The following table shows the fair value of the separately identifiable intangible assets at the time of acquisition and the weighted-average period over which intangible assets within each category will be amortized:
	(Dollars in millions)	Fair Value			Weighted-
					Average
					Amortization
					Period
	Existing technology	$	23		5.5 years
	Customer relationships	18			3.9 years
	Total amortizable intangible assets acquired	41			4.8 years
	In-process research and development	39
	Total acquired identifiable intangible assets	$	80
	The goodwill recognized is primarily attributable to the synergies expected to arise from the acquisition, and is not deductible for income tax purposes.
	The Company incurred a total of $10 million of expenses related to the acquisition of Xyratex in fiscal year 2014, which are included within Marketing and administrative expense on the Consolidated Statement of Operations.
	The amounts of revenue and earnings of Xyratex included in the Company's Consolidated Statement of Operations from the acquisition date are not significant.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	9 Months Ended
	Apr. 03, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets
	6	Goodwill and Other Intangible Assets
	Goodwill
	The changes in the carrying amount of goodwill for the nine months ended April 3, 2015, are as follows:
	(Dollars in millions)	Amount
	Balance at June 27, 2014	$	537
	Goodwill acquired	337
	Foreign currency translation effect	(3		)
	Balance at April 3, 2015	$	871
	Other Intangible Assets
	Other intangible assets consist primarily of existing technology, customer relationships, in-process research and development and trade names acquired in business combinations. With the exception of in-process research and development, acquired intangibles are amortized on a straight-line basis over the respective estimated useful lives of the assets. Amortization is charged to Operating expenses in the Condensed Consolidated Statements of Operations. In-process research and development has been determined to have an indefinite useful life and is not amortized, but instead tested for impairment annually or more frequently if events or changes in circumstance indicate that the asset might be impaired. If the carrying amount of in-process research and development exceeds its fair value, an impairment loss is recognized in an amount equal to that excess. There were no impairment charges recognized for in-process research and development. Upon completion of the in-process research and development, the related assets will be accounted for as existing technology and will be amortized over their useful life.
	The carrying value of other intangible assets subject to amortization as of April 3, 2015, 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		$	173	$	(55	)	$	118	3.6 years
	Customer relationships		486		(259		)	227		2.6 years
	Trade names		27		(5		)	22		3.4 years
	Other intangible assets		28		(3		)	25		4.4 years
	Total amortizable other intangible assets		$	714	$	(322	)	$	392	3.1 years
	The carrying value of in-process research and development not subject to amortization was $18 million on April 3, 2015.
	The carrying value of other intangible assets subject to amortization as of June 27, 2014 is set forth in the following table:
	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	68	$	(18	)	$	50	2.9 years
	Customer relationships		450		(192		)	258		3.3 years
	Trade names		10		(1		)	9		3.1 years
	Other intangible assets		4		(1		)	3		4.4 years
	Total amortizable other intangible assets		$	532	$	(212	)	$	320	3.2 years
	The carrying value of in-process research and development not subject to amortization was $39 million on June 27, 2014.
	For the three and nine months ended April 3, 2015, amortization expense of other intangible assets was $40 million and $112 million. For the three and nine months ended March 28, 2014, amortization expense of other intangible assets was $26 million and $103 million. As of April 3, 2015, expected amortization expense for other intangible assets for each of the next five fiscal years and thereafter is as follows:
	(Dollars in millions)	Amount
	Remainder of 2015	$	40
	2016	139
	2017	120
	2018	60
	2019	22
	Thereafter	11
		$	392

Derivative_Financial_Instrumen

Derivative Financial Instruments

9 Months Ended

Apr. 03, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities Disclosure

Derivative Financial Instruments

The Company is exposed to market risks due to the volatility of interest rates, foreign currency exchange rates, and bond markets. 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 income (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 losses on cash flow hedges was $4 million and $1 million as of April 3, 2015 and June 27, 2014, respectively.

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 income (loss) are reclassified immediately into earnings and any subsequent changes in the fair value of such derivative instruments are immediately reflected in earnings. The Company did not recognize any net gains or losses related to the loss of hedge designation on discontinued cash flow hedges during the three and nine months ended April 3, 2015. As of April 3, 2015, the Company’s existing foreign currency forward exchange contracts mature within 12 months. The deferred amount currently recorded in Accumulated other comprehensive income (loss) expected to be recognized into earnings over the next 12 months is $5 million.

The following tables show the total notional value of the Company’s outstanding foreign currency forward exchange contracts as of April 3, 2015 and June 27, 2014:

As of April 3, 2015

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

36

Singapore Dollars

80

41

Chinese Renminbi

31

16

Euro

—

11

$

111

$

104

As of June 27, 2014

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

143

British Pound Sterling

25

—

Malaysian Ringgit

9

—

$

34

$

143

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 April 3, 2015, the notional investments underlying the TRS amounted to $98 million. The contract term of the TRS is through January 2016 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 tables show the Company’s derivative instruments measured at fair value as reflected in the Condensed Consolidated Balance Sheet as of April 3, 2015 and June 27, 2014:

As of April 3, 2015

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

—

Accrued expenses

$

(5

)

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

—

Accrued expenses

$

(3

)

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

—

$

(8

)

As of June 27, 2014

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

3

Accrued expenses

$

—

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

2

Accrued expenses

$

—

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

5

$

—

The following tables show the effect of the Company’s derivative instruments on the Condensed Consolidated Statement of Comprehensive Income and the Condensed Consolidated Statement of Operations for the three and nine months ended April 3, 2015:

(Dollars in millions)

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

Recognized

from

Reclassified

Income on

Recognized in

in OCI on

Accumulated

from

Derivatives

Income

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

(Effective

Income

OCI into

Portion and

Portion and

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

from

Excluded from

Portion)

Effectiveness

Effectiveness

Testing)

Testing) (a)

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

Foreign currency forward exchange contracts

$

(3

)

$

(13

)

Cost of revenue

$

(7

)

$

(9

)

Cost of revenue

$

1

$

1

Derivatives Not Designated as Hedging Instruments

Location of Gain or

Amount of Gain or

(Loss) Recognized in

(Loss) Recognized in

Income on Derivative

Income on Derivative

For the Three Months

For the Nine Months

Foreign currency forward exchange contracts

Other, net

$

1

$

(4

)

Total return swap

Operating expenses

$

2

$

2

___________________________________________

(a)

The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationships and $1 million related to the amount excluded from the assessment of hedge effectiveness for the three and nine months ended April 3, 2015, respectively.

The following tables show the effect of the Company’s derivative instruments on the Condensed Consolidated Statement of Comprehensive Income and the Condensed Consolidated Statement of Operations for the three and nine months ended March 28, 2014:

(Dollars in millions)

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

Recognized

from

Reclassified

Income on

Recognized in

in OCI on

Accumulated

from

Derivatives

Income

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

(Effective

Income

OCI into

Portion and

Portion and

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

from

Excluded from

Portion)

Effectiveness

Effectiveness

Testing)

Testing) (a)

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

Foreign currency forward exchange contracts

$

1

$

—

Cost of revenue

$

—

$

—

Cost of revenue

$

—

$

—

Derivatives Not Designated as Hedging Instruments

Location of Gain or

Amount of Gain or

(Loss) Recognized in

(Loss) Recognized in

Income on Derivatives

Income on Derivatives

For the Three Months

For the Nine Months

Foreign currency forward exchange contracts

Other, net

$

1

$

(4

)

___________________________________________

(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 nine months ended March 28, 2014.

Fair_Value

Fair Value	9 Months Ended
	Apr. 03, 2015
Fair Value Disclosures [Abstract]
Fair Value	Fair Value
	Measurement of Fair Value
	Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and it considers assumptions that market participants would use when pricing the asset or liability.
	Fair Value Hierarchy
	A fair value hierarchy is based on whether the market participant assumptions used in determining fair value are obtained from independent sources (observable inputs) or reflects the Company’s own assumptions of market participant valuation (unobservable inputs). A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels of inputs that may be used to measure fair value:
	Level 1 — Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities;
	Level 2 — Quoted prices for identical assets and liabilities in markets that are inactive; quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly; or
	Level 3 — Prices or valuations that require inputs that are both unobservable and significant to the fair value measurement.
	The Company considers an active market to be one in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis, and views an inactive market as one in which there are few transactions for the asset or liability, the prices are not current, or price quotations vary substantially either over time or among market makers. Where appropriate the Company’s or the counterparty’s non-performance risk is considered in determining the fair values of liabilities and assets, respectively.
	Items Measured at Fair Value on a Recurring Basis
	The following tables present the Company’s assets and liabilities, by financial instrument type and balance sheet line item that are measured at fair value on a recurring basis, excluding accrued interest components, as of April 3, 2015:
		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	$	705		$	—		$	—		$	705
	Certificates of deposit	—			1,481			—			1,481
	Corporate bonds	—			6			—			6
	Total cash equivalents and short-term investments	705			1,487			—			2,192
	Restricted cash and investments:
	Certificates of deposit	—			4			—			4
	Total assets	$	705		$	1,491		$	—		$	2,196
	Liabilities:
	Derivative liabilities	$	—		$	8		$	—		$	8
	Total liabilities	$	—		$	8		$	—		$	8
		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	$	705		$	1,481		$	—		$	2,186
	Short-term investments	—			6			—			6
	Restricted cash and investments	—			4			—			4
	Total assets	$	705		$	1,491		$	—		$	2,196
	Liabilities:
	Accrued expenses	$	—		$	8		$	—		$	8
	Total liabilities	$	—		$	8		$	—		$	8
	The following tables present the Company’s assets and liabilities, by financial instrument type and balance sheet line item that are measured at fair value on a recurring basis, excluding accrued interest components, as of June 27, 2014:
		Fair Value Measurements at Reporting Date Using
	(Dollars in millions)	Quoted			Significant			Significant			Total
		Prices in			Other			Unobservable			Balance
		Active			Observable			Inputs
		Markets for			Inputs			(Level 3)
		Identical			(Level 2)
		Instruments
		(Level 1)
	Assets:
	Money market funds	$	793		$	—		$	—		$	793
	Commercial paper	—			1,261			—			1,261
	Certificates of deposit	—			269			—			269
	Corporate bonds	—			6			—			6
	Total cash equivalents and short-term investments	793			1,536			—			2,329
	Restricted cash and investments:
	Certificates of deposit	—			4			—			4
	Derivative assets	—			5			—			5
Total assets	$	793		$	1,545		$	—		$	2,338
Liabilities:
Derivative liabilities	$	—		$	—		$	—		$	—
Total liabilities	$	—		$	—		$	—		$	—
	Fair Value Measurements at Reporting Date Using
(Dollars in millions)	Quoted			Significant			Significant			Total
	Prices in			Other			Unobservable			Balance
	Active			Observable			Inputs
	Markets for			Inputs			(Level 3)
	Identical			(Level 2)
	Instruments
	(Level 1)
Assets:
Cash and cash equivalents	$	793		$	1,516		$	—		$	2,309
Short-term investments	—			20			—			20
Restricted cash and investments	—			4			—			4
Other assets, net	—			5			—			5
Total assets	$	793		$	1,545		$	—		$	2,338
Liabilities:
Accrued expenses	$	—		$	—		$	—		$	—
Total liabilities	$	—		$	—		$	—		$	—
The Company classifies items in Level 1 if the financial 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 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 April 3, 2015, 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 and the TRS. 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 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 April 3, 2015 and June 27, 2014 totaled $105 million and $46 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:
		April 3, 2015						June 27, 2014
(Dollars in millions)		Carrying			Estimated			Carrying			Estimated
		Amount			Fair Value			Amount			Fair Value
6.8% Senior Notes due October 2016		$	—		$	—		$	335		$	374
3.75% Senior Notes due November 2018		800			832			800			820
6.875% Senior Notes due May 2020		474			492			534			578
7.00% Senior Notes due November 2021		159			172			251			284
4.75% Senior Notes due June 2023		1,000			1,052			1,000			1,009
4.75% Senior Notes due January 2025		1,000			1,040			1,000			995
5.75% Senior Notes due December 2034		498			542			—			—
Long-term debt		$	3,931		$	4,130		$	3,920		$	4,060

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Apr. 03, 2015
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 318,076,549 shares were outstanding as of April 3, 2015, and 100,000,000 preferred shares, par value $0.00001, of which none were issued or outstanding as of April 3, 2015.
	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 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 April 3, 2015, $0.6 billion remained available for repurchase under the existing repurchase authorization limit.
	The following table sets forth information with respect to repurchases of the Company’s shares during the nine months ended April 3, 2015:
	(In millions)	Number of	Dollar Value
		Shares	of Shares
		Repurchased	Repurchased
	Repurchased during the three months ended October 3, 2014	3	$	183
	Repurchased during the three months ended January 2, 2015 (1)	0	18
	Repurchased during the three months ended April 3, 2015	12	$	706
	Fiscal year repurchased through April 3, 2015	15	$	907
	_______________________
	(1) A total of 0.3 million shares were repurchased during the three months ended January 2, 2015.
	On April 22, 2015, the Board of Directors authorized the Company to repurchase an additional $2.5 billion of its outstanding ordinary shares.

Compensation

Compensation	9 Months Ended
	Apr. 03, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation	Compensation
	The Company recorded approximately $33 million and $106 million of stock-based compensation expense during the three and nine months ended April 3, 2015, respectively. The Company recorded approximately $30 million and $87 million of stock-based compensation expense during the three and nine months ended March 28, 2014, respectively.

Guarantees

Guarantees	9 Months Ended
	Apr. 03, 2015
Guarantees [Abstract]
Financial Guarantees and Warranties	Guarantees
	Indemnifications to Officers and Directors
	On May 4, 2009, Seagate Technology, an exempted company incorporated with limited liability under the laws of the Cayman Islands (“Seagate-Cayman”), then the parent company, entered into a new form of indemnification agreement (the “Revised Indemnification Agreement”) with 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 consolidated financial statements with respect to these indemnification obligations.
	Intellectual Property Indemnification Obligations
	The Company has entered into agreements with customers and suppliers that include limited intellectual property indemnification obligations that are customary in the industry. These guarantees generally require the Company to compensate the other party for certain damages and costs incurred as a result of third party intellectual property claims arising from these transactions. The nature of the intellectual property indemnification obligations prevents the Company from making a reasonable estimate of the maximum potential amount it could be required to pay to its customers and suppliers. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification obligations.
	Product Warranty
	The Company estimates probable product warranty costs at the time revenue is recognized. The Company generally warrants its products for a period of 1 to 5 years. The Company uses estimated repair or replacement costs and uses statistical modeling to estimate product return rates in order to determine its warranty obligation. Changes in the Company’s product warranty liability during the three and nine months ended April 3, 2015 and March 28, 2014 were as follows:
		For the Three Months Ended						For the Nine Months Ended
	(Dollars in millions)	April 3,			March 28,			April 3,			March 28,
		2015			2014			2015			2014
	Balance, beginning of period	$	282		$	300		$	273		$	320
	Warranties issued	36			43			116			139
	Repairs and replacements	(45		)	(55		)	(145		)	(174		)
	Changes in liability for pre-existing warranties, including expirations	—			(2		)	21			1
	Warranty liability assumed from business acquisitions	—			—			8			—
	Balance, end of period	$	273		$	286		$	273		$	286

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Apr. 03, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	Basic earnings per share is computed by dividing income available to shareholders by the weighted-average number of shares outstanding during the period. Diluted earnings per share is computed by dividing income available to shareholders by the weighted-average number of shares outstanding during the period and the number of additional shares that would have been outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include outstanding options, unvested restricted share units and shares to be purchased under the ESPP. The dilutive effect of potentially dilutive securities is reflected in diluted earnings per share by application of the treasury stock method. Under the treasury stock method, an increase in fair market value of the Company’s share price can result in a greater dilutive effect from potentially dilutive securities. The following table sets forth the computation of basic and diluted net income per share attributable to the shareholders of Seagate Technology plc:
		For the Three Months Ended				For the Nine Months Ended
	(In millions, except per share data)	April 3,		March 28,		April 3,		March 28,
		2015		2014		2015		2014
	Numerator:
	Net income attributable to Seagate Technology plc	$	291	$	395	$	1,605	$	1,250
	Number of shares used in per share calculations:
	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	323		327		326		340
	Weighted-average effect of dilutive securities:
	Employee equity award plans	7		11		8		11
	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	330		338		334		351
	Net income per share attributable to Seagate Technology plc shareholders:
	Basic	$	0.9	$	1.21	$	4.92	$	3.68
	Diluted	$	0.88	$	1.17	$	4.81	$	3.56
	The anti-dilutive shares related to employee equity award plans that were excluded from the computation of diluted net income per share attributable to Seagate Technology plc were immaterial for the three and nine months ended April 3, 2015 and March 28, 2014.

Legal_Environmental_and_Other_

Legal, Environmental and Other Contingencies	9 Months Ended
	Apr. 03, 2015
Commitments and Contingencies Disclosure [Abstract]
Legal, Environmental and Other Contingencies	Legal, Environmental and Other Contingencies
	The Company assesses the probability of an unfavorable outcome of all its material litigation, claims, or assessments to determine whether a liability had been incurred and whether it is probable that one or more future events will occur confirming the fact of the loss. In the event that an unfavorable outcome is determined to be probable and the amount of the loss can be reasonably estimated, the Company establishes an accrual for the litigation, claim or assessment. In addition, in the event an unfavorable outcome is determined to be less than probable, but reasonably possible, the Company will disclose an estimate of the possible loss or range of such loss; however, when a reasonable estimate cannot be made, the Company will provide disclosure to that effect. Litigation is inherently uncertain and may result in adverse rulings or decisions. Additionally, the Company may enter into settlements or be subject to judgments that may, individually or in the aggregate, have a material adverse effect on its results of operations. Accordingly, actual results could differ materially.
	Intellectual Property Litigation
	Convolve, Inc. (“Convolve”) and Massachusetts Institute of Technology (“MIT”) v. Seagate Technology LLC, et al.—On July 13, 2000, Convolve and MIT filed suit against Compaq Computer Corporation and Seagate Technology LLC in the U.S. District Court for the Southern District of New York, alleging infringement of U.S. Patent Nos. 4,916,635 (the “'635 patent”) and U.S. Patent No. 5,638,267 (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. On January 16, 2002, Convolve filed an amended complaint, alleging defendants infringe US Patent No. 6,314,473 (the “'473 patent”). 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 July 11, 2014, the district court granted the Company’s summary judgment motion regarding Convolve’s only remaining cause of action, which alleged infringement of the ‘473 patent. The court entered judgment in favor of the Company on July 14, 2014. Convolve filed a notice of appeal on August 13, 2014. The court of appeals has not yet set a date for oral argument. In view of the rulings made by the district court and the Court of Appeals 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. On March 31, 2014, the district court granted Seagate’s summary judgment motion and entered judgment in favor of Seagate. Mr. Shukh filed a notice of appeal on April 7, 2014. Oral argument at the court of appeals has been scheduled for June 4, 2015. 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 (“ITC”) seeking an investigation pursuant to Section 337 of the Tariff Act of 1930, as amended (“Section 337”). 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. On March 21, 2014, the Administrative Law Judge (“ALJ”) issued an Initial Determination in favor of Seagate and LSI. On July 21, 2014, the Commission gave notice that it had determined to affirm in part, reverse in part and vacate in part the ALJ’s Initial Determination; the Commission found that no violation of Section 337 by Seagate or LSI has occurred based on findings that certain of the patent claims at issue were invalid, and that Realtek failed to show the existence of an industry in the U.S. that exploits the patent. Realtek filed a notice of appeal on September 18, 2014. By agreement of the parties, Realtek’s appeal was dismissed on October 17, 2014. In view of the Commission’s July 21, 2014 decision and the October 17, 2014 dismissal of Realtek’s appeal, the Company believes that this matter will not result in any loss or other adverse result.
	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. The trial is scheduled to begin July 11, 2016. On April 27, 2015, the district court ordered a stay of the case until October 15, 2015, in view of proceedings regarding the ‘995 and ‘057 Patents before the Patent Trial and Appeal Board of the U.S. Patent and Trademark Office. 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.
	Seagate Technology LLC v. Western Digital Corp. On October 8, 2014, the Minnesota Supreme Court ruled that the arbitration award in favor of the Company in its case against Western Digital for the misappropriation of the Company’s trade secrets should be confirmed. In the arbitration award, issued on January 23, 2012, the arbitrator determined that Western Digital and its former employee had misappropriated the Company’s trade secrets. The arbitrator awarded the Company $525 million in compensatory damages and, after adding interest, issued a final award of $630 million. Interest on the final award has been accruing at 10%. On October 14, 2014, the Company received a partial payment from Western Digital in the amount of $773 million. The amount of the final award, less litigation and other related costs, has been recorded by the Company in Gain on arbitration award, net, and the remaining amount received has been recorded in Other, net.
	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 and server storage products, 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.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Apr. 03, 2015
Accounting Policies [Abstract]
Consolidation, Policy	Basis of Presentation and Consolidation
	The unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned and majority-owned subsidiaries, after elimination of intercompany transactions and balances.
	The preparation of financial statements in accordance with U.S. generally accepted accounting principles 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 27, 2014, are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (“SEC”) on August 7, 2014. 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 27, 2014, and the notes thereto, are adequate to make the information presented not misleading.
New Accounting Pronouncements, Policy	May 2014, the FASB issued ASU 2014-09 (ASC Topic 606), Revenue from Contracts with Customers. The ASU outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. It also requires entities to disclose both quantitative and qualitative information that enable financial statements users to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The ASU, as currently proposed, will be effective for the Company's first quarter of fiscal year 2019. The Company is in the process of assessing the impact, if any, of ASU 2014-09 on its consolidated financial statements.
	In April 2015, the FASB issued ASU 2015-03 (ASC Subtopic 835-30), Interest-Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2015. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this new guidance will not have a material impact on the Company’s consolidated financial statements and disclosures.
	8

Balance_Sheet_Information_Tabl

Balance Sheet Information (Tables)	9 Months Ended
	Apr. 03, 2015
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	$	705		$	—		$	705
	Corporate bonds	6			—			6
	Certificates of deposit	1,485			—			1,485
		$	2,196		$	—		$	2,196
	Included in Cash and cash equivalents							$	2,186
	Included in Short-term investments							6
	Included in Restricted cash and investments							4
	Total							$	2,196
	(Dollars in millions)	Amortized			Unrealized			Fair
		Cost			Gain/(Loss)			Value
	Available-for-sale securities:
	Money market funds	$	793		$	—		$	793
	Commercial paper	1,261			—			1,261
	Corporate bonds	6			—			6
	Certificates of deposit	273			—			273
	Total	$	2,333		$	—		$	2,333
	Included in Cash and cash equivalents							$	2,309
	Included in Short-term investments							20
	Included in Restricted cash and investments							4
	Total							$	2,333
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	$	2,190		$	2,190
	Due in 1 to 5 years	6			6
	Thereafter	—			—
	Total	$	2,196		$	2,196
Inventories
	(Dollars in millions)	April 3,			June 27,
		2015			2014
	Raw materials and components	$	366		$	324
	Work-in-process	288			267
	Finished goods	429			394
		$	1,083		$	985
Property, Equipment and Leasehold Improvements, net
	(Dollars in millions)	April 3,			June 27,
		2015			2014
	Property, equipment and leasehold improvements	$	9,403		$	8,979
	Accumulated depreciation and amortization	(7,221		)	(6,843		)
		$	2,182		$	2,136
Schedule of accumulated other comprehensive income (loss)
	(Dollars in millions)	Unrealized Gains (Losses) on Cash Flow Hedges			Unrealized Gains (Losses) on Marketable Securities (a)			Unrealized Gains (Losses) on post-retirements			Foreign currency translation adjustments			Total
	Balance at June 27, 2014	$	(1	)	$	—		$	(10	)	$	9		$	(2	)
	Other comprehensive income (loss) before reclassifications	(12		)	—			—			(28		)	(40		)
	Amounts reclassified from AOCI	9			—			—			—			9
	Other comprehensive income (loss)	(3		)	—			—			(28		)	(31		)
	Balance at April 3, 2015	$	(4	)	$	—		$	(10	)	$	(19	)	$	(33	)
	Balance at June 28, 2013	$	—		$	(3	)	$	(10	)	$	—		$	(13	)
	Other comprehensive income (loss) before reclassifications	—			1			1			9			11
	Amounts reclassified from AOCI	—			—			—			—			—
	Other comprehensive income (loss)	—			1			1			9			11
	Balance at March 28, 2014	$	—		$	(2	)	$	(9	)	$	9		$	(2	)
	___________________________________________
	(a)The cost of a security sold or the amount reclassified out of AOCI into earnings was determined using specific identification.

Debt_Tables

Debt (Tables)	9 Months Ended
	Apr. 03, 2015
Debt Disclosure [Abstract]
Future principal payments on long-term debt
	Fiscal Year	Amount
	Remainder of 2015	$	474
	2016	—
	2017	—
	2018	—
	2019	800
	Thereafter	2,659
		$	3,933

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Apr. 03, 2015
Business Acquisition [Line Items]
Fair value of assets acquired and liabilities assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Inventories	$	37
	Property, plant and equipment	22
	Intangible assets	141
	Other assets	6
	Goodwill	337
	Total assets	543
	Liabilities	(93		)
	Total liabilities	(93		)
	Total	$	450
Xyratex Ltd [Member]
Business Acquisition [Line Items]
Fair value of assets acquired and liabilities assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the acquisition date:
	(Dollars in millions)	Amount
	Cash and cash equivalents	$	91
	Accounts receivable, net	67
	Inventories	111
	Other current and non-current assets	28
	Property, plant and equipment	55
	Intangible assets	80
	Goodwill	60
	Total assets	492
	Accounts payable and accrued expenses	(116		)
	Total liabilities	(116		)
	Total	$	376

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Apr. 03, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the carrying amount of goodwill
	(Dollars in millions)	Amount
	Balance at June 27, 2014	$	537
	Goodwill acquired	337
	Foreign currency translation effect	(3		)
	Balance at April 3, 2015	$	871
Carrying value of intangible assets
	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	68	$	(18	)	$	50	2.9 years
	Customer relationships		450		(192		)	258		3.3 years
	Trade names		10		(1		)	9		3.1 years
	Other intangible assets		4		(1		)	3		4.4 years
	Total amortizable other intangible assets		$	532	$	(212	)	$	320	3.2 years
	(Dollars in millions)		Gross Carrying		Accumulated			Net Carrying		Weighted Average
			Amount		Amortization			Amount		Remaining Useful Life
	Existing technology		$	173	$	(55	)	$	118	3.6 years
	Customer relationships		486		(259		)	227		2.6 years
	Trade names		27		(5		)	22		3.4 years
	Other intangible assets		28		(3		)	25		4.4 years
	Total amortizable other intangible assets		$	714	$	(322	)	$	392	3.1 years
Expected amortization expense for acquisition-related intangible assets
	(Dollars in millions)	Amount
	Remainder of 2015	$	40
	2016	139
	2017	120
	2018	60
	2019	22
	Thereafter	11
		$	392

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)

9 Months Ended

Apr. 03, 2015

Mar. 28, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of notional value of outstanding foreign currency forward exchange contracts

As of April 3, 2015

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

36

Singapore Dollars

80

41

Chinese Renminbi

31

16

Euro

—

11

$

111

$

104

As of June 27, 2014

(Dollars in millions)

Contracts

Contracts Not

Designated as

Designated as

Hedges

Hedges

Thai Baht

$

—

$

143

British Pound Sterling

25

—

Malaysian Ringgit

9

—

$

34

$

143

Schedule of gross fair value of derivative instruments

As of April 3, 2015

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

—

Accrued expenses

$

(5

)

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

—

Accrued expenses

$

(3

)

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

—

$

(8

)

As of June 27, 2014

Asset Derivatives

Liability Derivatives

(Dollars in millions)

Balance Sheet

Fair Value

Balance Sheet

Fair Value

Location

Location

Derivatives designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

3

Accrued expenses

$

—

Derivatives not designated as hedging instruments:

Foreign currency forward exchange contracts

Other current assets

$

2

Accrued expenses

$

—

Total return swap

Other current assets

—

Accrued expenses

—

Total derivatives

$

5

$

—

Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations

(Dollars in millions)

(Dollars in millions)

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Derivatives Designated as Hedging Instruments

Amount of

Location of

Amount of

Location of

Amount of

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

Gain or

Gain or (Loss)

Gain or

Gain or (Loss)

Gain

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

(Loss)

Reclassified

(Loss)

Recognized in

or (Loss)

Recognized

from

Reclassified

Income on

Recognized in

Recognized

from

Reclassified

Income on

Recognized in

in OCI on

Accumulated

from

Derivatives

Income

in OCI on

Accumulated

from

Derivatives

Income

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

Derivatives

OCI into

Accumulated

(Ineffective

(Ineffective

(Effective

Income

OCI into

Portion and

Portion and

(Effective

Income

OCI into

Portion and

Portion and

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

Income

Amount Excluded

Amount

Portion)

(Effective

from

Excluded from

Portion)

(Effective

from

Excluded from

Portion)

Effectiveness

Effectiveness

Portion)

Effectiveness

Effectiveness

Testing)

Testing) (a)

Testing)

Testing) (a)

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

Foreign currency forward exchange contracts

$

(3

)

$

(13

)

Cost of revenue

$

(7

)

$

(9

)

Cost of revenue

$

1

$

1

Foreign currency forward exchange contracts

$

1

$

—

Cost of revenue

$

—

$

—

Cost of revenue

$

—

$

—

Derivatives Not Designated as Hedging Instruments

Location of Gain or

Amount of Gain or

Derivatives Not Designated as Hedging Instruments

Location of Gain or

Amount of Gain or

(Loss) Recognized in

(Loss) Recognized in

(Loss) Recognized in

(Loss) Recognized in

Income on Derivative

Income on Derivative

Income on Derivatives

Income on Derivatives

For the Three Months

For the Nine Months

For the Three Months

For the Nine Months

Foreign currency forward exchange contracts

Other, net

$

1

$

(4

)

Foreign currency forward exchange contracts

Other, net

$

1

$

(4

)

Total return swap

Operating expenses

$

2

$

2

___________________________________________

___________________________________________

(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 nine months ended March 28, 2014.

(a)

The amount of gain or (loss) recognized in income represents $0 related to the ineffective portion of the hedging relationships and $1 million related to the amount excluded from the assessment of hedge effectiveness for the three and nine months ended April 3, 2015, respectively.

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended
	Apr. 03, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on 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	$	705		$	—		$	—		$	705
	Certificates of deposit	—			1,481			—			1,481
	Corporate bonds	—			6			—			6
	Total cash equivalents and short-term investments	705			1,487			—			2,192
	Restricted cash and investments:
	Certificates of deposit	—			4			—			4
	Total assets	$	705		$	1,491		$	—		$	2,196
	Liabilities:
	Derivative liabilities	$	—		$	8		$	—		$	8
	Total liabilities	$	—		$	8		$	—		$	8
		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	$	793		$	—		$	—		$	793
	Commercial paper	—			1,261			—			1,261
	Certificates of deposit	—			269			—			269
	Corporate bonds	—			6			—			6
	Total cash equivalents and short-term investments	793			1,536			—			2,329
	Restricted cash and investments:
	Certificates of deposit	—			4			—			4
	Derivative assets	—			5			—			5
	Total assets	$	793		$	1,545		$	—		$	2,338
	Liabilities:
	Derivative liabilities	$	—		$	—		$	—		$	—
	Total liabilities	$	—		$	—		$	—		$	—
Schedule of Fair Value, by Balance Sheet Grouping, Measured on 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:
	Cash and cash equivalents	$	705		$	1,481		$	—		$	2,186
	Short-term investments	—			6			—			6
	Restricted cash and investments	—			4			—			4
	Total assets	$	705		$	1,491		$	—		$	2,196
	Liabilities:
	Accrued expenses	$	—		$	8		$	—		$	8
	Total liabilities	$	—		$	8		$	—		$	8
		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	$	793		$	1,516		$	—		$	2,309
	Short-term investments	—			20			—			20
	Restricted cash and investments	—			4			—			4
	Other assets, net	—			5			—			5
	Total assets	$	793		$	1,545		$	—		$	2,338
	Liabilities:
	Accrued expenses	$	—		$	—		$	—		$	—
	Total liabilities	$	—		$	—		$	—		$	—
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
			April 3, 2015						June 27, 2014
	(Dollars in millions)		Carrying			Estimated			Carrying			Estimated
			Amount			Fair Value			Amount			Fair Value
	6.8% Senior Notes due October 2016		$	—		$	—		$	335		$	374
	3.75% Senior Notes due November 2018		800			832			800			820
	6.875% Senior Notes due May 2020		474			492			534			578
	7.00% Senior Notes due November 2021		159			172			251			284
	4.75% Senior Notes due June 2023		1,000			1,052			1,000			1,009
	4.75% Senior Notes due January 2025		1,000			1,040			1,000			995
	5.75% Senior Notes due December 2034		498			542			—			—
	Long-term debt		$	3,931		$	4,130		$	3,920		$	4,060

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	9 Months Ended
	Apr. 03, 2015
Equity [Abstract]
Schedule of Share Repurchases
	(In millions)	Number of	Dollar Value
		Shares	of Shares
		Repurchased	Repurchased
	Repurchased during the three months ended October 3, 2014	3	$	183
	Repurchased during the three months ended January 2, 2015 (1)	0	18
	Repurchased during the three months ended April 3, 2015	12	$	706
	Fiscal year repurchased through April 3, 2015	15	$	907
	_______________________
	(1) A total of 0.3 million shares were repurchased during the three months ended January 2, 2015.
	On April 22, 2015, the Board of Directors authorized the Company to repurchase an additional $2.5 billion of its outstanding ordinary shares.

Guarantees_Tables

Guarantees (Tables)	9 Months Ended
	Apr. 03, 2015
Guarantees [Abstract]
Schedule of Product Warranty Liability
		For the Three Months Ended						For the Nine Months Ended
	(Dollars in millions)	April 3,			March 28,			April 3,			March 28,
		2015			2014			2015			2014
	Balance, beginning of period	$	282		$	300		$	273		$	320
	Warranties issued	36			43			116			139
	Repairs and replacements	(45		)	(55		)	(145		)	(174		)
	Changes in liability for pre-existing warranties, including expirations	—			(2		)	21			1
	Warranty liability assumed from business acquisitions	—			—			8			—
	Balance, end of period	$	273		$	286		$	273		$	286

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Apr. 03, 2015
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted net income (loss) per share
		For the Three Months Ended				For the Nine Months Ended
	(In millions, except per share data)	April 3,		March 28,		April 3,		March 28,
		2015		2014		2015		2014
	Numerator:
	Net income attributable to Seagate Technology plc	$	291	$	395	$	1,605	$	1,250
	Number of shares used in per share calculations:
	Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	323		327		326		340
	Weighted-average effect of dilutive securities:
	Employee equity award plans	7		11		8		11
	Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	330		338		334		351
	Net income per share attributable to Seagate Technology plc shareholders:
	Basic	$	0.9	$	1.21	$	4.92	$	3.68
	Diluted	$	0.88	$	1.17	$	4.81	$	3.56

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014	Jun. 28, 2013
Schedule of Fiscal Years [Line Items]
Number of Weeks in Fiscal Year			53		52
Number Of Weeks In Quarter	13	13	40	39
Minimum [Member]
Schedule of Fiscal Years [Line Items]
Number of Weeks in Fiscal Year			52		52
Maximum [Member]
Schedule of Fiscal Years [Line Items]
Number of Weeks in Fiscal Year			53		53

Balance_Sheet_Information_Bala

Balance Sheet Information Balance Sheet Information (Narrative) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]
Cash and investments held as collateral at banks for various performance obligations	$4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Cost Basis of Other-than-temporarily Imparied Securities	$0	$0

Balance_Sheet_Information_Summ

Balance Sheet Information (Summary of fair value and amortized cost of investments, by major type)(Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Available-for-sale securities:
Available-for-sale securities, Amortized Cost	$2,196	$2,333
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	2,196	2,333
Total available-for-sale and trading securities
Included in Short-term investments	6	20
Included in Restricted cash and investments	4	4
Fair Value, Total Balance [Member]
Total available-for-sale and trading securities
Investments, Total Fair Value	2,196	2,333
Included in Cash and cash equivalents	2,186	2,309
Included in Short-term investments	6	20
Included in Restricted cash and investments	4	4
Investments, Total Fair Value	2,196	2,333
Money market funds [Member]
Available-for-sale securities:
Available-for-sale securities, Amortized Cost	705	793
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	705	793
Commercial paper [Member]
Available-for-sale securities:
Available-for-sale securities, Amortized Cost		1,261
Available-for-sale securities, Unrealized Gain/(Loss)		0
Available-for-sale securities, Fair Value		1,261
Corporate bonds [Member]
Available-for-sale securities:
Available-for-sale securities, Amortized Cost	6	6
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	6	6
Certificates of deposit [Member]
Available-for-sale securities:
Available-for-sale securities, Amortized Cost	1,485	273
Available-for-sale securities, Unrealized Gain/(Loss)	0	0
Available-for-sale securities, Fair Value	$1,485	$273

Balance_Sheet_Information_Fair

Balance Sheet Information (Fair value and amortized cost of available-for-sale securities by contractual maturity) (Details) (USD $)	Apr. 03, 2015
In Millions, unless otherwise specified
Amortized Cost
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis	$2,190
AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortize	6
AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost	0
Total Amortized Cost	2,196
Fair Value
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value	2,190
Available-for-sale Securities, Debt Maturities, after One Through Five Years, at Fair Value	6
Available-for-sale Securities, Debt Maturities, after Five Years Fair Value	0
Total Fair Value	$2,196

Balance_Sheet_Information_Inve

Balance Sheet Information (Inventories) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Inventory, Net [Abstract]
Raw materials and components	$366	$324
Work-in-process	288	267
Finished goods	429	394
Total inventories	$1,083	$985

Balance_Sheet_Information_Prop

Balance Sheet Information (Property, Equipment and Leasehold Improvements, net) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Property, Plant and Equipment, Net [Abstract]
Property, equipment and leasehold improvements	$9,403	$8,979
Accumulated depreciation and amortization	-7,221	-6,843
Total property, equipment and leasehold improvements, net	$2,182	$2,136

Balance_Sheet_Information_Accu

Balance Sheet Information (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Unrealized Gains (Losses) on Cash Flow Hedges
Beginning Balance			($1)	$0
Other comprehensive income (loss) before reclassifications	-3	1	-12	0
Amounts reclassified from AOCI	-7	0	-9	0
Other comprehensive income (loss)	4	1	-3	0
Ending Balance	-4	0	-4	0
Unrealized Gains (Losses) on Marketable Securities (a)
Beginning Balance			0	-3
Other comprehensive income (loss) before reclassifications	0	0	0	1
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive income (loss)	0	0	0	1
Ending Balance	0	-2	0	-2
Unrealized Gains (Losses) on post-retirements
Beginning Balance			-10	-10
Other comprehensive income (loss) before reclassifications	0	0	0	1
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive income (loss)	0	0	0	1
Ending Balance	-10	-9	-10	-9
Foreign currency translation adjustments
Beginning Balance			9	0
Other comprehensive income (loss) before reclassifications			-28	9
Amounts reclassified from AOCI			0	0
Other comprehensive income (loss)	-12	4	-28	9
Ending Balance	-19	9	-19	9
Total
Beginning Balance			-2	-13
Other comprehensive income before reclassifications			-40
Amounts reclassified from AOCI			9	0
Total other comprehensive income (loss), net of tax	-8	5	-31	11
Accumulated other comprehensive loss	($33)	($2)	($33)	($2)

Debt_Narrative_Details

Debt (Narrative) (Details) (USD $)	9 Months Ended		3 Months Ended	0 Months Ended
	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Dec. 02, 2014	Jan. 15, 2015	Apr. 30, 2013	Jan. 18, 2011	7-May-15
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$700,000,000	$500,000,000
Sub-limit for issuance of letters of credit under revolving credit facility							75,000,000
Line of Credit Facility Letters of Credit Outstanding	0		0
Loss on repurchase of debt	52,000,000	7,000,000
Senior Notes 6.8 Percent due October 2016 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	600,000,000		600,000,000
Stated interest rate (as a percent)	6.80%		6.80%
Senior Notes 3.75 Percent due November 2018 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	800,000,000		800,000,000
Stated interest rate (as a percent)	3.75%		3.75%
Senior Notes 6.875 Percent due May 2020 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	600,000,000		600,000,000
Stated interest rate (as a percent)	6.88%		6.88%
Repayment of Long-term Debt			1,000,000
Senior Notes 7.00 Percent Due November 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	600,000,000		600,000,000
Stated interest rate (as a percent)	7.00%		7.00%
Senior Notes 4.75 Percent Due June 2023 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	1,000,000,000		1,000,000,000
Stated interest rate (as a percent)	4.75%		4.75%
Senior Notes 4.75 Percent Due January 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	1,000,000,000		1,000,000,000
Stated interest rate (as a percent)	4.75%		4.75%
Senior Note 5.75 percent Due December 2034 [Domain]
Debt Instrument [Line Items]
Aggregate principal amount	500,000,000		500,000,000	500,000,000
Stated interest rate (as a percent)	5.75%		5.75%	5.75%
Debt Instrument, Basis Spread on Variable Rate				0.05%
Subsequent Event [Member] | Senior Notes 6.875 Percent due May 2020 [Member]
Debt Instrument [Line Items]
Debt Redemption Price								1,034.38
Debt Instrument Par Value								$1,000

Debt_Future_principal_payments

Debt (Future principal payments on long-term debt) (Details) (USD $)	Apr. 03, 2015
In Millions, unless otherwise specified
Debt Disclosure [Abstract]
Remainder of 2015	$474
2016	0
2017	0
2018	0
2019	800
Thereafter	2,659
Total future principal payments on long-term debt	$3,933

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income Tax Expense (Benefit)	$13	($5)	$216	$22
Discrete tax (benefits) charges		14	-181	-7
Domestic federal statutory rate (as a percent)			25.00%	25.00%
Unrecognized Tax Benefits, Period Increase (Decrease)			39
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			45
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations			4
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions			8
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions			2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	76		76
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	$3		$3

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)	0 Months Ended	9 Months Ended	0 Months Ended	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 02, 2014	Apr. 03, 2015	Mar. 31, 2014	Jun. 27, 2014
LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]
Business Acquisition [Line Items]
Cash paid for consideration	$450
Business Combination, Acquisition Related Costs		1
Xyratex Ltd [Member]
Business Acquisition [Line Items]
Accounts receivable, net			67
Business Acquisition Costs Of Acquired Entity Cash Paid Per Share			$13.25
Cash paid for consideration			376
Business Combination, Acquisition Related Costs				$10

Acquisitions_Fair_Value_Of_Ass

Acquisitions (Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014	Sep. 02, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Business Acquisition [Line Items]
Goodwill	$871	$537
Liabilities	-6,845	-6,660
LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]
Business Acquisition [Line Items]
Inventories			37
Property, plant and equipment			22
Intangible assets			141
Other current and non-current assets			6
Goodwill			337
Total assets			543
Liabilities			-93
Total			450
Intangible assets			141
Xyratex Ltd [Member]
Business Acquisition [Line Items]
Cash and cash equivalents				91
Accounts receivable, net				67
Inventories				111
Other current and non-current assets				28
Property, plant and equipment				55
Intangible assets				80
Goodwill				60
Total assets				492
Accounts payable and accrued expenses				-116
Total liabilities				-116
Total				376
Intangible assets				$41

Acquisitions_Fair_Value_Of_Fin

Acquisitions (Fair Value Of Finite-Lived Intangible Assets Acquired) (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Sep. 02, 2014	Mar. 31, 2014
LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member]
Intangible assets acquired
Acquired identifiable intangible asset, Amount	$141
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	141
LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member] | Existing technology [Member]
Intangible assets acquired
Acquired identifiable intangible asset, Weighted Average Useful Life	3 years 6 months
Acquired identifiable intangible asset, Amount	84
LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member] | Customer relationships [Member]
Intangible assets acquired
Acquired identifiable intangible asset, Weighted Average Useful Life	3 years 9 months
Acquired identifiable intangible asset, Amount	40
LSIbs Accelerated Solutions Division (bASDb) and Flash Components Division (bFCDb) [Member] | Trade name [Member]
Intangible assets acquired
Acquired identifiable intangible asset, Weighted Average Useful Life	4 years 6 months
Acquired identifiable intangible asset, Amount	17
Xyratex Ltd [Member]
Intangible assets acquired
Acquired identifiable intangible asset, Weighted Average Useful Life		4 years 9 months
Acquired identifiable intangible asset, Amount		41
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		80
Xyratex Ltd [Member] | Existing technology [Member]
Intangible assets acquired
Acquired identifiable intangible asset, Weighted Average Useful Life		5 years 6 months
Acquired identifiable intangible asset, Amount		23
Xyratex Ltd [Member] | Customer relationships [Member]
Intangible assets acquired
Acquired identifiable intangible asset, Weighted Average Useful Life		3 years 11 months
Acquired identifiable intangible asset, Amount		18
In Process Research and Development [Member] | Xyratex Ltd [Member]
Intangible assets acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		$39

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014	Jun. 27, 2014
Indefinite-lived Intangible Assets [Line Items]
Amortization of intangibles	$40,000,000	$26,000,000	$112,000,000	$103,000,000
In Process Research and Development [Member]
Indefinite-lived Intangible Assets [Line Items]
Asset Impairment Charges			0
Indefinite-lived Intangible Assets Acquired			$18,000,000		$39,000,000

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Changes in the carrying amount of goodwill) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Acquired During Period	$337
Goodwill [Roll Forward]
Goodwill, Beginning Balance	537
Foreign currency translation effect	-3
Goodwill, Ending Balance	$871

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Carrying value of intangible assets) (Details) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Jun. 27, 2014
Intangible assets acquired
Gross Carrying Amount	$714	$532
Accumulated Amortization	-322	-212
Net Carrying Amount	392	320
Weighted Average Remaining Useful Life (in years)	3 years 1 month 6 days	3 years 2 months 12 days
Existing technology [Member]
Intangible assets acquired
Gross Carrying Amount	173	68
Accumulated Amortization	-55	-18
Net Carrying Amount	118	50
Weighted Average Remaining Useful Life (in years)	3 years 7 months 6 days	2 years 10 months 24 days
Customer relationships [Member]
Intangible assets acquired
Gross Carrying Amount	486	450
Accumulated Amortization	-259	-192
Net Carrying Amount	227	258
Weighted Average Remaining Useful Life (in years)	2 years 7 months 6 days	3 years 3 months 18 days
Trade name [Member]
Intangible assets acquired
Gross Carrying Amount	27	10
Accumulated Amortization	-5	-1
Net Carrying Amount	22	9
Weighted Average Remaining Useful Life (in years)	3 years 4 months 24 days	3 years 1 month 6 days
Other Intangible Assets [Member]
Intangible assets acquired
Accumulated Amortization	-3	-1
Net Carrying Amount	25	3
Weighted Average Remaining Useful Life (in years)	4 years 4 months 24 days	4 years 4 months 24 days
Finite-lived Intangible Assets Acquired	$28	$4

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets (Expected amortization expense for acquisition-related intangible assets) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2015	$40
2016	139
2017	120
2018	60
2019	22
Thereafter	11
Total	$392	$320

Derivative_Financial_Instrumen2

Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014	Jun. 27, 2014	Jun. 28, 2013
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$4	$0	$4	$0	$1	$0
Total Return Swap [Member]
Derivative Financial Instruments
Notional value of total return swap	98		98
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Derivative Financial Instruments
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$1	$0	$0.70	$0

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Schedule of notional value of outstanding foreign currency forward exchange contracts) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2016	Apr. 03, 2015	Jun. 27, 2014
Foreign currency forward exchange contracts [Member] | Derivatives designated as hedging instruments [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		$111	$34
Foreign currency forward exchange contracts [Member] | Derivatives designated as hedging instruments [Member] | Thai Baht [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		0	0
Foreign currency forward exchange contracts [Member] | Derivatives designated as hedging instruments [Member] | Singapore dollars [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		80
Foreign currency forward exchange contracts [Member] | Derivatives designated as hedging instruments [Member] | Chinese Renminbi [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		31
Foreign currency forward exchange contracts [Member] | Derivatives designated as hedging instruments [Member] | British Pound Sterling
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts			25
Foreign currency forward exchange contracts [Member] | Derivatives designated as hedging instruments [Member] | Malaysia, Ringgits
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts			9
Foreign currency forward exchange contracts [Member] | Derivatives designated as hedging instruments [Member] | Euro Member Countries, Euro
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		0
Foreign currency forward exchange contracts [Member] | Derivatives not designated as hedging instruments [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		104	143
Foreign currency forward exchange contracts [Member] | Derivatives not designated as hedging instruments [Member] | Thai Baht [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		36	143
Foreign currency forward exchange contracts [Member] | Derivatives not designated as hedging instruments [Member] | Singapore dollars [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		41
Foreign currency forward exchange contracts [Member] | Derivatives not designated as hedging instruments [Member] | Chinese Renminbi [Member]
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		16
Foreign currency forward exchange contracts [Member] | Derivatives not designated as hedging instruments [Member] | British Pound Sterling
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts			0
Foreign currency forward exchange contracts [Member] | Derivatives not designated as hedging instruments [Member] | Malaysia, Ringgits
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts			0
Foreign currency forward exchange contracts [Member] | Derivatives not designated as hedging instruments [Member] | Euro Member Countries, Euro
Derivative Financial Instruments
Notional value of outstanding foreign currency forward exchange contracts		11
Subsequent Event [Member]
Derivative Financial Instruments
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$5

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Schedule of gross fair value of derivative instruments) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Fair Values of Derivative Instruments
Asset Derivatives, Other current assets	$0	$5
Liability derivatives, Accrued expenses	-8	0
Derivatives designated as hedging instruments [Member] | Foreign currency forward exchange contracts [Member]
Fair Values of Derivative Instruments
Asset Derivatives, Other current assets	0	3
Liability derivatives, Accrued expenses	-5	0
Derivatives not designated as hedging instruments [Member] | Foreign currency forward exchange contracts [Member]
Fair Values of Derivative Instruments
Asset Derivatives, Other current assets	0	2
Liability derivatives, Accrued expenses	-3	0
Derivatives not designated as hedging instruments [Member] | Total Return Swap [Member]
Fair Values of Derivative Instruments
Asset Derivatives, Other current assets	0
Liability derivatives, Accrued expenses	0	0
Derivative Liability, Fair Value, Gross Asset		$0

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Schedule of the effect of derivative instruments on Other comprehensive income (loss) and the Consolidated Statement of Operations) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Foreign currency forward exchange contracts [Member]
Derivatives Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized in Income on Derivative	$1	$1	($4)	($4)
Total Return Swap [Member]
Derivatives Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized in Income on Derivative	2		0
Cash Flow Hedges [Member] | Foreign currency forward exchange contracts [Member]
Derivatives Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)	-3	1	-13	0
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	-7	0	-9	0
Amount of Gain or (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) (a)	1	0	0.7	0
Gain or (loss) recognized in income, ineffective portion of hedging relationship			$0	$0

Fair_Value_Narrative_Details

Fair Value (Narrative) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation
Cost Method Investments	$105	$46

Fair_Value_Schedule_of_Fair_Va

Fair Value (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Assets and liabilities measured at fair value on a recurring basis
Restricted cash and investments	$4	$4
Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Restricted cash and investments	4	4
Recurring basis [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	2,192	2,329
Restricted cash and investments	4	4
Other assets, net		5
Total Assets	2,196	2,338
Derivative liabilities	-8	0
Total Liabilities	8	0
Recurring basis [Member] | Money market funds [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	705	793
Recurring basis [Member] | Commercial paper [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments		1,261
Recurring basis [Member] | Certificates of deposit [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	1,481	269
Restricted cash and investments	4
Recurring basis [Member] | Corporate bonds [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	6	6
Recurring basis [Member] | Other debt securities [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Restricted cash and investments		4
Recurring basis [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		5
Recurring basis [Member] | Derivative Financial Instruments, Liabilities [Member] | Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative liabilities	-8	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	705	793
Restricted cash and investments	0	0
Other assets, net		0
Total Assets	705	793
Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Money market funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	705	793
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Commercial paper [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments		0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Certificates of deposit [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Corporate bonds [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Other debt securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Restricted cash and investments		0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Derivative Financial Instruments, Assets [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		0
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative liabilities	0	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	1,487	1,536
Restricted cash and investments	4	4
Other assets, net		5
Total Assets	1,491	1,545
Derivative liabilities	-8	0
Total Liabilities	8	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial paper [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments		1,261
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Certificates of deposit [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	1,481	269
Restricted cash and investments	4
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate bonds [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	6	6
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other debt securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Restricted cash and investments		4
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative Financial Instruments, Assets [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		5
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative liabilities	-8	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0	0
Other assets, net		0
Total Assets	0	0
Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Money market funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial paper [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments		0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of deposit [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	0	0
Restricted cash and investments	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate bonds [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents and short-term investments	0	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other debt securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Restricted cash and investments		0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Derivative Financial Instruments, Assets [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative assets		0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Derivative liabilities	$0	$0

Fair_Value_Schedule_of_Fair_Va1

Fair Value (Schedule of Fair Value, by Balance Sheet Grouping, Measured on Recurring Basis) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Assets and liabilities measured at fair value on a recurring basis
Short-term investments	$6	$20
Restricted cash and investments	4	4
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Instruments (Level 1) [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash and cash equivalents	705	793
Short-term investments	0	0
Restricted cash and investments	0	0
Other assets, net		0
Total Assets	705	793
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash and cash equivalents	1,481	1,516
Short-term investments	6	20
Restricted cash and investments	4	4
Other assets, net		5
Total Assets	1,491	1,545
Accrued expenses - Derivative liabilities	8	0
Total Liabilities	8	0
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash and cash equivalents	0	0
Short-term investments	0	0
Restricted cash and investments	0	0
Other assets, net		0
Total Assets	0	0
Accrued expenses - Derivative liabilities	0	0
Total Liabilities	0	0
Fair Value, Total Balance [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash and cash equivalents	2,186	2,309
Short-term investments	6	20
Restricted cash and investments	4	4
Fair Value, Total Balance [Member] | Recurring basis [Member]
Assets and liabilities measured at fair value on a recurring basis
Cash and cash equivalents	2,186	2,309
Short-term investments	6	20
Restricted cash and investments	4	4
Other assets, net		5
Total Assets	2,196	2,338
Accrued expenses - Derivative liabilities	8	0
Total Liabilities	$8	$0

Fair_Value_Schedule_of_Carryin

Fair Value (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) (USD $)	Apr. 03, 2015	Jun. 27, 2014
In Millions, unless otherwise specified
Carrying Amount [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	$3,931	$3,920
Carrying Amount [Member] | Senior Notes 6.8 Percent due October 2016 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	0	335
Carrying Amount [Member] | Senior Notes 3.75 Percent due November 2018 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	800	800
Carrying Amount [Member] | Senior Notes 6.875 Percent due May 2020 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	474	534
Carrying Amount [Member] | Senior Notes 7.00 Percent Due November 2021 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	159	251
Carrying Amount [Member] | Senior Notes 4.75 Percent Due June 2023 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	1,000	1,000
Carrying Amount [Member] | Senior Notes 4.75 Percent Due January 2025 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	1,000	1,000
Carrying Amount [Member] | Senior note 5.75 percent due December 2034 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	498	0
Fair Value, Total Balance [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	4,130	4,060
Fair Value, Total Balance [Member] | Senior Notes 6.8 Percent due October 2016 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	0	374
Fair Value, Total Balance [Member] | Senior Notes 3.75 Percent due November 2018 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	832	820
Fair Value, Total Balance [Member] | Senior Notes 6.875 Percent due May 2020 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	492	578
Fair Value, Total Balance [Member] | Senior Notes 7.00 Percent Due November 2021 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	172	284
Fair Value, Total Balance [Member] | Senior Notes 4.75 Percent Due June 2023 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	1,052	1,009
Fair Value, Total Balance [Member] | Senior Notes 4.75 Percent Due January 2025 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	1,040	995
Fair Value, Total Balance [Member] | Senior note 5.75 percent due December 2034 [Member]
Debt Fair Value Disclosures
Current and noncurrent debt including short-term borrowings	$542	$0

Shareholders_Equity_Narrative_

Shareholders' Equity (Narrative) (Details) (USD $)	3 Months Ended			9 Months Ended
	Apr. 03, 2015	Jan. 02, 2015	Oct. 03, 2014	Apr. 03, 2015	Jul. 24, 2013	Apr. 22, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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	318,076,549			318,076,549
Preferred shares, authorized	100,000,000			100,000,000
Preferred shares, par value (in dollars per share)	$0.00			$0.00
Preferred Stock Minimum Number of Series	1			1
Stock Repurchase Program, Remaining Authorized Repurchase Amount	600,000,000			600,000,000
Stock Repurchased and Retired During Period, Shares	12,000,000	300,000	3,000,000	15,000,000
July2013ShareRepurchaseProgram [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount					2,500,000,000
Subsequent Event [Member] | April 2015 Share Repurchase [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount						$2,500,000,000

Shareholders_Equity_Schedule_o

Shareholders' Equity (Schedule of Share Repurchases) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Jan. 02, 2015	Oct. 03, 2014	Apr. 03, 2015
Equity [Abstract]
Stock Repurchased and Retired During Period, Shares	12	0.3	3	15
Stock Repurchased and Retired During Period, Value	$706	$18	$183	$907

Compensation_Narrative_Details

Compensation (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation	$33	$30	$106	$87

Guarantees_Guarantees_Narrativ

Guarantees Guarantees (Narrative) (Details) (USD $)	9 Months Ended
	Apr. 03, 2015
Guarantees [Abstract]
Indemnifications obligations to Officers and Directors	0
intellectual property indemnification obligations	0
Minimum [Member]
Schedule of Fiscal Years [Line Items]
Product Warranty Period Term, Minimum	1 year
Maximum [Member]
Schedule of Fiscal Years [Line Items]
Product Warranty Period Term, Minimum	5 years

Guarantees_Product_Warranty_De

Guarantees (Product Warranty) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Guarantees [Abstract]
Balance, beginning of period	$282	$300	$273	$320
Warranties issued	36	43	116	139
Repairs and replacements	-45	-55	-145	-174
Changes in liability for pre-existing warranties, including expirations	0	-2	21	1
Warranty liability assumed from business acquisitions	0	0	8	0
Balance, end of period	$273	$286	$273	$286

Earnings_Per_Share_Schedule_of

Earnings Per Share (Schedule of computation of basic and diluted net income (loss) per share) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Numerator:
Net income attributable to Seagate Technology plc	$291	$395	$1,605	$1,250
Number of shares used in per share calculations:
Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc	323	327	326	340
Weighted-average effect of dilutive securities:
Employee equity award plans	7	11	8	11
Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc	330	338	334	351
Net income per share attributable to Seagate Technology plc ordinary shareholders:
Basic net income per share (in dollars per share)	$0.90	$1.21	$4.92	$3.68
Diluted net income per share (in dollars per share)	$0.88	$1.17	$4.81	$3.56

Legal_Environmental_and_Other_1

Legal, Environmental and Other Contingencies (Narrative) (Details) (USD $)	3 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Apr. 03, 2015	Oct. 14, 2014	Jan. 23, 2012
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
Western Digital Corp [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount			525
Litigation Settlement, Amount, Including Interest			630
Litigation Settlement, Amount, Award Interest			10.00%
Litigation Settlement, Amount, Partial Payment		$773