v2.4.1.9

Equity Plans - Stock-based compensation expense (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 05, 2015 | Feb. 27, 2014 | Mar. 05, 2015 | Feb. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | $ 49us-gaap_ShareBasedCompensation | $ 27us-gaap_ShareBasedCompensation | $ 84us-gaap_ShareBasedCompensation | $ 49us-gaap_ShareBasedCompensation
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract] |  |  |  |
Total unrecognized compensation costs, net of estimated forfeitures, related to non-vested awards expected to be recognized | 468us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  | 468us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |
Weighted average period that unrecognized compensation costs is expected to be recognized (in years) |  |  | 1 year 6 months |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | 23us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 14us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 41us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 28us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | 26us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = mu_RestrictedStockAwardsMember | 13us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = mu_RestrictedStockAwardsMember | 43us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = mu_RestrictedStockAwardsMember | 21us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = mu_RestrictedStockAwardsMember
Cost of Goods Sold [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | 19us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 8us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 31us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 15us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | 18us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 13us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 33us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember | 24us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Research and Development [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | $ 12us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 6us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 20us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | $ 10us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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