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Equity Plans - Stock-based compensation expense (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
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