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Equity Method Investments (Details)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Mar. 05, 2015
USD ($)
Feb. 27, 2014
USD ($)
Mar. 05, 2015
USD ($)
Feb. 27, 2014
USD ($)
Aug. 28, 2014
USD ($)
Mar. 05, 2015
Inotera [Member]
USD ($)
Feb. 27, 2014
Inotera [Member]
USD ($)
Mar. 05, 2015
Inotera [Member]
USD ($)
Feb. 27, 2014
Inotera [Member]
USD ($)
Mar. 05, 2015
Inotera [Member]
TWD
Aug. 28, 2014
Inotera [Member]
USD ($)
Mar. 05, 2015
Inotera [Member]
Inventories [Member]
DRAM [Member]
USD ($)
Feb. 27, 2014
Inotera [Member]
Inventories [Member]
DRAM [Member]
USD ($)
Mar. 05, 2015
Inotera [Member]
Inventories [Member]
DRAM [Member]
USD ($)
Feb. 27, 2014
Inotera [Member]
Inventories [Member]
DRAM [Member]
USD ($)
Mar. 05, 2015
Inotera [Member]
Nanya [Member]
Mar. 05, 2015
Inotera [Member]
Income Tax Expense (Benefit), Adjustment of Deferred Tax (Asset) Liability [Member]
USD ($)
Mar. 05, 2015
Inotera [Member]
Variable interest entity, not primary beneficiary [Member]
USD ($)
Mar. 05, 2015
Tera Probe [Member]
USD ($)
Dec. 04, 2014
Tera Probe [Member]
USD ($)
Feb. 27, 2014
Tera Probe [Member]
USD ($)
Mar. 05, 2015
Tera Probe [Member]
USD ($)
Feb. 27, 2014
Tera Probe [Member]
USD ($)
Mar. 05, 2015
Tera Probe [Member]
JPY (¥)
Aug. 28, 2014
Tera Probe [Member]
USD ($)
Aug. 29, 2013
Tera Probe [Member]
MMJ Acquisition [Member]
Mar. 05, 2015
Other [Member]
USD ($)
Feb. 27, 2014
Other [Member]
USD ($)
Mar. 05, 2015
Other [Member]
USD ($)
Feb. 27, 2014
Other [Member]
USD ($)
Aug. 28, 2014
Other [Member]
USD ($)
Schedule of Equity Method Investments [Line Items]                                                              
Investment Balance $ 1,239,000,000us-gaap_EquityMethodInvestments   $ 1,239,000,000us-gaap_EquityMethodInvestments   $ 971,000,000us-gaap_EquityMethodInvestments $ 1,190,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
[1]   $ 1,190,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
[1]     $ 914,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
[1]               $ 32,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
    $ 32,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
    $ 48,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
  $ 17,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_OtherEquityMethodInvetmentsMember
  $ 17,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_OtherEquityMethodInvetmentsMember
  $ 9,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_OtherEquityMethodInvetmentsMember
Ownership Percentage (in hundredths)           33.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
[1]   33.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
[1]     33.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
[1]               40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
    40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
    40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
           
Variable Interest Entity Entity Maximum Loss Exposure Amount From Investment Balance                                   1,190,000,000mu_VariableInterestEntityEntityMaximumLossExposureAmountFromInvestmentBalance
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
                         
Equity in net income of equity method investees, net of tax 208,000,000us-gaap_IncomeLossFromEquityMethodInvestments 134,000,000us-gaap_IncomeLossFromEquityMethodInvestments 332,000,000us-gaap_IncomeLossFromEquityMethodInvestments 220,000,000us-gaap_IncomeLossFromEquityMethodInvestments   206,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
131,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
335,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
215,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
              65,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ mu_IncomeTaxesAxis
= mu_IncomeTaxExpenseBenefitAdjustmentofDeferredTaxAssetLiabilityMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
  1,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
  4,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
(6,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
6,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
      1,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_OtherEquityMethodInvetmentsMember
(1,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_OtherEquityMethodInvetmentsMember
3,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_OtherEquityMethodInvetmentsMember
(1,000,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_OtherEquityMethodInvetmentsMember
 
Percentage interest held by a third party (in hundredths)                               33.00%mu_EquityMethodInvestmentOwnershipPercentageHeldByThirdParty
/ mu_EntityWhichWePartnerWithInInvestmentAxis
= mu_NanyaMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
                             
Market value of equity interests           3,090,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
  3,090,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
                    33,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
    33,000,000us-gaap_EquityMethodInvestmentQuotedMarketValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
                 
Equity Method Investment, Quoted Market Price Per Share                   45.25mu_EquityMethodInvestmentQuotedMarketPricePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
                          ¥ 1,076mu_EquityMethodInvestmentQuotedMarketPricePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
             
Amount in accumulated other comprehensive income (loss) for cumulative translation adjustments on its investment           (19,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
  (19,000,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
    44,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
                                       
Purchases of DRAM products from Inotera                       628,000,000us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_ProductOrServiceAxis
= mu_DramMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember
714,000,000us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_ProductOrServiceAxis
= mu_DramMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember
1,360,000,000us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_ProductOrServiceAxis
= mu_DramMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember
1,300,000,000us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases
/ us-gaap_ProductOrServiceAxis
= mu_DramMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_InoteraMember
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_InventoriesMember
                               
Cumulative Percentage Ownership after All Transactions                                                   40.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_BusinessAcquisitionAxis
= mu_MMJAcquisitionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
         
Tera Probe other-than-temporary Impairment                                       10,000,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
                     
Difference between cost of Tera Probe investment and underlying equity                                     $ 31,000,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
    $ 31,000,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mu_TeraProbeMember
                 
Weighted-average period for remaining Tera Probe amortization (in years)                                           7 years                  
[1] (1) Entity is a variable interest entity.