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USD ($)
USD ($) / shares
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USD ($)
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USD ($)
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falsefalse13false0us-gaap_IncreaseDecreaseInRetailRelatedInventoriesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-3086000000-3086falsefalsefalsefalsefalse2truefalsefalse22130000002213[2]falsefalsefalsefalsefalse3truefalsefalse-184000000-184[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the book value of merchandise inventory held by a retailer, wholesaler, or distributor for future sale; includes packaging and other supplies used to store, transport, or present merchandise inventory.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse14false0us-gaap_IncreaseDecreaseInAccountsPayableus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse25570000002557falsefalsefalsefalsefalse2truefalsefalse10520000001052[2]falsefalsefalsefalsefalse3truefalsefalse-410000000-410[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the aggregate amount of obligations due within one year (or one business cycle). This may include trade payables, amounts due to related parties, royalties payable, and other obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse15false0us-gaap_IncreaseDecreaseInAccruedLiabilitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-433000000-433falsefalsefalsefalsefalse2truefalsefalse13480000001348[2]falsefalsefalsefalsefalse3truefalsefalse20360000002036[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the aggregate amount of expenses incurred but not yet paid.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse16false0us-gaap_NetCashProvidedByUsedInOperatingActivitiesus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse2364300000023643falsefalsefalsefalsefalse2truefalsefalse2624900000026249[2]falsefalsefalsefalsefalse3truefalsefalse2314700000023147[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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truefalse17true0us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse18false0us-gaap_PaymentsToAcquirePropertyPlantAndEquipmentus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-12699000000-12699falsefalsefalsefalsefalse2truefalsefalse-12184000000-12184[2]falsefalsefalsefalsefalse3truefalsefalse-11499000000-11499[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse19false0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipmentus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse489000000489falsefalsefalsefalsefalse2truefalsefalse10020000001002[2]falsefalsefalsefalsefalse3truefalsefalse714000000714[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse20false0us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliatesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse838000000838[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) associated with the sale or (acquisition) of a business segment during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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falsefalse21false0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-202000000-202falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse-1576000000-1576[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse22false0us-gaap_PaymentsForProceedsFromOtherInvestingActivitiesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse219000000219falsefalsefalsefalsefalse2truefalsefalse-438000000-438[2]falsefalsefalsefalsefalse3truefalsefalse781000000781[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse23false0us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-12193000000-12193falsefalsefalsefalsefalse2truefalsefalse-11620000000-11620[2]falsefalsefalsefalsefalse3truefalsefalse-10742000000-10742[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from investing activity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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truefalse24true0us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse25false0us-gaap_ProceedsFromRepaymentsOfShortTermDebtus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse503000000503falsefalsefalsefalsefalse2truefalsefalse-1033000000-1033[2]falsefalsefalsefalsefalse3truefalsefalse-3745000000-3745[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse26false0us-gaap_ProceedsFromIssuanceOfLongTermDebtus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse1139600000011396falsefalsefalsefalsefalse2truefalsefalse55460000005546[2]falsefalsefalsefalsefalse3truefalsefalse65660000006566[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse27false0us-gaap_RepaymentsOfLongTermDebtus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-4080000000-4080falsefalsefalsefalsefalse2truefalsefalse-6033000000-6033[2]falsefalsefalsefalsefalse3truefalsefalse-5387000000-5387[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 95
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falsefalse28false0us-gaap_PaymentsOfDividendsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-4437000000-4437falsefalsefalsefalsefalse2truefalsefalse-4217000000-4217[2]falsefalsefalsefalsefalse3truefalsefalse-3746000000-3746[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from the entity's earnings to the shareholders.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse29false0us-gaap_PaymentsForRepurchaseOfCommonStockus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-14776000000-14776falsefalsefalsefalsefalse2truefalsefalse-7276000000-7276[2]falsefalsefalsefalsefalse3truefalsefalse-3521000000-3521[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow to reacquire common stock during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse31false0us-gaap_RepaymentsOfLongTermCapitalLeaseObligationsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-363000000-363falsefalsefalsefalsefalse2truefalsefalse-346000000-346[2]falsefalsefalsefalsefalse3truefalsefalse-352000000-352[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for the obligation for lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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falsefalse32false0us-gaap_ProceedsFromPaymentsForOtherFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse-271000000-271falsefalsefalsefalsefalse2truefalsefalse-396000000-396[2]falsefalsefalsefalsefalse3truefalsefalse267000000267[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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truefalse34false0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse6600000066falsefalsefalsefalsefalse2truefalsefalse194000000194[2]falsefalsefalsefalsefalse3truefalsefalse-781000000-781[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe effect of exchange rate changes on cash balances held in foreign currencies.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse35false0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-512000000-512falsefalsefalsefalsefalse2truefalsefalse632000000632[2]falsefalsefalsefalsefalse3truefalsefalse17060000001706[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change between the beginning and ending balance of cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 95
-Paragraph 26
truefalse36false0wmt_TotalCashCashEquivalentswmtfalsedebitinstantCash and cash equivalents include investments with a maturity of three months or less when purchased. The majority of...falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse79070000007907[2]falsefalsefalsefalsefalse2truefalsefalse72750000007275[2]falsefalsefalsefalsefalse3truefalsefalse55690000005569[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCash and cash equivalents include investments with a maturity of three months or less when purchased. The majority of payments due from banks for third party credit card, debit card and electronic benefit transactions (EBT) process within 24-48 hours, except for transactions occurring on a Friday, which are generally processed on the following Monday. All credit card, debit card, and EBT transactions that process in less than seven days are classified as cash and cash equivalents. In addition, cash and cash equivalents include restricted cash related to cash collateral holdings from various counterparties as required by certain derivative and trust agreements.No authoritative reference available.falsefalse37false0wmt_TotalCashCashEquivalentswmtfalsedebitinstantCash and cash equivalents include investments with a maturity of three months or less when purchased. The majority of...falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse73950000007395falsefalsefalsefalsefalse2truefalsefalse79070000007907[2]falsefalsefalsefalsefalse3truefalsefalse72750000007275[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCash and cash equivalents include investments with a maturity of three months or less when purchased. The majority of payments due from banks for third party credit card, debit card and electronic benefit transactions (EBT) process within 24-48 hours, except for transactions occurring on a Friday, which are generally processed on the following Monday. All credit card, debit card, and EBT transactions that process in less than seven days are classified as cash and cash equivalents. In addition, cash and cash equivalents include restricted cash related to cash collateral holdings from various counterparties as required by certain derivative and trust agreements.No authoritative reference available.falsefalse38true0us-gaap_SupplementalCashFlowInformationAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse39false0us-gaap_IncomeTaxesPaidus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse69840000006984falsefalsefalsefalsefalse2truefalsefalse73890000007389[2]falsefalsefalsefalsefalse3truefalsefalse65960000006596[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 29
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 27
-Subparagraph f
falsefalse40false0us-gaap_InterestPaidus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse21630000002163falsefalsefalsefalsefalse2truefalsefalse21410000002141[2]falsefalsefalsefalsefalse3truefalsefalse17870000001787[2]falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of cash paid during the current period for interest owed on money borrowed; includes amount of interest capitalizedReference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 29
falsefalse41false0us-gaap_CapitalLeaseObligationsIncurredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse4900000049falsetruefalsefalsefalse2truefalsefalse6100000061[2]falsetruefalsefalsefalse3truefalsefalse284000000284[2]falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe increase during the period in capital lease obligations due to entering into new capital leases.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32
falsefalse1Includes $20 million and $14 million in fiscal 2011 and 2010, respectively, that is related to the redeemable noncontrolling interest. 2As Adjusted339Consolidated Statements of Cash Flows (Audited) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
