2.2.0.25falsefalse00410 - Statement - Comprehensive Income (Parenthetical) (Audited)truefalseIn Millionsfalse1falsefalseUSDfalsefalse2/1/2010 - 1/31/2011 USD ($) USD ($) / shares $Duration_2_1_2010_To_1_31_2011http://www.sec.gov/CIK0000104169duration2010-02-01T00:00:002011-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse2/1/2009 - 1/31/2010 USD ($) USD ($) / shares $Duration_2_1_2009_To_1_31_2010http://www.sec.gov/CIK0000104169duration2009-02-01T00:00:002010-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse3false0wmt_NetIncomeLossAttributableToRedeemableNonControllingInterestswmtfalsecreditdurationNet income (loss) attributable to redeemable non-controlling interestsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse2000000020falsetruefalsefalsefalse2truefalsefalse1400000014[1]falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNet income (loss) attributable to redeemable non-controlling interestsNo authoritative reference available.falsefalse4false0wmt_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToRedeemableNoncontrollingInterestwmtfalsedebitdurationOther Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse9700000097falsetruefalsefalsefalse2truefalsefalse4600000046[1]falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryOther Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Redeemable Noncontrolling InterestNo authoritative reference available.falsefalse1As Adjusted23Comprehensive Income (Parenthetical) (Audited) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue