2.2.0.25falsefalse41701 - Disclosure - Note 17. Subsequent Events (Narrative) (Details)truefalsefalse1falsefalseUSDfalsefalse3/3/2011 USD ($) / shares $As_Of_3_3_2011http://www.sec.gov/CIK0000104169instant2011-03-03T00:00:000001-01-01T00:00:00Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse1/31/2011 USD ($) USD ($) / shares $As_Of_1_31_2011http://www.sec.gov/CIK0000104169instant2011-01-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$3falsefalseUSDfalsefalse1/31/2010 USD ($) USD ($) / shares $As_Of_1_31_2010http://www.sec.gov/CIK0000104169instant2010-01-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0wmt_SubsequentEventsAbstractwmtfalsenadurationsubsequent events [abstract]falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringsubsequent events [abstract]falsefalse3false0us-gaap_DividendsPayableAmountPerShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1.461.46falsetruefalsefalsefalse2truefalsefalse1.211.21falsetruefalsefalsefalse3truefalsefalse1.091.09falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe per share amount of a dividend declared, but not paid, as of the financial reporting date.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 falsetrue4false0wmt_IncreaseInDividendwmtfalsenainstantIncrease in dividendfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.210.21falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureIncrease in dividendNo authoritative reference available.falsefalse33Note 17. Subsequent Events (Narrative) (Details) (USD $)UnKnownUnKnownNoRoundingUnKnowntruetrue