2.2.0.25falsefalse40409 - Disclosure - Note 4. Share-Based Compensation (Schedule of Additional Information Related to Stock Options) (Details)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$3falsefalseUSDfalsefalse2/1/2008 - 1/31/2009
USD ($)
USD ($) / shares
$Duration_2_1_2008_To_1_31_2009http://www.sec.gov/CIK0000104169duration2008-02-01T00:00:002009-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_ShareBasedCompensationAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse3false0wmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValuewmtfalsedebitinstantThe total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse5400000054falsetruefalsefalsefalse2truefalsefalse7900000079falsetruefalsefalsefalse3truefalsefalse107000000107falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.No authoritative reference available.falsefalse4false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValueus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse5100000051falsefalsefalsefalsefalse2truefalsefalse3900000039falsefalsefalsefalsefalse3truefalsefalse173000000173falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph c(2)
falsefalse5false0us-gaap_ProceedsFromStockOptionsExercisedus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse205000000205falsetruefalsefalsefalse2truefalsefalse111000000111falsetruefalsefalsefalse3truefalsefalse585000000585falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the amount received from holders exercising their stock options.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a
falsefalse34Note 4. Share-Based Compensation (Schedule of Additional Information Related to Stock Options) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
