2.2.0.25truefalse40103 - Disclosure - Note 1. Summary of Significant Accounting Policies (Goodwill by Operating Segment) (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$3falsefalseUSDtruefalse{us-gaap_GoodwillBySegmentAxis} : Walmart U.S. [Member]
2/1/2010 - 1/31/2011
USD ($)
$Duration_2_1_2010_To_1_31_2011247http://www.sec.gov/CIK0000104169duration2010-02-01T00:00:002011-01-31T00:00:00falsefalseWalmart U.S. [Member]us-gaap_GoodwillBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldiwmt_WalmartUSMemberus-gaap_GoodwillBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_GoodwillBySegmentAxis} : Walmart U.S. [Member]
1/31/2009
USD ($)
$As_Of_1_31_200913http://www.sec.gov/CIK0000104169instant2009-01-31T00:00:000001-01-01T00:00:00falsefalseWalmart U.S. [Member]us-gaap_GoodwillBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldiwmt_WalmartUSMemberus-gaap_GoodwillBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{us-gaap_GoodwillBySegmentAxis} : Walmart International [Member]
2/1/2010 - 1/31/2011
USD ($)
$Duration_2_1_2010_To_1_31_20112222http://www.sec.gov/CIK0000104169duration2010-02-01T00:00:002011-01-31T00:00:00falsefalseWalmart International [Member]us-gaap_GoodwillBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldiwmt_WalmartInternationalMemberus-gaap_GoodwillBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_GoodwillBySegmentAxis} : Walmart International [Member]
2/1/2009 - 1/31/2010
USD ($)
$Duration_2_1_2009_To_1_31_2010322http://www.sec.gov/CIK0000104169duration2009-02-01T00:00:002010-01-31T00:00:00falsefalseWalmart International [Member]us-gaap_GoodwillBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldiwmt_WalmartInternationalMemberus-gaap_GoodwillBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7falsefalseUSDtruefalse{us-gaap_GoodwillBySegmentAxis} : Sam's Club [Member]
1/31/2011
USD ($)
$As_Of_1_31_201114http://www.sec.gov/CIK0000104169instant2011-01-31T00:00:000001-01-01T00:00:00falsefalseSam's Club [Member]us-gaap_GoodwillBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldiwmt_SamsClubMemberus-gaap_GoodwillBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8falsefalseUSDtruefalse{us-gaap_GoodwillBySegmentAxis} : Sam's Club [Member]
1/31/2010
USD ($)
$As_Of_1_31_201018http://www.sec.gov/CIK0000104169instant2010-01-31T00:00:000001-01-01T00:00:00falsefalseSam's Club [Member]us-gaap_GoodwillBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldiwmt_SamsClubMemberus-gaap_GoodwillBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9falsefalseUSDtruefalse{us-gaap_GoodwillBySegmentAxis} : Sam's Club [Member]
1/31/2009
USD ($)
$As_Of_1_31_200911http://www.sec.gov/CIK0000104169instant2009-01-31T00:00:000001-01-01T00:00:00falsefalseSam's Club [Member]us-gaap_GoodwillBySegmentAxisxbrldihttp://xbrl.org/2006/xbrldiwmt_SamsClubMemberus-gaap_GoodwillBySegmentAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0us-gaap_Goodwillus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse1612600000016126[1]falsetruefalsefalsefalse2truefalsefalse1526000000015260falsetruefalsefalsefalse3truefalsefalse207000000207falsetruefalsetruefalse4truefalsefalse207000000207falsetruefalsetruefalse5truefalsefalse1560600000015606falsetruefalsetruefalse6truefalsefalse1474000000014740falsetruefalsetruefalse7truefalsefalse313000000313falsetruefalsetruefalse8truefalsefalse313000000313falsetruefalsetruefalse9truefalsefalse313000000313falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
falsefalse3false0us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustmentsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse605000000605falsefalsefalsefalsefalse2truefalsefalse866000000866falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse605000000605falsefalsefalsetruefalse6truefalsefalse866000000866falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryReflects net changes to the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
falsefalse4false0us-gaap_GoodwillAcquiredDuringPeriodus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse3200000032falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse3200000032falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e(1)
falsefalse5false0us-gaap_Goodwillus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse1676300000016763falsetruefalsefalsefalse2truefalsefalse1612600000016126[1]falsetruefalsefalsefalse3truefalsefalse239000000239falsetruefalsetruefalse4truefalsefalse207000000207falsetruefalsetruefalse5truefalsefalse1621100000016211falsetruefalsetruefalse6truefalsefalse1560600000015606falsetruefalsetruefalse7truefalsefalse313000000313falsetruefalsetruefalse8truefalsefalse313000000313falsetruefalsetruefalse9truefalsefalse313000000313falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryCarrying amount as of the balance sheet date, which is the cumulative amount paid, adjusted for any amortization recognized prior to adoption of FAS 142 and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
falsefalse1As Adjusted94Note 1. Summary of Significant Accounting Policies (Goodwill by Operating Segment) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
