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Earnings per Common Share Other (Details)
Mar. 31, 2014
Mar. 03, 2009
Walmart [Member]
Common Class A [Member]
Mar. 31, 2014
Walmart [Member]
Employee Stock Option [Member]
Common Class A [Member]
Diluted earnings per common share [Line Items]      
Unvested Walmart Shares   3,426,765 478,482
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 4,283,456