2.3.0.11 Html 20 68 1 false 2 0 false 3 true false R1.htm 000990 - Document - Document And Entity Information Sheet http://aeifunds.com/role/DocumentAndEntityInformation Document And Entity Information false false R2.htm 001000 - Statement - Balance Sheet Sheet http://aeifunds.com/role/BalanceSheet Balance Sheet false false R3.htm 001010 - Statement - Balance Sheet Parenthetical Sheet http://aeifunds.com/role/BalanceSheetParenthetical Balance Sheet Parenthetical false false R4.htm 002000 - Statement - Statement of Income Sheet http://aeifunds.com/role/StatementOfIncome Statement of Income false false R5.htm 003000 - Statement - Statement of Cash Flows Sheet http://aeifunds.com/role/StatementOfCashFlows Statement of Cash Flows false false R6.htm 004000 - Statement - Statement of Changes in Partners' Capital Sheet http://aeifunds.com/role/StatementOfChangesInPartnersCapital Statement of Changes in Partners' Capital false false R7.htm 006010 - Disclosure - Basis of Accounting Sheet http://aeifunds.com/role/BasisOfAccounting Basis of Accounting false false R8.htm 006020 - Disclosure - Organization Sheet http://aeifunds.com/role/Organization Organization false false R9.htm 006030 - Disclosure - Reclassification Sheet http://aeifunds.com/role/Reclassification Reclassification false false R10.htm 006040 - Disclosure - Investments in Real Estate Sheet http://aeifunds.com/role/InvestmentsInRealEstate Investments in Real Estate false false R11.htm 006050 - Disclosure - Payable to AEI Fund Management, Inc. Sheet http://aeifunds.com/role/PayableToAeiFundManagementInc Payable to AEI Fund Management, Inc. false false R12.htm 006060 - Disclosure - Discontinued Operations Sheet http://aeifunds.com/role/DiscontinuedOperations Discontinued Operations false false R13.htm 006070 - Disclosure - Fair Value Measurements Sheet http://aeifunds.com/role/FairValueMeasurements Fair Value Measurements false false All Reports Book All Reports Element us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding had a mix of decimals attribute values: 2 0. Element us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding had a mix of decimals attribute values: 2 0. Element us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding had a mix of decimals attribute values: 2 0. Process Flow-Through: 001000 - Statement - Balance Sheet Process Flow-Through: Removing column 'Jun. 30, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 001010 - Statement - Balance Sheet Parenthetical Process Flow-Through: 002000 - Statement - Statement of Income Process Flow-Through: 003000 - Statement - Statement of Cash Flows aei21-20110630.xml aeixx-20110630.xsd aeixx-20110630_cal.xml aeixx-20110630_def.xml aeixx-20110630_lab.xml aeixx-20110630_pre.xml true true