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Equity Method Investment (Details) - Equity Method Investment (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Real Estate Contributed (at carrying value) $ 1,231,125us-gaap_ContributionOfProperty $ 0us-gaap_ContributionOfProperty
Cash Contributed 13,585us-gaap_PaymentsToAcquireEquityMethodInvestments 0us-gaap_PaymentsToAcquireEquityMethodInvestments
AEI Net Lease Portfolio II DST    
Schedule of Equity Method Investments [Line Items]    
Real Estate Contributed (at carrying value) 1,231,125us-gaap_ContributionOfProperty
/ invest_InvestmentHoldingAxis
= aei20_AEINetLeasePortfolioIIDSTMember
 
Cash Contributed 13,585us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei20_AEINetLeasePortfolioIIDSTMember
 
Net Income – Rental Activity 16,478us-gaap_IncomeLossFromEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei20_AEINetLeasePortfolioIIDSTMember
 
Net Income – Gain on Sale of Real Estate 147,755us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ invest_InvestmentHoldingAxis
= aei20_AEINetLeasePortfolioIIDSTMember
 
Distributions from Net Rental Income (16,478)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ invest_InvestmentHoldingAxis
= aei20_AEINetLeasePortfolioIIDSTMember
 
Proceeds from Sale of Class B Interests (525,322)us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei20_AEINetLeasePortfolioIIDSTMember
 
Equity Method Investments $ 867,143us-gaap_EquityMethodInvestmentAggregateCost
/ invest_InvestmentHoldingAxis
= aei20_AEINetLeasePortfolioIIDSTMember