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Subsequent Events (Details) (USD $)
In Billions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Jan. 28, 2015
Proceeds from sale of Property [Member]    
Subsequent Event [Line Items]    
Sales Price   $ 1.12dre_SalesPrice
/ us-gaap_SubsequentEventTypeAxis
= dre_ProceedsfromsaleofPropertyMember
Declaration of Dividends [Member] | Common Stock [Member]    
Subsequent Event [Line Items]    
Common Stock, Dividends, Per Share, Declared $ 0.17us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_DividendDeclaredMember		  
Dividends Payable, Date of Record Feb. 17, 2015  
Dividends Payable, Date to be Paid Feb. 27, 2015