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Debt of the Operating Partnership (Unsecured Term Loan) (Narrative) (Details) - USD ($)
9 Months Ended
Jan. 15, 2016
Sep. 30, 2016
Apr. 16, 2012
Digital Realty Trust, L.P.      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 6,086,467,000  
Unsecured term loan — 5-year      
Debt Instrument [Line Items]      
Debt instrument, term 5 years    
Unsecured term loan — 5-year | Digital Realty Trust, L.P.      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity $ 1,250,000,000.00    
Debt instrument, term 5 years    
Interest rate basis spread   1.10%  
Unsecured term loan — 7-year | Digital Realty Trust, L.P.      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity $ 300,000,000    
Debt instrument, term 7 years    
Interest rate basis spread   1.55%  
Unsecured term loan | Digital Realty Trust, L.P.      
Debt Instrument [Line Items]      
Credit facility, maximum borrowing capacity   $ 1,550,000,000.00 $ 1,000,000,000.0
Credit facility, maximum borrowing capacity, subject to receipt of lender commitments and other conditions   1,800,000,000.0  
Capitalized financing costs   $ 7,400,000