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Debt of the Operating Partnership - Narrative (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
2.500% notes due 2026 | Digital Euro Finco, LLC        
Debt Instrument        
Stated interest rate 2.50%   2.50% 2.50%
3.600% notes due 2029 | Digital Realty Trust, L.P.        
Debt Instrument        
Stated interest rate 3.60%   3.60% 3.60%
Unsecured senior notes | Digital Realty Trust, L.P.        
Debt Instrument        
Secured debt leverage ratio, maximum 40.00% 40.00%    
Unsecured senior notes | Digital Realty Trust, L.P. | Maximum        
Debt Instrument        
Leverage ratio 60.00% 60.00%    
Unsecured senior notes | Digital Realty Trust, L.P. | Minimum        
Debt Instrument        
Interest coverage ratio 1.50 1.50    
Total unencumbered assets 150.00% 150.00%    
Unsecured senior notes | 2.500% notes due 2026 | Digital Realty Trust, L.P.        
Debt Instrument        
Stated interest rate 2.50%   2.50%  
Unsecured senior notes | 2.500% notes due 2026 | Digital Euro Finco, LLC        
Debt Instrument        
Stated interest rate 2.50%   2.50%  
Aggregate principal amount | € € 1,075.0      
Net proceeds from offering | € € 1,218.6      
Unsecured senior notes | 3.600% notes due 2029 | Digital Realty Trust, L.P.        
Debt Instrument        
Stated interest rate 3.60%   3.60%  
Aggregate principal amount | $     $ 900.0  
Net proceeds from offering | $   $ 890.6