Capital And Accumulated Other Comprehensive Loss (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended	12 Months Ended
	Apr. 09, 2013	Sep. 30, 2013	Dec. 31, 2012
Digital Realty Trust, L.P. [Member]
Capital and Accumulated Other Comprehensive Income (Loss) [Line Items]
Redemption value of common units		$ 134.9	$ 161.5
Series G Cumulative Convertible Preferred Units [Member] [Member]
Capital and Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred stock, issued	10,000,000	10,000,000	0
Preferred stock, dividend rate	5.875%	5.875%	5.875%
Preferred stock dividend per share amount	$ 1.46875	$ 1.469
Preferred stock, liquidation preference per share/unit	$ 25.00	$ 25	$ 25
Dividend and distribution amount	$ 0.334550
Shares issued upon conversion		0.7532
Redemption price		$ 25.00
Series G Cumulative Convertible Preferred Units [Member] [Member] | Digital Realty Trust, L.P. [Member]
Capital and Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred stock, issued	10,000,000	10,000,000	0
Preferred stock, dividend rate	5.875%	5.875%	5.875%
Preferred stock dividend per share amount	$ 1.46875	$ 1.469
Preferred stock, liquidation preference per share/unit	$ 25.00	$ 25	$ 25
Dividend and distribution amount		$ 0.334550