Equity And Accumulated Other Comprehensive Loss, Net (7.375% Series H Cumulative Convertible Preferred Stock Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended		6 Months Ended
	Mar. 26, 2014	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014	Apr. 07, 2014
Class of Stock [Line Items]
Shares issued upon conversion		0.9632
Series H Preferred Stock and Unit
Class of Stock [Line Items]
Preferred Stock, shares issued	12,000,000	14,600,000	0		2,000,000
Preferred stock, dividend rate	7.375%	7.375%	7.375%
Gross proceeds from issuance of redeemable preferred stock	$ 289.3	$ 353.3
Annual rate of dividend per share		$ 1.84375
Preferred Stock, liquidation preference per share/unit		$ 25	$ 25
Over Allotment Option | Series H Preferred Stock and Unit
Class of Stock [Line Items]
Preferred Stock, shares issued					600,000
Digital Realty Trust, L.P. | Series H Preferred Stock and Unit
Class of Stock [Line Items]
Preferred stock, dividend rate		7.375%	7.375%
Preferred Stock, liquidation preference per share/unit		$ 25	$ 25
Preferred Stock, Dividends Per Share, Declared				$ 0.48655
Preferred Stock, Redemption Price Per Share		$ 25.00