Capital and Accumulated Other Comprehensive Income (Loss) (7.375% Series H Cumulative Redeemable Preferred Units Narrative) (Details) - Series H Preferred Stock and Unit - $ / shares			6 Months Ended	12 Months Ended
	Jun. 30, 2014	Mar. 26, 2014	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Preferred stock, dividend rate		7.375%		7.375%	7.375%
Annual rate of dividend per share (in dollars per share)				$ 1.84375
Preferred stock, liquidation preference per share/unit				$ 25	$ 25
Preferred stock dividends per share declared (in dollars per share)			$ 0.48655
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Preferred units, issued (in shares)				14,600,000	14,600,000
Preferred stock, dividend rate				7.375%	7.375%
Annual rate of dividend per share (in dollars per share)				$ 1.84375
Preferred stock, liquidation preference per share/unit				$ 25	$ 25
Preferred stock dividends per share declared (in dollars per share)	$ 0.48655