Income per Share (Summary Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to common stockholders	$ 101,728	$ 34,186
Weighted average shares/units outstanding-basic (shares)	135,704,525	128,535,995
Weighted average shares/units outstanding-diluted (shares)	136,128,800	129,136,961
Basic ($ per share/unit)	$ 0.75	$ 0.27
Diluted ($ per share/unit)	$ 0.75	$ 0.26
Digital Realty Trust, L.P.
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to common stockholders	$ 103,754	$ 34,879
Weighted average shares/units outstanding-basic (shares)	138,406,993	131,142,664
Stock options (shares)	33,839	51,909
Unvested incentive units	147,874	160,717
Series H Cumulative Redeemable Preferred Units (shares)	0	388,340
2014 market performance-based awards (shares)	242,562	0
Weighted average shares/units outstanding-diluted (shares)	138,831,268	131,743,630
Basic ($ per share/unit)	$ 0.75	$ 0.27
Diluted ($ per share/unit)	$ 0.75	$ 0.26