Quarterly Financial Information (Digital Realty Trust, Inc.) (Summary Of Selected Quarterly Financial Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Total operating revenues	$ 412,216	$ 412,186	$ 401,446	$ 390,590	$ 380,931	$ 379,456	$ 363,502	$ 358,370	$ 1,616,438	$ 1,482,259	$ 1,279,067
Net income (loss)	(34,794)	130,161	61,332	46,717	55,667	153,480	59,621	51,681	203,415	320,449	216,047
Net income (loss) attributable to Digital Realty Trust, Inc.	(33,833)	127,769	60,339	45,912	54,703	150,598	58,476	50,711	200,183	314,488	210,334
Preferred unit distributions	18,455	18,455	18,829	11,726	11,726	11,726	11,399	8,054	67,465	42,905	38,672
Net income (loss) available to common unitholders	$ (52,288)	$ 109,314	$ 41,510	$ 34,186	$ 42,977	$ 138,872	$ 47,077	$ 42,657	$ 132,718	$ 271,583	$ 171,662
Basic net income (loss) per unit available to common unitholders	$ (0.39)	$ 0.81	$ 0.31	$ 0.27	$ 0.33	$ 1.08	$ 0.37	$ 0.34	$ 1.00	$ 2.12	$ 1.48
Diluted net income (loss) per unit available to common unitholders	$ (0.39)	$ 0.80	$ 0.31	$ 0.26	$ 0.33	$ 1.06	$ 0.37	$ 0.34	$ 0.99	$ 2.12	$ 1.48