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Income Per Unit (Narrative) (Details)	9 Months Ended
Income Per Unit (Narrative) (Details)	Sep. 30, 2012	Sep. 30, 2011 Digital Realty Trust, L.P. [Member]
Shares of common stock contingently issuable	494,292	494,292

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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