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Capital and Accumulated Other Comprehensive Loss Capital and Accumulated Other Comprehensive Loss (Forward Equity Sale) (Details) - Digital Realty Trust, L.P. - USD ($) $ in Billions | Sep. 27, 2019 | Sep. 27, 2018
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Forward Sale Agreement |  |
Class of Stock [Line Items] |  |
Common stock issued in public offering (in shares) |  | 9,775,000
Over-Allotment Option |  |
Class of Stock [Line Items] |  |
Common stock issued in public offering (in shares) |  | 1,275,000
Scenario, Forecast | Forward Sale Agreement |  |
Class of Stock [Line Items] |  |
Net proceeds on public offering | $ 1.1 |

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