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
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