Equity and Capital - Noncontrolling Interests in Operating Partnership (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Class of Stock
Number of units (units)	284,415,013	280,289,726
Percentage of total	98.00%	97.20%
Common stock conversion ratio	1
Digital Realty Trust, L.P.
Class of Stock
Redeemable noncontrolling interests - operating partnership	$ 1,074.7	$ 1,078.9
Common units held by third parties
Class of Stock
Common units held by third parties (units)	4,389,384	6,212,369
Percentage of total	1.50%	2.20%
Incentive units held by employees and directors (see Note 14)
Class of Stock
Incentive units held by employees and directors (units)	1,542,387	1,833,898
Percentage of total	0.50%	0.60%
Noncontrolling Interests in Operating Partnership
Class of Stock
Number of units (units)	290,346,784	288,335,993
Percentage of total	100.00%	100.00%