Equity and Capital - Noncontrolling Interests in Operating Partnership (Details) - USD ($) shares in Thousands, $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Class of Stock
Number of units (units)	287,509	284,415
Percentage of total	97.90%	98.00%
Common stock conversion ratio	1
Digital Realty Trust, L.P.
Class of Stock
Redeemable noncontrolling interests - operating partnership	$ 585.1	$ 1,074.7
Common units held by third parties
Class of Stock
Common units held by third parties (units)	4,387	4,389
Percentage of total	1.50%	1.50%
Incentive units held by employees and directors (see Note 14)
Class of Stock
Incentive units held by employees and directors (units)	1,908	1,543
Percentage of total	0.60%	0.50%
Noncontrolling Interests in Operating Partnership
Class of Stock
Number of units (units)	293,804	290,347
Percentage of total	100.00%	100.00%