Debt of the Operating Partnership (Global Revolving Credit Facilities) (Narrative) (Details) - Digital Realty Trust, L.P. $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) item
Debt Instrument [Line Items]
Early extinguishment charge	$ 0.9
Global revolving credit facilities, net
Debt Instrument [Line Items]
Number of extension options | item		2
Debt instrument, extension term		6 months
Interest rate basis spread		0.90%
Commitment fee percentage		0.20%
Letters of credit issued	$ 55.3	$ 55.3
Yen Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage		0.50%