Debt of the Operating Partnership (Narrative) (Details)	9 Months Ended
	Sep. 30, 2020
Debt Instrument [Line Items]
Leverage ratio	60.00%
Secured debt leverage ratio, maximum	40.00%
Interest coverage ratio	1.50
Total unencumbered assets	150.00%
Senior Notes | 2.500% notes due 2026
Debt Instrument [Line Items]
Stated interest rate	2.50%
Senior Notes | 2.500% notes due 2026 | Digital Realty Trust, L.P.
Debt Instrument [Line Items]
Stated interest rate	2.50%
Senior Notes | 3.600% notes due 2029 | Digital Realty Trust, L.P.
Debt Instrument [Line Items]
Stated interest rate	3.60%