Debt of the Operating Partnership (Senior Notes) (Narrative) (Details) - Digital Realty Trust, L.P. - 5.875% notes due 2020 - Unsecured senior notes	12 Months Ended
	Dec. 31, 2018
Debt of the Operating Partnership [Line Items]
Leverage ratio	60.00%
Secured debt leverage ratio, maximum	40.00%
Interest coverage ratio	1.50
Total unencumbered assets	150.00%