Debt of Operating Partnership (3.750% Notes due 2030) (Details) - Subsequent Event Type - 3.750% Notes due 2030 - Digital Realty Trust, L.P. $ in Millions	Oct. 17, 2018 USD ($)	Oct. 17, 2018 GBP (£)	Oct. 17, 2018 GBP (£)
Debt Instrument [Line Items]
Debt face amount	$ 524.6		£ 400,000,000.0
Net proceeds from offering	$ 516.1	£ 393,500,000
Covenant, leverage ratio percentage, required maximum	60.00%	60.00%
Covenant, secured leverage ratio, allowable maximum	40.00%	40.00%
Covenant, interest coverage ratio, required minimum	1.50	1.50
Covenant, unencumbered assets to unsecured debt	150.00%	150.00%
Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.75%		3.75%

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Debt Instrument, Covenant, Leverage Ratio Percentage

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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