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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 (£)
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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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