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Debt of the Operating Partnership (Global Revolving Credit Facility) (Narrative) (Details) - Global revolving credit facility, net - Digital Realty Trust, L.P. |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 15, 2016 USD ($) extension | Mar. 31, 2018 USD ($) | Dec. 31, 2017 | Aug. 15, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity | $ 2,000,000,000.0 |  |  | $ 2,000,000,000.0
Number of extension options | extension | 2 |  |  |
Revolving credit facility commitments extension | 6 months |  |  |
Interest rate basis spread |  | 1.00% |  |
Commitment fee percentage |  | 0.20% |  |
Weighted-average interest rate |  | 2.52% | 2.21% |
Letter of credit security amount |  | $ 22,900,000 |  |
Accordian Feature |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity | $ 2,500,000,000 |  |  |
Prime Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate basis spread |  | 4.75% |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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