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Debt of the Operating Partnership (Unsecured Term Loan) (Narrative) (Details) - USD ($) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 15, 2016 | Sep. 30, 2018 | Dec. 31, 2017 | Apr. 16, 2012
Unsecured Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity | $ 1.55 |  |  |
Digital Realty Trust, L.P. |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 9,242,935,000 |  |
Digital Realty Trust, L.P. | Unsecured Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,356,702,000 | $ 1,425,117,000 |
Digital Realty Trust, L.P. | Unsecured term loan — 5-year |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity | $ 1,250,000,000.00 |  |  |
Debt instrument term | 5 years |  |  |
Interest rate basis spread |  | 1.10% |  |
Digital Realty Trust, L.P. | Unsecured term loan — 5-year | Unsecured Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument term |  | 5 years |  |
Interest rate basis spread |  | 1.10% |  |
Long-term debt, gross |  | $ 1,056,702,000 | 1,125,117,000 |
Digital Realty Trust, L.P. | Unsecured term loan — 7-year |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity | $ 300,000,000 |  |  |
Debt instrument term | 7 years |  |  |
Interest rate basis spread |  | 1.55% |  |
Digital Realty Trust, L.P. | Unsecured term loan — 7-year | Unsecured Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument term |  | 7 years |  |
Interest rate basis spread |  | 1.55% |  |
Long-term debt, gross |  | $ 300,000,000 | $ 300,000,000 |
Digital Realty Trust, L.P. | Unsecured Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity |  | 1,550,000,000.00 |  | $ 1,000,000,000.0
Credit facility, maximum borrowing capacity, subject to receipt of lender commitments and other conditions |  | $ 1,800,000,000.0 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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