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Debt of the Operating Partnership (Summary of Outstanding Indebtedness) (Details) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jan. 15, 2016 extension | Sep. 30, 2018 USD ($) $ / € $ / £ | Dec. 31, 2017 USD ($) $ / € $ / £
3.950% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 3.95% |
3.625% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 3.625% |
2.625% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 2.625% |
2.750% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 2.75% |
4.750% notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.75% |
Global revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Deferred financing costs |  | $ (4,700) | $ (7,200)
Unsecured Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Deferred financing costs |  | (3,700) | (4,800)
Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Deferred financing costs |  | $ (38,300) | (37,800)
Unsecured Senior Notes | 5.875% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 5.875% |
Unsecured Senior Notes | 5.250% notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 5.25% |
Unsecured Senior Notes | 3.950% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 3.95% |
Unsecured Senior Notes | 3.625% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 3.625% |
Unsecured Senior Notes | 2.750% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 2.75% |
Unsecured Senior Notes | 4.750% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.75% |
Unsecured Senior Notes | 2.625% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 2.625% |
Unsecured Senior Notes | 2.750% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 2.75% |
Unsecured Senior Notes | 4.250% notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.25% |
Unsecured Senior Notes | 4.750% notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.75% |
Unsecured Senior Notes | 3.700% notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 3.70% |
Unsecured Senior Notes | 4.450% notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.45% |
Unsecured Senior Notes | 3.300% notes due 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 3.30% |
Mortgage Loans |  |  |
Debt Instrument [Line Items] |  |  |
Deferred financing costs |  | $ 0 | 0
Digital Realty Trust, L.P. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 9,242,935 |
Total indebtedness |  | 9,179,871 | 8,648,618
Unamortized discounts |  | (16,495) |
Unamortized net premiums |  | 171 |
Long-term debt, net of discount (premium) |  | $ 9,226,611 |
Digital Realty Trust, L.P. | Unsecured term loan — 5-year |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate basis spread |  | 1.10% |
Debt instrument term | 5 years |  |
Digital Realty Trust, L.P. | Unsecured term loan — 7-year |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate basis spread |  | 1.55% |
Debt instrument term | 7 years |  |
Digital Realty Trust, L.P. | Global revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 594,983 | 558,191
Deferred financing costs |  | (4,694) | (7,245)
Total indebtedness |  | 590,289 | $ 550,946
Unamortized discounts |  | 0 |
Unamortized net premiums |  | 0 |
Long-term debt, net of discount (premium) |  | $ 594,983 |
Commitment fee percentage |  | 0.20% |
Number of extension options | extension | 2 |  |
Debt instrument, extension term | 6 months |  |
Interest rate basis spread |  | 1.00% |
Digital Realty Trust, L.P. | Global revolving credit facility | British pound sterling (£) |  |  |
Debt Instrument [Line Items] |  |  |
Exchange rate | $ / £ |  |  | 1.35
Digital Realty Trust, L.P. | Global revolving credit facility | Euro (€) |  |  |
Debt Instrument [Line Items] |  |  |
Exchange rate | $ / € |  | 1.16 | 1.20
Digital Realty Trust, L.P. | Unsecured Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 1,356,702 | $ 1,425,117
Deferred financing costs |  | (3,733) | (4,784)
Total indebtedness |  | 1,352,969 | 1,420,333
Unamortized discounts |  | 0 |
Unamortized net premiums |  | 0 |
Long-term debt, net of discount (premium) |  | 1,356,702 |
Digital Realty Trust, L.P. | Unsecured Term Loans | British pound sterling (£) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 220,843 | $ 229,011
Exchange rate | $ / £ |  | 1.30 | 1.35
Digital Realty Trust, L.P. | Unsecured Term Loans | Euro (€) |  |  |
Debt Instrument [Line Items] |  |  |
Exchange rate | $ / € |  | 1.16 | 1.20
Digital Realty Trust, L.P. | Unsecured Term Loans | Unsecured term loan — 5-year |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 1,056,702 | $ 1,125,117
Interest rate basis spread |  | 1.10% |
Debt instrument term |  | 5 years |
Digital Realty Trust, L.P. | Unsecured Term Loans | Unsecured term loan — 7-year |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 300,000 | 300,000
Interest rate basis spread |  | 1.55% |
Debt instrument term |  | 7 years |
Digital Realty Trust, L.P. | Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 7,185,320 |
Deferred financing costs |  | (38,284) | (37,788)
Total indebtedness |  | 7,130,541 | 6,570,757
Unamortized discounts |  | (16,495) | (18,508)
Unamortized net premiums |  | 0 |
Long-term debt, net of discount (premium) |  | 7,168,825 | 6,608,545
Digital Realty Trust, L.P. | Unsecured Senior Notes | Floating rate notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 145,050 | 150,063
Digital Realty Trust, L.P. | Unsecured Senior Notes | Floating rate notes due 2019 | EURIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate basis spread |  | 0.50% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 5.875% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 500,000 | 500,000
Stated interest rate |  | 5.875% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.400% notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 500,000 | 500,000
Stated interest rate |  | 3.40% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 5.250% notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 400,000 | 400,000
Stated interest rate |  | 5.25% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.950% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 500,000 | 500,000
Stated interest rate |  | 3.95% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.625% notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 300,000 | 300,000
Stated interest rate |  | 3.625% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 2.750% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 350,000 | 350,000
Stated interest rate |  | 2.75% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.750% notes due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 390,930 | 405,390
Stated interest rate |  | 4.75% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 2.625% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 696,240 | 720,300
Stated interest rate |  | 2.625% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 2.750% notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 325,775 | 337,825
Stated interest rate |  | 2.75% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.250% notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 521,240 | 540,520
Stated interest rate |  | 4.25% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.750% notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 450,000 | 450,000
Stated interest rate |  | 4.75% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.700% notes due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 1,000,000 | 1,000,000
Stated interest rate |  | 3.70% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 4.450% notes due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 650,000 | 0
Stated interest rate |  | 4.45% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | 3.300% notes due 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 456,085 | 472,955
Stated interest rate |  | 3.30% |
Digital Realty Trust, L.P. | Unsecured Senior Notes | Secured note due 2023 | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate basis spread |  | 1.10% |
Digital Realty Trust, L.P. | Mortgage Loans |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 105,930 |
Deferred financing costs |  | (29) | (29)
Total indebtedness |  | 106,072 | 106,582
Unamortized discounts |  | 0 |
Unamortized net premiums |  | 171 | 241
Long-term debt, net of discount (premium) |  | 106,101 | 106,611
Digital Realty Trust, L.P. | Mortgage Loans | 731 East Trade Street |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 1,930 | 2,370
Effective interest rate (as a percent) |  | 8.22% |
Digital Realty Trust, L.P. | Mortgage Loans | Secured note due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 104,000 | $ 104,000

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