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Debt of the Operating Partnership (Summary of Outstanding Indebtedness) (Details)
$ in Thousands
3 Months Ended
Jan. 15, 2016
extension
Mar. 31, 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   $ (6,400) $ (7,200)
Unsecured Term Loans      
Debt Instrument [Line Items]      
Deferred financing costs   (4,400) (4,800)
Unsecured Senior Notes      
Debt Instrument [Line Items]      
Deferred financing costs   $ (36,700) (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 | 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   9,213,029  
Total indebtedness   9,147,712 8,648,618
Unamortized discounts   (17,978)  
Unamortized net premiums   217  
Long-term debt, net of discount (premium)   $ 9,195,268  
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   $ 958,480 558,191
Deferred financing costs   (6,359) (7,245)
Total indebtedness   952,121 $ 550,946
Unamortized discounts   0  
Unamortized net premiums   0  
Long-term debt, net of discount (premium)   $ 958,480  
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 | $ / £   1.40 1.35
Digital Realty Trust, L.P. | Global revolving credit facility | Euro (€)      
Debt Instrument [Line Items]      
Exchange rate | $ / €   1.23 1.20
Digital Realty Trust, L.P. | Unsecured Term Loans      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 1,432,931 $ 1,425,117
Deferred financing costs   (4,433) (4,784)
Total indebtedness   1,428,498 1,420,333
Unamortized discounts   0  
Unamortized net premiums   0  
Long-term debt, net of discount (premium)   1,432,931  
Digital Realty Trust, L.P. | Unsecured Term Loans | British pound sterling (£)      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 237,519 $ 229,011
Exchange rate | $ / £   1.40 1.35
Digital Realty Trust, L.P. | Unsecured Term Loans | Euro (€)      
Debt Instrument [Line Items]      
Exchange rate | $ / €   1.23 1.20
Digital Realty Trust, L.P. | Unsecured Term Loans | Unsecured term loan — 5-year      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 1,132,931 $ 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   $ 6,715,440  
Deferred financing costs   (36,735) (37,788)
Total indebtedness   6,660,727 6,570,757
Unamortized discounts   (17,978) (18,508)
Unamortized net premiums   0  
Long-term debt, net of discount (premium)   6,697,462 6,608,545
Digital Realty Trust, L.P. | Unsecured Senior Notes | Floating rate notes due 2019      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 154,050 150,063
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   $ 420,450 405,390
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   $ 739,440 720,300
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   $ 350,375 337,825
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   $ 560,600 540,520
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 | 3.300% notes due 2029      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 490,525 472,955
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   $ 106,178  
Deferred financing costs   (29) (29)
Total indebtedness   106,366 106,582
Unamortized discounts   0  
Unamortized net premiums   217 241
Long-term debt, net of discount (premium)   106,395 106,611
Digital Realty Trust, L.P. | Mortgage Loans | 731 East Trade Street      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 2,178 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