Debt of the Operating Partnership (Outstanding Indebtedness - Global Revolving Credit Facility) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
SGD
Debt Instrument [Line Items]
Exchange rate	0.73		0.75
Digital Realty Trust, L.P. | GBP
Debt Instrument [Line Items]
Exchange rate	1.48		1.56
Digital Realty Trust, L.P. | EUR
Debt Instrument [Line Items]
Exchange rate	1.07		1.21
Digital Realty Trust, L.P. | AUD
Debt Instrument [Line Items]
Exchange rate	0.76		0.82
Digital Realty Trust, L.P. | Global revolving credit facility
Debt Instrument [Line Items]
Balance as of March 31, 2015	$ 826,906	[1],[2]	$ 525,951	[1],[2]
Weighted-average interest rate	1.55%	[1]	1.87%	[1]
Digital Realty Trust, L.P. | Global revolving credit facility | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	819,906	[3]	514,951	[3]
Weighted-average interest rate	1.54%	[3]	1.84%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | USD | Base Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	7,000	[1]	11,000	[1]
Weighted-average interest rate	3.35%	[1]	3.35%	[1]
Digital Realty Trust, L.P. | Global revolving credit facility | USD | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	317,000	[3]	90,000	[3]
Weighted-average interest rate	1.28%	[3]	1.27%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | GBP
Debt Instrument [Line Items]
Exchange rate	1.48		1.56
Digital Realty Trust, L.P. | Global revolving credit facility | GBP | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	125,360	[3],[4]	132,716	[3]
Weighted-average interest rate	1.62%	[3]	1.61%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | EUR
Debt Instrument [Line Items]
Exchange rate	1.07		1.21
Digital Realty Trust, L.P. | Global revolving credit facility | EUR | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	140,791	[3],[4]	58,071	[3],[5]
Weighted-average interest rate	1.05%	[3]	1.13%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | AUD
Debt Instrument [Line Items]
Exchange rate	0.76		0.82
Digital Realty Trust, L.P. | Global revolving credit facility | AUD | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	70,061	[3],[4]	72,676	[3],[5]
Weighted-average interest rate	3.35%	[3]	3.74%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | HKD
Debt Instrument [Line Items]
Exchange rate	0.13		0.13
Digital Realty Trust, L.P. | Global revolving credit facility | HKD | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	87,417	[3],[4]	79,336	[3],[5]
Weighted-average interest rate	1.34%	[3]	1.34%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | JPY
Debt Instrument [Line Items]
Exchange rate	0.01		0.01
Digital Realty Trust, L.P. | Global revolving credit facility | JPY | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	13,235	[3],[4]	13,201	[3],[5]
Weighted-average interest rate	1.17%	[3]	1.17%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | SGD
Debt Instrument [Line Items]
Exchange rate	0.73		0.75
Digital Realty Trust, L.P. | Global revolving credit facility | SGD | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	4,153	[3],[4]	6,565	[3],[5]
Weighted-average interest rate	1.86%	[3]	1.64%	[3]
Digital Realty Trust, L.P. | Global revolving credit facility | CAD
Debt Instrument [Line Items]
Exchange rate	0.79		0.86
Digital Realty Trust, L.P. | Global revolving credit facility | CAD | Floating Rate
Debt Instrument [Line Items]
Balance as of March 31, 2015	$ 61,889	[3],[4]	$ 62,386	[3],[5]
Weighted-average interest rate	2.10%	[3]	2.39%	[3]

[1] The interest rates for base rate borrowings under the global revolving credit facility equal the U.S. Prime Rate plus a margin of 10 basis points, which is based on the credit ratings of our long-term debt.

[2] Balances as of March 31, 2015 and December 31, 2014 are as follows (balances, in thousands):Denomination of DrawBalance as of March 31, 2015 Weighted-averageinterest rateBalance as of December 31, 2014 Weighted-averageinterest rateFloating Rate Borrowing (a)U.S. dollar ($)$317,0001.28%$90,0001.27%British pound sterling (£)125,360(c)1.62% 132,7161.61%Euro (€)140,791(c)1.05%58,071(d)1.13%Australian dollar (AUD)70,061(c)3.35%72,676(d)3.74%Hong Kong dollar (HKD)87,417(c)1.34%79,336(d)1.34%Japanese yen (JPY)13,235(c)1.17%13,201(d)1.17%Singapore dollar (SGD)4,153(c)1.86% 6,565(d)1.64%Canadian dollar (CAD)61,889(c)2.10%62,386(d)2.39%Total$819,906 1.54%$514,951 1.84%Base Rate Borrowing (b) U.S. dollar ($)$7,000 3.35%$11,000 3.35%Total borrowings$826,906 1.55%$525,951 1.87%(a)The interest rates for floating rate borrowings under the global revolving credit facility equal the applicable index plus a margin of 110 basis points, which is based on the credit ratings of our long-term debt.(b)The interest rates for base rate borrowings under the global revolving credit facility equal the U.S. Prime Rate plus a margin of 10 basis points, which is based on the credit ratings of our long-term debt.(c)Based on exchange rates of $1.48 to £1.00, $1.07 to €1.00, $0.76 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.73 to 1.00 SGD and $0.79 to 1.00 CAD, respectively, as of March 31, 2015.(d)Based on exchange rates of $1.21 to €1.00, $0.82 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.75 to 1.00 SGD and $0.86 to 1.00 CAD, respectively, as of December 31, 2014.

[3] The interest rates for floating rate borrowings under the global revolving credit facility equal the applicable index plus a margin of 110 basis points, which is based on the credit ratings of our long-term debt.

[4] Based on exchange rates of $1.48 to £1.00, $1.07 to €1.00, $0.76 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.73 to 1.00 SGD and $0.79 to 1.00 CAD, respectively, as of March 31, 2015.

[5] Based on exchange rates of $1.21 to €1.00, $0.82 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.75 to 1.00 SGD and $0.86 to 1.00 CAD, respectively, as of December 31, 2014.