Debt of the Operating Partnership (Outstanding Indebtedness - Unsecured Term Loan) (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. | Unsecured term loan
Debt Instrument [Line Items]
Balance as of March 31, 2015	$ 942,006	[1]	$ 976,600	[1]
Weighted-average interest rate	1.67%	[2]	1.66%	[3]
Digital Realty Trust, L.P. | Unsecured term loan | Interest Rate Swap
Debt Instrument [Line Items]
Weighted-average interest rate	1.97%		2.00%
Digital Realty Trust, L.P. | Unsecured term loan | USD
Debt Instrument [Line Items]
Balance as of March 31, 2015	410,905		410,905
Weighted-average interest rate	1.38%	[2]	1.36%	[3]
Digital Realty Trust, L.P. | Unsecured term loan | USD | Interest Rate Swap
Debt Instrument [Line Items]
Weighted-average interest rate	1.92%		1.92%
Digital Realty Trust, L.P. | Unsecured term loan | SGD
Debt Instrument [Line Items]
Balance as of March 31, 2015	166,485	[4]	172,426	[5]
Weighted-average interest rate	1.75%	[2]	1.45%	[3]
Digital Realty Trust, L.P. | Unsecured term loan | SGD | Interest Rate Swap
Debt Instrument [Line Items]
Weighted-average interest rate	2.10%		2.01%
Digital Realty Trust, L.P. | Unsecured term loan | GBP
Debt Instrument [Line Items]
Balance as of March 31, 2015	179,187	[4]	188,365	[5]
Weighted-average interest rate	1.76%		1.76%
Digital Realty Trust, L.P. | Unsecured term loan | EUR
Debt Instrument [Line Items]
Balance as of March 31, 2015	106,773	[4]	120,375	[5]
Weighted-average interest rate	1.19%		1.22%
Digital Realty Trust, L.P. | Unsecured term loan | AUD
Debt Instrument [Line Items]
Balance as of March 31, 2015	$ 78,656	[4]	$ 84,529	[5]
Weighted-average interest rate	3.50%		3.98%

[1] 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 rate Balance as of December 31, 2014 Weighted-averageinterest rate U.S. dollar ($)$410,9051.38%(b)$410,9051.36%(d)Singapore dollar (SGD)166,485(a)1.75%(b)172,426(c)1.45%(d)British pound sterling (£)179,187(a)1.76%188,365(c)1.76%Euro (€)106,773(a)1.19%120,375(c)1.22%Australian dollar (AUD)78,656(a)3.50%84,529(c)3.98%Total$942,006 1.67%(b)$976,6001.66%(d)(a)Based on exchange rates of $0.73 to 1.00 SGD, $1.48 to £1.00, $1.07 to €1.00 and $0.76 to 1.00 AUD, respectively, as of March 31, 2015.(b)As of March 31, 2015, the weighted-average interest rate reflecting interest rate swaps was 1.92% (U.S. dollar), 2.10% (Singapore dollar) and 1.97% (Total). See Note 14 for further discussion on interest rate swaps.(c)Based on exchange rates of $0.75 to 1.00 SGD, $1.56 to £1.00, $1.21 to €1.00 and $0.82 to 1.00 AUD, respectively, as of December 31, 2014.(d)As of December 31, 2014, the weighted-average interest rate reflecting interest rate swaps was 1.92% (U.S. dollar), 2.01% (Singapore dollar) and 2.00% (Total). See Note 14 for further discussion on interest rate swaps.

[2] As of March 31, 2015, the weighted-average interest rate reflecting interest rate swaps was 1.92% (U.S. dollar), 2.10% (Singapore dollar) and 1.97% (Total). See Note 14 for further discussion on interest rate swaps.

[3] As of December 31, 2014, the weighted-average interest rate reflecting interest rate swaps was 1.92% (U.S. dollar), 2.01% (Singapore dollar) and 2.00% (Total). See Note 14 for further discussion on interest rate swaps.

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

[5] Based on exchange rates of $0.75 to 1.00 SGD, $1.56 to £1.00, $1.21 to €1.00 and $0.82 to 1.00 AUD, respectively, as of December 31, 2014.