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Debt of the Operating Partnership (Schedule of Debt Maturities And Principal Maturities) (Details) - Digital Realty Trust, L.P. $ in Thousands	Jan. 15, 2016 extension	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Remainder of 2018		$ 401
2019		154,694
2020		1,959,613
2021		1,532,931
2022		800,000
Thereafter		4,765,390
Subtotal		9,213,029
Unamortized discounts		(17,978)
Unamortized premium		217
Long-term debt, net of discount (premium)		9,195,268
Global revolving credit facility, net
Debt Instrument [Line Items]
Remainder of 2018		0
2019		0
2020		958,480
2021		0
2022		0
Thereafter		0
Subtotal		958,480	$ 558,191
Unamortized discounts		0
Unamortized premium		0
Long-term debt, net of discount (premium)		958,480
Number of extension options | extension	2
Revolving credit facility commitments extension	6 months
Unsecured Term Loans
Debt Instrument [Line Items]
Remainder of 2018		0
2019		0
2020		0
2021		1,132,931
2022		0
Thereafter		300,000
Subtotal		1,432,931	1,425,117
Unamortized discounts		0
Unamortized premium		0
Long-term debt, net of discount (premium)		1,432,931
Unsecured Senior Notes
Debt Instrument [Line Items]
Remainder of 2018		0
2019		154,050
2020		1,000,000
2021		400,000
2022		800,000
Thereafter		4,361,390
Subtotal		6,715,440
Unamortized discounts		(17,978)	(18,508)
Unamortized premium		0
Long-term debt, net of discount (premium)		6,697,462	6,608,545
Mortgage Loans
Debt Instrument [Line Items]
Remainder of 2018		401
2019		644
2020		1,133
2021		0
2022		0
Thereafter		104,000
Subtotal		106,178
Unamortized discounts		0
Unamortized premium		217	241
Long-term debt, net of discount (premium)		$ 106,395	$ 106,611

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