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Debt of the Operating Partnership (Global Revolving Credit Facility) (Narrative) (Details) - Global revolving credit facility, net - Digital Realty Trust, L.P.		3 Months Ended
	Jan. 15, 2016 USD ($) extension	Mar. 31, 2018 USD ($)	Dec. 31, 2017	Aug. 15, 2013 USD ($)
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 2,000,000,000.0			$ 2,000,000,000.0
Number of extension options | extension	2
Revolving credit facility commitments extension	6 months
Interest rate basis spread		1.00%
Commitment fee percentage		0.20%
Weighted-average interest rate		2.52%	2.21%
Letter of credit security amount		$ 22,900,000
Accordian Feature
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 2,500,000,000
Prime Rate
Debt Instrument [Line Items]
Interest rate basis spread		4.75%

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Debt Instrument, Extension Length

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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