Subsequent Events (Details)					12 Months Ended
	Feb. 19, 2019 USD ($)	Jan. 18, 2019 USD ($)	Jan. 17, 2019 USD ($)	Jan. 16, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
5.875% notes due 2020 | Senior notes
Subsequent Event [Line Items]
Stated interest rate					5.875%
Digital Realty Trust, L.P.
Subsequent Event [Line Items]
Long-term debt, gross					$ 11,201,590,000
Digital Realty Trust, L.P. | Senior notes
Subsequent Event [Line Items]
Long-term debt, gross					7,649,538,000
Digital Realty Trust, L.P. | 5.875% notes due 2020 | Senior notes
Subsequent Event [Line Items]
Debt face amount					$ 500,000,000
Stated interest rate					5.875%
Proceeds form debt, net of issuance costs					$ 487,100,000
Long-term debt, gross					$ 500,000,000	$ 500,000,000
Subsequent Event | Digital Realty Trust, L.P. | 2.500% Notes Due 2026
Subsequent Event [Line Items]
Debt face amount | €				€ 850,000,000
Stated interest rate				2.50%
Proceeds form debt, net of issuance costs | €				€ 843,500,000
Subsequent Event | Digital Realty Trust, L.P. | 5.875% notes due 2020 | Senior notes
Subsequent Event [Line Items]
Amount not withdrawn			$ 350,100,000
Redemption price percentage		102.031%	70.02%
Tender offering consideration per transaction	$ 2.937500	$ 1,020.31	$ 1,022.81
Debt amount per transaction		1,000	1,000
Proceeds from sale of stock			$ 367,700,000
Withdrawn amount		$ 149,900,000