Organization - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Sep. 20, 2017	Apr. 06, 2017	Jul. 31, 2014	Feb. 11, 2014
Subsidiary, Sale of Stock [Line Items]
Limited liability partnership percentage of interest held					99.00%
Limited partnership, purchase price					$ 200,000.0
Initial capital contribution					$ 1,000
General partner percentage interest obtained					1.00%
Offering amount in sales of shares				$ 2,200,000,000
Minimum holding period for redemption of stock	1 year
Redemption price as percentage of Net Asset Value of outstanding shares (percent)	100.00%
IPO
Subsidiary, Sale of Stock [Line Items]
Offering amount in sales of shares				2,000,000,000
Follow-on Offering
Subsidiary, Sale of Stock [Line Items]
Offering amount in sales of shares		$ 2,200,000,000.0
Primary Offering
Subsidiary, Sale of Stock [Line Items]
Offering amount in sales of shares		2,000,000,000.0
Distribution Reinvestment Plan
Subsidiary, Sale of Stock [Line Items]
Common stock of the Company pursuant to the distribution reinvestment plan (in shares)		$ 200,000,000.0		$ 200,000,000
Share registration of stock to be sold (shares)			3,000,000.0