Equity - Narrative (Details)			3 Months Ended			9 Months Ended		24 Months Ended	36 Months Ended	74 Months Ended
		Jan. 15, 2020 USD ($) shares	Sep. 30, 2020 USD ($) vote $ / shares shares	Dec. 31, 2019 USD ($) shares	Sep. 30, 2019 $ / shares shares	Sep. 30, 2020 USD ($) vote $ / shares shares	Sep. 30, 2019 $ / shares shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) vote shares	Sep. 30, 2020 USD ($) vote $ / shares shares	Jun. 30, 2020 shares	Mar. 31, 2020 shares	Jun. 30, 2019 shares	Mar. 31, 2019 shares	Dec. 31, 2018 shares
Class of Stock [Line Items]
Number of shares outstanding (in shares)			229,775,115	227,853,720		229,775,115			229,775,115	229,775,115
Proceeds from sale of shares | $								$ 2,800,000,000	$ 2,800,000,000
Number of shares issued (shares)			283,769,972			283,769,972			283,769,972	283,769,972
Shares issued | $	[1]		$ 230,000	$ 228,000		$ 230,000			$ 230,000	$ 230,000
Share Redemption Program
Class of Stock [Line Items]
Minimum ownership balance (shares) | $			2,500			$ 2,500			2,500	2,500
Minimum holding period for stock to be redeemed from stockholder by the Company						1 year
Distribution Reinvestment Plan
Class of Stock [Line Items]
Period for written notice						10 days
Shares issued | $			$ 310,800,000	$ 293,700,000		$ 310,800,000			$ 310,800,000	$ 310,800,000
Maximum | Share Redemption Program
Class of Stock [Line Items]
Aggregate redemption of Company's shares (percent)				5.00%		5.00%
RSUs
Class of Stock [Line Items]
RSU's issued (in shares)		589,248
Vesting (percent)		25.00%
Fair value of grants issued | $		$ 5,500,000
Total forfeitures (shares)						3,209
Common Class T
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			555,730			555,730			555,730	555,730
Common Class S
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			1,800			1,800			1,800	1,800
Common Class D
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			40,791			40,791			40,791	40,791
Common Class I
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			1,894,561			1,894,561			1,894,561	1,894,561
Common Class A
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			24,227,432			24,227,432			24,227,432	24,227,432
Common Class AA
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			47,184,766			47,184,766			47,184,766	47,184,766
Common Class AAA
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			917,756			917,756			917,756	917,756
Common Class E
Class of Stock [Line Items]
Number of votes each share is entitled to | vote			1			1			1	1
Number of shares outstanding (in shares)			154,952,279			154,952,279			154,952,279	154,952,279
Common Class E | Share Redemption Program
Class of Stock [Line Items]
Excess of quarterly cap limitation (in shares)				2,872,488
Excess of quarterly cap limitation | $				$ 27,400,000
Percentage of redemption requests not redeemed (percent)				25.00%
Common Stock
Class of Stock [Line Items]
Number of shares outstanding (in shares)			229,775,115	227,853,720	235,382,622	229,775,115	235,382,622	235,382,622	229,775,115	229,775,115	229,897,937	229,671,555	243,610,554	174,981,549	174,278,341
Common Stock | Share Redemption Program
Class of Stock [Line Items]
Stock redeemed during period (in shares)			693,199		10,589,361	1,241,812	10,589,361			25,472,376
Stock redeemed, value | $										$ 240,000,000.0
Weighted average price per share (in dollars per share) | $ / shares			$ 8.86		$ 9.54	$ 9.07	$ 9.54			$ 9.42
Redemption requests that were not redeemed (shares)			693,199
Common Stock | Common Class E
Class of Stock [Line Items]
Number of shares contingently entitled to be received for each RSU (shares)			1			1			1	1

[1] See Note 9, Equity, for the number of shares outstanding of each class of common stock as of September 30, 2020.