Equity - Narrative (Details)								3 Months Ended				6 Months Ended		12 Months Ended	42 Months Ended	83 Months Ended
		Jun. 15, 2021 USD ($) shares	Mar. 25, 2021 USD ($) shares	Mar. 01, 2021 shares	Jan. 22, 2021 USD ($) shares	Jan. 15, 2020 USD ($) shares	May 01, 2019 USD ($) shares	Jun. 30, 2021 USD ($) vote $ / shares shares	Mar. 31, 2021 shares	Jun. 30, 2020 $ / shares shares	Sep. 30, 2019 USD ($) shares	Jun. 30, 2021 USD ($) vote $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2021 USD ($) vote $ / shares shares	Oct. 29, 2020 shares	Jul. 17, 2020 USD ($)	Mar. 31, 2020 shares	Feb. 26, 2020 USD ($)	Dec. 31, 2019 shares	Apr. 30, 2019 shares	Jun. 30, 2015 shares
Class of Stock [Line Items]
Proceeds from sale of shares | $															$ 2,800,000,000
Number of shares outstanding (in shares)								323,910,617				323,910,617		230,320,668		323,910,617
Shares issued | $	[1]							$ 324,000				$ 324,000		$ 230,000		$ 324,000
2021 Restricted Stock Units
Class of Stock [Line Items]
Fair value of grants issued | $		$ 400,000
Share Redemption Program
Class of Stock [Line Items]
Minimum ownership balance (shares) | $								2,500				$ 2,500				2,500
Minimum holding period for stock to be redeemed from stockholder by the Company												1 year
Private Placement
Class of Stock [Line Items]
Number of shares issued (shares)																							43,772,611
Stock authorized under offering (shares) | $																				$ 2,000,000,000.0
Follow-on Offering
Class of Stock [Line Items]
Stock authorized under offering (shares) | $																				2,200,000,000
Distribution Reinvestment Plan
Class of Stock [Line Items]
Stock authorized under offering (shares) | $																		$ 100,000,000		$ 200,000,000
Shares issued | $								333,100,000				$ 333,100,000		$ 318,200,000		333,100,000
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)												1,619,255		589,248
Total compensation expense | $												$ 2,100,000	$ 1,100,000
Shares used to satisfy employee tax withholding requirements on vesting restricted stock (shares)												83,027
RSUs | 2019 Restricted Stock Units
Class of Stock [Line Items]
RSU's issued (in shares)							1,009,415
Vesting installment (percent)							25.00%
Fair value of grants issued | $							$ 9,700,000
Unrecognized cost | $								3,400,000				$ 3,400,000				3,400,000
Unrecognized cost recognition period												2 years
RSUs | 2020 Restricted Stock Units
Class of Stock [Line Items]
RSU's issued (in shares)						589,248
Fair value of grants issued | $						$ 5,500,000
Unrecognized cost | $								2,700,000				$ 2,700,000				2,700,000
Unrecognized cost recognition period												3 years
Vesting (percent)						25.00%
RSUs | 2021 Restricted Stock Units | Award Date January 22, 2021
Class of Stock [Line Items]
RSU's issued (in shares)					1,071,347
Fair value of grants issued | $					$ 9,600,000
Unrecognized cost | $								7,000,000.0				$ 7,000,000.0				7,000,000.0
Unrecognized cost recognition period												3 years
RSUs | 2021 Restricted Stock Units | Award Date March 25, 2021
Class of Stock [Line Items]
RSU's issued (in shares)			547,908
Fair value of grants issued | $			$ 4,900,000
Unrecognized cost | $								$ 4,600,000				$ 4,600,000				$ 4,600,000
Unrecognized cost recognition period												4 years
Restricted Stock | Former directors
Class of Stock [Line Items]
RSU's issued (in shares)		49,614		3,901
Restricted Stock | Former directors | Vesting upon issuance
Class of Stock [Line Items]
Vesting (percent)		50.00%
Restricted Stock | Former directors | Vesting one year after grant date
Class of Stock [Line Items]
Vesting period		1 year
Common Class T
Class of Stock [Line Items]
Number of shares outstanding (in shares)								562,857				562,857				562,857
Number of votes each share is entitled to | vote								1				1				1
Common Class S
Class of Stock [Line Items]
Number of shares outstanding (in shares)								1,800				1,800				1,800
Number of votes each share is entitled to | vote								1				1				1
Common Class D
Class of Stock [Line Items]
Number of shares outstanding (in shares)								41,705				41,705				41,705
Number of votes each share is entitled to | vote								1				1				1
Common Class I
Class of Stock [Line Items]
Number of shares outstanding (in shares)								1,906,996				1,906,996				1,906,996
Number of votes each share is entitled to | vote								1				1				1
Common Class A
Class of Stock [Line Items]
Number of shares outstanding (in shares)								24,476,465				24,476,465				24,476,465
Number of votes each share is entitled to | vote								1				1				1
Common Class AA
Class of Stock [Line Items]
Number of shares outstanding (in shares)								47,527,441				47,527,441				47,527,441
Number of votes each share is entitled to | vote								1				1				1
Common Class AAA
Class of Stock [Line Items]
Number of shares outstanding (in shares)								923,897				923,897				923,897
Number of votes each share is entitled to | vote								1				1				1
Common Class E
Class of Stock [Line Items]
Number of shares outstanding (in shares)								248,469,456				248,469,456				248,469,456
Number of votes each share is entitled to | vote								1				1				1
Common Class E | 2021 Restricted Stock Units | Award Date March 25, 2021
Class of Stock [Line Items]
Number of shares contingently entitled to be received for each RSU (shares)			1
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
Common Class E | Private Placement
Class of Stock [Line Items]
Number of shares issued (shares)																	93,457,668					174,981,547
Common Stock
Class of Stock [Line Items]
Number of shares outstanding (in shares)								323,910,617	323,881,102	229,897,937		323,910,617	229,897,937	230,320,668	323,881,102	323,910,617			229,671,555		227,853,720
Stock redeemed during period (in shares)								871,550		301		1,643,814	548,613
Weighted average price per share (in dollars per share) | $ / shares								$ 9.06		$ 9.33		$ 9.01	$ 9.32
Shares used to satisfy employee tax withholding requirements on vesting restricted stock (shares)									99,298
Common Stock | Share Redemption Program
Class of Stock [Line Items]
Stock redeemed during period (in shares)								437,298								27,716,267
Stock redeemed, value | $																$ 260,100,000
Weighted average price per share (in dollars per share) | $ / shares																$ 9.38
Common Stock | Common Class E | RSUs | 2020 Restricted Stock Units
Class of Stock [Line Items]
Number of shares contingently entitled to be received for each RSU (shares)						1

[1] See Note 9, Equity, for the number of shares outstanding of each class of common stock as of June 30, 2021.