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Equity - Narrative (Details)
 3 Months Ended 12 Months Ended 42 Months Ended 77 Months Ended 80 Months Ended
Mar. 25, 2021
USD ($)
shares
Mar. 01, 2021
shares
Jan. 22, 2021
USD ($)
shares
Jan. 15, 2020
USD ($)
shares
May 01, 2019
USD ($)
shares
Mar. 31, 2021
USD ($)
vote
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Mar. 31, 2021
USD ($)
vote
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
vote
shares
Oct. 29, 2020
shares
Jul. 17, 2020
USD ($)
Feb. 26, 2020
USD ($)
Apr. 30, 2019
shares
Jun. 30, 2015
shares
Class of Stock [Line Items]                                    
Number of shares outstanding (in shares)           323,881,102       230,320,668 323,881,102 230,320,668 323,881,102          
Proceeds from sale of shares | $                     $ 2,800,000,000              
Shares issued | $ [1]           $ 324,000       $ 230,000 324,000 $ 230,000 $ 324,000          
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                        
Distribution Reinvestment Plan                                    
Class of Stock [Line Items]                                    
Stock authorized under offering (shares) | $                             $ 100,000,000 $ 200,000,000    
Period for written notice           10 days                        
Shares issued | $           $ 325,400,000       $ 318,200,000 325,400,000 $ 318,200,000 325,400,000          
Follow-on Offering                                    
Class of Stock [Line Items]                                    
Stock authorized under offering (shares) | $                               2,200,000,000    
Private Placement [Member]                                    
Class of Stock [Line Items]                                    
Number of shares issued (shares)                                   43,772,611
Stock authorized under offering (shares) | $                               $ 2,000,000,000.0    
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                
Share-based Payment Arrangement, Expense | $           $ 1,700,000 $ 1,000,000.0                      
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 | $           $ 3,900,000         3,900,000   3,900,000          
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 | $           $ 3,000,000.0         3,000,000.0   3,000,000.0          
Unrecognized cost recognition period           3 years                        
Vesting (percent)       25.00%                            
RSUs | 2021 Restricted Stock Units                                    
Class of Stock [Line Items]                                    
RSU's issued (in shares) 547,908   1,071,347                              
Fair value of grants issued | $ $ 4,900,000   $ 9,600,000                              
Unrecognized cost | $           $ 7,700,000         $ 7,700,000   $ 7,700,000          
Unrecognized cost recognition period           3 years                        
Restricted Stock | Former directors                                    
Class of Stock [Line Items]                                    
RSU's issued (in shares)   3,901                                
Common Class T                                    
Class of Stock [Line Items]                                    
Number of votes each share is entitled to | vote           1         1   1          
Number of shares outstanding (in shares)           560,462         560,462   560,462          
Common Class S                                    
Class of Stock [Line Items]                                    
Number of votes each share is entitled to | vote           1         1   1          
Number of shares outstanding (in shares)           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          
Number of shares outstanding (in shares)           41,396         41,396   41,396          
Common Class I                                    
Class of Stock [Line Items]                                    
Number of votes each share is entitled to | vote           1         1   1          
Number of shares outstanding (in shares)           1,902,061         1,902,061   1,902,061          
Common Class A                                    
Class of Stock [Line Items]                                    
Number of votes each share is entitled to | vote           1         1   1          
Number of shares outstanding (in shares)           24,415,356         24,415,356   24,415,356          
Common Class AA                                    
Class of Stock [Line Items]                                    
Number of votes each share is entitled to | vote           1         1   1          
Number of shares outstanding (in shares)           47,432,524         47,432,524   47,432,524          
Common Class AAA                                    
Class of Stock [Line Items]                                    
Number of votes each share is entitled to | vote           1         1   1          
Number of shares outstanding (in shares)           920,743         920,743   920,743          
Common Class E                                    
Class of Stock [Line Items]                                    
Number of votes each share is entitled to | vote           1         1   1          
Number of shares outstanding (in shares)           248,606,760         248,606,760   248,606,760          
Common Class E | 2021 Restricted Stock Units                                    
Class of Stock [Line Items]                                    
Number of shares contingently entitled to be received for each RSU (shares) 1   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                  
Percentage of redemption requests not redeemed (percent)               25.00%                    
Common Class E | Private Placement [Member]                                    
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)           323,881,102 229,671,555 227,853,720   230,320,668 323,881,102 230,320,668 323,881,102          
Stock redeemed during period (in shares)           772,265 548,312                      
Weighted average price per share (in dollars per share) | $ / shares           $ 8.96 $ 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)           771,109             26,844,716          
Stock redeemed, value | $                       $ 252,200,000            
Weighted average price per share (in dollars per share) | $ / shares                       $ 9.40            
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 March 31, 2021.