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Borrowings - Funding Facilities (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
May 09, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]      
Total funding facilities $ 5,236,034,000   $ 3,548,699,000
Funding Facilities      
Line of Credit Facility [Line Items]      
Line Amount 16,250,000,000    
Committed Line Amount 1,800,000,000    
Total funding facilities 5,217,734,000   3,548,699,000
Funding Facilities | MRA funding      
Line of Credit Facility [Line Items]      
Line Amount 9,250,000,000    
Committed Line Amount 1,800,000,000    
Outstanding balance 3,023,402,000   2,759,717,000
Funding Facilities | Master Repurchase Agreement Due Oct 20 2023      
Line of Credit Facility [Line Items]      
Line Amount 250,000,000    
Committed Line Amount 50,000,000    
Outstanding balance 0   49,381,000
Funding Facilities | Master Repurchase Agreement Due Nov 30 2023      
Line of Credit Facility [Line Items]      
Line Amount 1,000,000,000    
Committed Line Amount 100,000,000    
Outstanding balance 550,258,000   138,057,000
Funding Facilities | Master Repurchase Agreement Due Aug 9 2024      
Line of Credit Facility [Line Items]      
Line Amount 2,000,000,000    
Committed Line Amount 250,000,000    
Outstanding balance 255,281,000   702,128,000
Funding Facilities | Master Repurchase Agreement Due Jan 26 2024      
Line of Credit Facility [Line Items]      
Line Amount 1,500,000,000    
Committed Line Amount 550,000,000    
Outstanding balance $ 754,210,000   917,621,000
Facility term 12 months    
Extension term 3 months    
Timing option for extending facility 3 months    
Funding Facilities | Master Repurchase Agreement Due May 4 2024      
Line of Credit Facility [Line Items]      
Line Amount $ 1,000,000,000    
Committed Line Amount 250,000,000    
Outstanding balance 649,929,000   493,029,000
Funding Facilities | Master Repurchase Agreement Due Sep 9 2024      
Line of Credit Facility [Line Items]      
Line Amount 1,500,000,000    
Committed Line Amount 250,000,000    
Outstanding balance 87,888,000   101,152,000
Funding Facilities | Master Repurchase Agreement Due Sep 9 2024 | Subsequent Event      
Line of Credit Facility [Line Items]      
Line Amount   $ 1,500,000  
Committed Line Amount   $ 1,500,000  
Funding Facilities | Master Repurchase Agreement Due Sep 22 2023      
Line of Credit Facility [Line Items]      
Line Amount 1,250,000,000    
Committed Line Amount 250,000,000    
Outstanding balance 181,107,000   186,707,000
Funding Facilities | Master Repurchase Agreement Due Sep 27 2024      
Line of Credit Facility [Line Items]      
Line Amount 750,000,000    
Committed Line Amount 100,000,000    
Outstanding balance 544,729,000   171,642,000
Funding Facilities | Early Funding      
Line of Credit Facility [Line Items]      
Line Amount 7,000,000,000    
Committed Line Amount 0    
Early funding facilities 2,194,332,000   788,982,000
Funding Facilities | Early Funding Facility, one      
Line of Credit Facility [Line Items]      
Line Amount 5,000,000,000    
Committed Line Amount 0    
Early funding facilities 1,262,204,000   561,874,000
Funding Facilities | Early Funding Facility, two      
Line of Credit Facility [Line Items]      
Line Amount 2,000,000,000    
Committed Line Amount 0    
Early funding facilities $ 932,128,000   $ 227,108,000
Timing for review of agreement 90 days