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Borrowings - Schedule of Funding Facilities (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Aug. 06, 2024
Line of Credit Facility [Line Items]      
Total funding facilities $ 7,022,439,000 $ 3,367,383,000  
Debt instrument, variable interest rate, type [Extensible Enumeration] Base Rate [Member]    
Funding Facilities      
Line of Credit Facility [Line Items]      
Line Amount $ 18,550,000,000    
Committed Line Amount 1,500,000,000    
Total funding facilities 6,840,039,000 3,251,283,000  
Funding Facilities | MRA funding      
Line of Credit Facility [Line Items]      
Line Amount 11,550,000,000    
Committed Line Amount 1,500,000,000    
Outstanding balance 5,587,547,000 2,781,275,000  
Funding Facilities | Master Repurchase Agreement Due Nov 27 2024      
Line of Credit Facility [Line Items]      
Line Amount 1,000,000,000    
Committed Line Amount 100,000,000    
Outstanding balance 965,966,000 397,265,000  
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 250,623,000 429,976,000  
Funding Facilities | Master Repurchase Agreement Due Aug 9 2024 | Subsequent Event      
Line of Credit Facility [Line Items]      
Line Amount     $ 1,000,000,000
Funding Facilities | Master Repurchase Agreement Due April 25 2025      
Line of Credit Facility [Line Items]      
Line Amount 1,500,000,000    
Committed Line Amount 350,000,000    
Outstanding balance $ 354,786,000 552,079,000  
Facility term 12 months    
Extension term 3 months    
Timing option for extending facility 3 months    
Funding Facilities | Master Repurchase Agreement Due April 25 2025 | Subsequent Event      
Line of Credit Facility [Line Items]      
Committed Line Amount     $ 250,000,000
Funding Facilities | Master Repurchase Agreement Due Sep 8 2025      
Line of Credit Facility [Line Items]      
Line Amount $ 1,000,000,000    
Committed Line Amount 250,000,000    
Outstanding balance 939,150,000 547,016,000  
Funding Facilities | Master Repurchase Agreement Due Nov 6 2025      
Line of Credit Facility [Line Items]      
Line Amount 1,500,000,000    
Committed Line Amount 250,000,000    
Outstanding balance 862,000,000 106,063,000  
Funding Facilities | Master Repurchase Agreement Due Nov 6 2025 | Mortgages      
Line of Credit Facility [Line Items]      
Committed Line Amount 1,500,000,000    
Funding Facilities | Master Repurchase Agreement Due Jul 21 2025      
Line of Credit Facility [Line Items]      
Line Amount 1,000,000,000    
Committed Line Amount 100,000,000    
Outstanding balance 320,688,000 241,574,000  
Funding Facilities | Master Repurchase Agreement Due Sep 26 2025      
Line of Credit Facility [Line Items]      
Line Amount 800,000,000    
Committed Line Amount 100,000,000    
Outstanding balance 769,237,000 507,302,000  
Funding Facilities | Master Repurchase Agreement Due May 6 2026      
Line of Credit Facility [Line Items]      
Line Amount 1,000,000,000    
Committed Line Amount 100,000,000    
Outstanding balance 860,325,000 0  
Funding Facilities | Master Repurchase Agreement Due May 29 2026      
Line of Credit Facility [Line Items]      
Line Amount 1,000,000,000    
Committed Line Amount 0    
Outstanding balance 0 0  
Funding Facilities | Master Repurchase Agreement Due June 12 2026      
Line of Credit Facility [Line Items]      
Line Amount 750,000,000    
Committed Line Amount 0    
Outstanding balance 264,772,000 0  
Funding Facilities | Early Funding      
Line of Credit Facility [Line Items]      
Line Amount 7,000,000,000    
Committed Line Amount 0    
Early funding facilities 1,252,492,000 470,008,000  
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 828,090,000 286,594,000  
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 $ 424,402,000 $ 183,414,000  
Timing for review of agreement 90 days    
Revolving Credit Facility and Security Agreement      
Line of Credit Facility [Line Items]      
Debt instrument, variable interest rate, type [Extensible Enumeration] Base Rate [Member] Base Rate [Member]  
Revolving Credit Facility and Security Agreement | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.00% 1.00%  
Revolving Credit Facility and Security Agreement | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.80% 1.80%  
Revolving Credit Facility and Security Agreement | Personal Loans Held for Sale Maturing Jan 30 2025      
Line of Credit Facility [Line Items]      
Line Amount $ 200,000,000    
Committed Line Amount 200,000,000    
Lines of credit 182,400,000 $ 116,100,000  
Funding Facility      
Line of Credit Facility [Line Items]      
Line Amount 18,750,000,000    
Committed Line Amount 1,700,000,000    
Lines of credit $ 7,022,439,000 $ 3,367,383,000