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Borrowings - Funding Facilities (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
May 10, 2022
Line of Credit Facility [Line Items]      
Total Funding Facilities $ 6,469,607,000 $ 12,751,592,000  
Funding Facilities      
Line of Credit Facility [Line Items]      
Line Amount 24,450,000,000    
Committed Line Amount $ 4,150,000,000    
Funding Facilities | Base rate | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.00% 1.00%  
Funding Facilities | Base rate | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.85% 2.25%  
Funding Facilities | MRA funding      
Line of Credit Facility [Line Items]      
Line Amount $ 17,450,000,000    
Committed Line Amount 4,150,000,000    
Master Repurchase Agreements 4,136,649,000 $ 9,486,726,000  
Funding Facilities | Master Repurchase Agreement Due Oct 20 2023      
Line of Credit Facility [Line Items]      
Line Amount 2,000,000,000    
Committed Line Amount 100,000,000    
Master Repurchase Agreements 246,476,000 249,119,000  
Funding Facilities | Master Repurchase Agreement Due Oct 20 2023 | Subsequent event      
Line of Credit Facility [Line Items]      
Line Amount     $ 1,000,000,000
Funding Facilities | Master Repurchase Agreement Due Dec 01 2022      
Line of Credit Facility [Line Items]      
Line Amount 1,500,000,000    
Committed Line Amount 250,000,000    
Master Repurchase Agreements 576,521,000 1,328,727,000  
Funding Facilities | Master Repurchase Agreement Due Apr 21 2023      
Line of Credit Facility [Line Items]      
Line Amount 2,250,000,000    
Committed Line Amount 500,000,000    
Master Repurchase Agreements 527,655,000 1,714,806,000  
Funding Facilities | Master Repurchase Agreement Due Jan 26 2023      
Line of Credit Facility [Line Items]      
Line Amount 2,000,000,000    
Committed Line Amount 1,200,000,000    
Master Repurchase Agreements $ 1,252,325,000 1,479,128,000  
Facility term 12 months    
Extension term 3 months    
Timing option for extending facility 3 months    
Funding Facilities | Master Repurchase Agreement Due Jan 26 2023 | Subsequent event      
Line of Credit Facility [Line Items]      
Line Amount     1,100,000,000
Funding Facilities | Master Repurchase Agreement Due Apr 20 2023      
Line of Credit Facility [Line Items]      
Line Amount $ 3,000,000,000    
Committed Line Amount 500,000,000    
Master Repurchase Agreements 585,523,000 2,264,954,000  
Funding Facilities | Master Repurchase Agreement Due Apr 20 2023 | Subsequent event      
Line of Credit Facility [Line Items]      
Line Amount     2,000,000,000
Committed Line Amount     250,000,000
Funding Facilities | Master Repurchase Agreement Due Sep 22 2023      
Line of Credit Facility [Line Items]      
Line Amount 2,000,000,000    
Committed Line Amount 500,000,000    
Master Repurchase Agreements 225,067,000 498,335,000  
Funding Facilities | Master Repurchase Agreement Due Sep 22 2023 | Subsequent event      
Line of Credit Facility [Line Items]      
Committed Line Amount     250,000,000
Funding Facilities | Master Repurchase Agreement Due Sep 15 2023      
Line of Credit Facility [Line Items]      
Line Amount 1,200,000,000    
Committed Line Amount 500,000,000    
Master Repurchase Agreements 167,104,000 542,846,000  
Funding Facilities | Master Repurchase Agreement Due Sep 15 2023 | Subsequent event      
Line of Credit Facility [Line Items]      
Line Amount     900,000,000
Committed Line Amount     $ 250,000,000
Funding Facilities | Master Repurchase Agreement Due Jun 10 2022      
Line of Credit Facility [Line Items]      
Line Amount 500,000,000    
Committed Line Amount 0    
Master Repurchase Agreements 0 0  
Funding Facilities | Master Repurchase Agreement Due Sep 22 2023 Two      
Line of Credit Facility [Line Items]      
Line Amount 1,250,000,000    
Committed Line Amount 250,000,000    
Master Repurchase Agreements 243,482,000 539,257,000  
Funding Facilities | Master Repurchase Agreement Due Aug 16 2023      
Line of Credit Facility [Line Items]      
Line Amount 750,000,000    
Committed Line Amount 100,000,000    
Master Repurchase Agreements 89,124,000 616,165,000  
Funding Facilities | Master Repurchase Agreement Due Dec 16 2022      
Line of Credit Facility [Line Items]      
Line Amount 1,000,000,000    
Committed Line Amount 250,000,000    
Master Repurchase Agreements 223,372,000 253,389,000  
Funding Facilities | Early Funding      
Line of Credit Facility [Line Items]      
Line Amount 7,000,000,000    
Committed Line Amount 0    
Early Funding Facilities 2,332,958,000 3,264,866,000  
Funding Facilities | Early Funding Facility, one      
Line of Credit Facility [Line Items]      
Line Amount 4,000,000,000    
Committed Line Amount 0    
Early Funding Facilities 1,328,175,000 2,071,154,000  
Funding Facilities | Early Funding Facility, two      
Line of Credit Facility [Line Items]      
Line Amount 3,000,000,000    
Committed Line Amount 0    
Early Funding Facilities $ 1,004,783,000 $ 1,193,712,000  
Timing for review of agreement 90 days