SECURED FINANCING - Repurchase Agreements - Remaining Maturities, Collateral Types and Weighted Average Rate (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Repurchase Agreements:
Gross amounts	$ 79,599,463	$ 68,302,011
Amounts offset	(4,480,500)	(2,613,088)
Net amounts of Repurchase agreements as presented in the Consolidated Statements of Financial Condition	$ 75,118,963	$ 65,688,923	[1]
Repurchase agreements, remaining maturities, percentage	1.00%	1.00%
CRTs
Repurchase Agreements:
Gross amounts	$ 188,520	$ 569,011
Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	2,566,149	2,481,415
Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	1,779,808	1,390,961
Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	75,064,986	63,794,614
Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	66,010
1 day
Repurchase Agreements:
Gross amounts	31,475,027	0
1 day | CRTs
Repurchase Agreements:
Gross amounts	0	0
1 day | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	46,133	0
1 day | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	0
1 day | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	31,428,894	0
1 day | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
2 to 29 days
Repurchase Agreements:
Gross amounts	2,103,067	29,936,453
2 to 29 days | CRTs
Repurchase Agreements:
Gross amounts	188,520	405,341
2 to 29 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	786,088	861,271
2 to 29 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	0
2 to 29 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	1,128,459	28,603,831
2 to 29 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	66,010
30 to 59 days
Repurchase Agreements:
Gross amounts	14,059,608	35,545,924
30 to 59 days | CRTs
Repurchase Agreements:
Gross amounts	0	116,087
30 to 59 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	544,223	682,037
30 to 59 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	445,868	251,357
30 to 59 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	13,069,517	34,496,443
30 to 59 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
60 to 89 days
Repurchase Agreements:
Gross amounts	22,959,704	1,285,522
60 to 89 days | CRTs
Repurchase Agreements:
Gross amounts	0	47,583
60 to 89 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	574,103	545,684
60 to 89 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	211,837	0
60 to 89 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	22,173,764	692,255
60 to 89 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
90 to 119 days
Repurchase Agreements:
Gross amounts	4,578,922	62,468
90 to 119 days | CRTs
Repurchase Agreements:
Gross amounts	0	0
90 to 119 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	79,295	60,383
90 to 119 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	0
90 to 119 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	4,499,627	2,085
90 to 119 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
Over 119 days
Repurchase Agreements:
Gross amounts	4,423,135	1,471,644
Over 119 days | CRTs
Repurchase Agreements:
Gross amounts	0	0
Over 119 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	536,307	332,040
Over 119 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	1,122,103	1,139,604
Over 119 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	2,764,725	0
Over 119 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	$ 0	$ 0

[1] (1)Derived from the audited consolidated financial statements at December 31, 2024.