SECURED FINANCING - Repurchase Agreements - Remaining Maturities, Collateral Types and Weighted Average Rate (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Repurchase Agreements:
Gross amounts	$ 64,200,620	$ 68,302,011
Amounts offset	(2,541,160)	(2,613,088)
Net amounts of Repurchase agreements as presented in the Consolidated Statements of Financial Condition	$ 61,659,460	$ 65,688,923	[1]
Repurchase agreements, remaining maturities, percentage	1.00%	1.00%
CRTs
Repurchase Agreements:
Gross amounts	$ 345,678	$ 569,011
Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	2,460,437	2,481,415
Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	1,669,073	1,390,961
Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	59,672,873	63,794,614
Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	52,559	66,010
1 day
Repurchase Agreements:
Gross amounts	22,600,000	0
1 day | CRTs
Repurchase Agreements:
Gross amounts	0	0
1 day | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
1 day | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	0
1 day | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	22,600,000	0
1 day | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
2 to 29 days
Repurchase Agreements:
Gross amounts	3,228,145	29,936,453
2 to 29 days | CRTs
Repurchase Agreements:
Gross amounts	257,622	405,341
2 to 29 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	861,199	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	2,056,765	28,603,831
2 to 29 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	52,559	66,010
30 to 59 days
Repurchase Agreements:
Gross amounts	15,441,824	35,545,924
30 to 59 days | CRTs
Repurchase Agreements:
Gross amounts	51,904	116,087
30 to 59 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	709,891	682,037
30 to 59 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	251,357
30 to 59 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	14,680,029	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	21,007,475	1,285,522
60 to 89 days | CRTs
Repurchase Agreements:
Gross amounts	36,152	47,583
60 to 89 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	411,299	545,684
60 to 89 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	223,945	0
60 to 89 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	20,336,079	692,255
60 to 89 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
90 to 119 days
Repurchase Agreements:
Gross amounts	115,425	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	115,425	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	0	2,085
90 to 119 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
Over 119 days
Repurchase Agreements:
Gross amounts	1,807,751	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	362,623	332,040
Over 119 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	1,445,128	1,139,604
Over 119 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	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.