SECURED FINANCING - Repurchase Agreements - Remaining Maturities, Collateral Types and Weighted Average Rate (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Repurchase Agreements:
Gross amounts	$ 62,799,365	$ 64,469,836
Amounts offset	(2,011,371)	(2,268,293)
Net amounts of Repurchase agreements as presented in the Consolidated Statements of Financial Condition.	$ 60,787,994	$ 62,201,543	[1]
Repurchase agreements, remaining maturities, percentage	1.00%	0.00%
CRTs
Repurchase Agreements:
Gross amounts	$ 636,770	$ 695,520
Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	2,373,513	2,157,763
Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	1,032,679	851,851
Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	58,655,786	60,573,426
Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	100,617	191,276
1 day
Repurchase Agreements:
Gross amounts	21,033,879	0
1 day | CRTs
Repurchase Agreements:
Gross amounts	47,794	0
1 day | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	88,066	0
1 day | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	0
1 day | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	20,898,019	0
1 day | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
2 to 29 days
Repurchase Agreements:
Gross amounts	15,167,764	35,080,196
2 to 29 days | CRTs
Repurchase Agreements:
Gross amounts	315,802	555,568
2 to 29 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	644,301	840,400
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	14,107,044	33,492,952
2 to 29 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	100,617	191,276
30 to 59 days
Repurchase Agreements:
Gross amounts	17,821,775	18,618,606
30 to 59 days | CRTs
Repurchase Agreements:
Gross amounts	0	0
30 to 59 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	711,446	528,341
30 to 59 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	0
30 to 59 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	17,110,329	18,090,265
30 to 59 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
60 to 89 days
Repurchase Agreements:
Gross amounts	4,144,700	7,198,769
60 to 89 days | CRTs
Repurchase Agreements:
Gross amounts	273,174	139,952
60 to 89 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	542,254	579,611
60 to 89 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	0	0
60 to 89 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	3,329,272	6,479,206
60 to 89 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
90 to 119 days
Repurchase Agreements:
Gross amounts	858,510	247,306
90 to 119 days | CRTs
Repurchase Agreements:
Gross amounts	0	0
90 to 119 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	66,755	39,714
90 to 119 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	330,994	207,592
90 to 119 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	460,761	0
90 to 119 days | Commercial Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	0	0
Over 119 days
Repurchase Agreements:
Gross amounts	3,772,737	3,324,959
Over 119 days | CRTs
Repurchase Agreements:
Gross amounts	0	0
Over 119 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	320,691	169,697
Over 119 days | Residential Mortgage Loans
Repurchase Agreements:
Gross amounts	701,685	644,259
Over 119 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Gross amounts	2,750,361	2,511,003
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, 2023.