SECURED FINANCING - Repurchase Agreements - Remaining Maturities, Collateral Types and Weighted Average Rate (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	$ 68,302,011	$ 64,469,836
Amounts offset in accordance with netting arrangements.	(2,613,088)	(2,268,293)
Net amounts of Repurchase agreements as presented in the Consolidated Statements of Financial Condition.	$ 65,688,923	$ 62,201,543
Repurchase agreements, maturity greater than one year, percentage	1.00%	0.00%
CRTs
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	$ 569,011	$ 695,520
Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	2,481,415	2,157,763
Residential mortgage loans
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	1,390,961	851,851
Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	63,794,614	60,573,426
Commercial mortgage-backed securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	66,010	191,276
1 day
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
1 day | CRTs
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
1 day | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
1 day | Residential mortgage loans
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
1 day | Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
1 day | Commercial mortgage-backed securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
2 to 29 days
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	29,936,453	35,080,196
2 to 29 days | CRTs
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	405,341	555,568
2 to 29 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	861,271	840,400
2 to 29 days | Residential mortgage loans
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
2 to 29 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	28,603,831	33,492,952
2 to 29 days | Commercial mortgage-backed securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	66,010	191,276
30 to 59 days
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	35,545,924	18,618,606
30 to 59 days | CRTs
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	116,087	0
30 to 59 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	682,037	528,341
30 to 59 days | Residential mortgage loans
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	251,357	0
30 to 59 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	34,496,443	18,090,265
30 to 59 days | Commercial mortgage-backed securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
60 to 89 days
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	1,285,522	7,198,769
60 to 89 days | CRTs
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	47,583	139,952
60 to 89 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	545,684	579,611
60 to 89 days | Residential mortgage loans
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
60 to 89 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	692,255	6,479,206
60 to 89 days | Commercial mortgage-backed securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
90 to 119 days
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	62,468	247,306
90 to 119 days | CRTs
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
90 to 119 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	60,383	39,714
90 to 119 days | Residential mortgage loans
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	207,592
90 to 119 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	2,085	0
90 to 119 days | Commercial mortgage-backed securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
Over 119 days
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	1,471,644	3,324,959
Over 119 days | CRTs
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	0
Over 119 days | Non-Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	332,040	169,697
Over 119 days | Residential mortgage loans
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	1,139,604	644,259
Over 119 days | Agency Mortgage-Backed Securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	0	2,511,003
Over 119 days | Commercial mortgage-backed securities
Repurchase Agreements:
Total repurchase agreements, before netting adjustments	$ 0	$ 0