SECURITIES - Summary of Residential Securities and CMBS (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($)
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2025	$ 69,756,447	[1],[2]
Purchases	14,792,221
Sales	(8,498,108)
Principal paydowns	(3,816,328)
(Amortization) / accretion	(85,631)
Fair value adjustment	1,352,025
Ending balance June 30, 2025	73,500,626	[2]
Agency Securities
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2025	67,434,068
Purchases	14,488,441
Sales	(8,141,852)
Principal paydowns	(3,304,684)
(Amortization) / accretion	(82,302)
Fair value adjustment	1,362,967
Ending balance June 30, 2025	71,756,638
Residential Credit Securities
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2025	2,248,101
Purchases	303,780
Sales	(314,442)
Principal paydowns	(479,193)
(Amortization) / accretion	(3,249)
Fair value adjustment	(11,009)
Ending balance June 30, 2025	1,743,988
Commercial Securities
Debt Securities, Available-For-Sale [Roll Forward]
Beginning balance January 1, 2025	74,278
Purchases	0
Sales	(41,814)
Principal paydowns	(32,451)
(Amortization) / accretion	(80)
Fair value adjustment	67
Ending balance June 30, 2025	$ 0

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

[2] (3)Excludes $2.6 billion and $2.2 billion at June 30, 2025 and December 31, 2024, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.