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SECURITIES - Summary of Residential Securities and CMBS (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
USD ($)
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2023 $ 65,789,907 [1],[2]
Purchases 30,997,473
Sales (20,869,082)
Principal paydowns (4,706,959)
(Amortization) / accretion (112,988)
Fair value adjustment (1,237,621)
Ending balance September 30, 2023 69,860,730 [2]
Agency Securities  
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2023 62,274,895
Purchases 30,200,558
Sales (19,960,379)
Principal paydowns (4,469,534)
(Amortization) / accretion (130,409)
Fair value adjustment (1,323,595)
Ending balance September 30, 2023 66,591,536
Residential Credit Securities  
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2023 2,988,703
Purchases 720,749
Sales (516,501)
Principal paydowns (231,991)
(Amortization) / accretion 16,498
Fair value adjustment 69,354
Ending balance September 30, 2023 3,046,812
Commercial Securities  
Debt Securities, Available-For-Sale [Roll Forward]  
Beginning balance January 1, 2023 526,309
Purchases 76,166
Sales (392,202)
Principal paydowns (5,434)
(Amortization) / accretion 923
Fair value adjustment 16,620
Ending balance September 30, 2023 $ 222,382
[1] (1)Derived from the audited consolidated financial statements at December 31, 2022.
[2] (3)Excludes $1.3 billion and $1.0 billion at September 30, 2023 and December 31, 2022, respectively, of non-Agency mortgage-backed securities in consolidated VIEs pledged as collateral and eliminated from the Company’s Consolidated Statements of Financial Condition.