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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Mortgage securitizations - U.S. agency sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 800.0 $ 2,100.0  
Proceeds from new securitizations 800.0 2,000.0  
Contractual servicing fees received 0.0 0.0  
Cash flows received on retained interests and other net cash flows 0.0 0.0  
Purchases of previously transferred financial assets 0.0 0.0  
Gains recognized on the securitization 0.1 0.3  
Carrying value of retained interests 656.0   $ 659.0
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized 1,300.0 1,600.0  
Proceeds from new securitizations 1,100.0 1,600.0  
Contractual servicing fees received 0.0 0.0  
Cash flows received on retained interests and other net cash flows 0.0 0.0  
Purchases of previously transferred financial assets 0.0 0.0  
Gains recognized on the securitization 2.4 $ 39.0  
Senior interests      
Cash Flows Between Transferor and Transferee      
Carrying value of retained interests 1,143.0   1,119.0
Subordinated interests      
Cash Flows Between Transferor and Transferee      
Carrying value of retained interests 937.0   $ 943.0
Personal loan      
Cash Flows Between Transferor and Transferee      
Carrying value of retained interests $ 18.0