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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Servicing Rights (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Mortgage servicing rights      
Classification of Securitizations      
Principal amount of loans and other financial instruments $ 59,000.0 $ 56,000.0  
MSR fees      
Servicing fees 147.0 127.0 $ 129.0
Late fees 2.0 1.0 4.0
Total MSR fees $ 149.0 $ 128.0 $ 133.0
Servicing fees, location Commissions and fees Commissions and fees Commissions and fees
Mortgage securitizations - Non-agency-sponsored      
Classification of Securitizations      
Principal securitized $ 9,800.0 $ 9,400.0 $ 4,800.0
Proceeds from new securitizations 7,300.0 8,800.0 $ 3,500.0
Mortgage-backed securities - U.S. agency-sponsored      
Re-securitizations      
Securities transferred to re-securitization entities 31,800.0 22,800.0  
Fair value of re-securitizations deals in which the entity holds a retained interest 2,600.0 1,600.0  
Market value of retained interest related to re-securitization transaction 1,900.0 977.0  
Original fair value of re-securitizations deals in which the entity holds a retained interest 83,400.0 76,800.0  
Consumer      
Classification of Securitizations      
Principal securitized 1,800.0 1,200.0  
Proceeds from new securitizations 1,800.0 1,200.0  
Gains recognized on the securitization $ 5.2 $ 5.1