v3.26.1
SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Servicing Rights (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Personal installment loan          
Classification of Securitizations          
Principal securitized $ 600,000,000 $ 300,000,000 $ 800,000,000 $ 600,000,000  
Proceeds from new securitizations 600,000,000 300,000,000 800,000,000 600,000,000  
Gains recognized on the securitization 2,600,000 500,000 14,200,000 700,000  
Mortgage servicing rights          
Classification of Securitizations          
Principal amount of loans and other financial instruments 60,000,000,000 57,000,000,000 60,000,000,000 57,000,000,000  
MSR fees          
Servicing fees 37,000,000 38,000,000 73,000,000 75,000,000  
Late fees 0 0 1,000,000 1,000,000  
Total MSR fees 37,000,000 38,000,000 74,000,000 76,000,000  
Mortgage securitizations - Non-agency-sponsored          
Classification of Securitizations          
Principal securitized 3,700,000,000 1,400,000,000 8,700,000,000 2,800,000,000  
Proceeds from new securitizations 3,600,000,000 1,000,000,000.0 8,400,000,000 2,300,000,000  
Gains recognized on the securitization 78,700,000 34,700,000 139,400,000 95,500,000  
Re-securitizations          
Fair value of re-securitizations deals in which the entity holds a retained interest 0   0   $ 0
Mortgage securitizations - U.S. agency-sponsored          
Re-securitizations          
Fair value of re-securitizations deals in which the entity holds a retained interest 2,500,000,000   2,500,000,000   2,600,000,000
Securities transferred to re-securitization entities 10,200,000,000 $ 6,700,000,000 18,600,000,000 $ 13,600,000,000  
Market value of retained interest related to re-securitization transaction 1,600,000,000   1,600,000,000   1,900,000,000
Original fair value of re-securitizations deals in which the entity holds a retained interest $ 92,800,000,000   $ 92,800,000,000   $ 83,400,000,000