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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Servicing Rights (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Mortgage servicing rights          
Classification of Securitizations          
Fair value of capitalized mortgage servicing rights $ 647,000,000 $ 409,000,000 $ 647,000,000 $ 409,000,000  
Principal amount of loans and other financial instruments 48,000,000,000 48,000,000,000 48,000,000,000 48,000,000,000  
Capitalized MSRs          
Balance, at beginning of period 600,000,000 419,000,000 404,000,000 336,000,000  
Originations 25,000,000 8,000,000 94,000,000 76,000,000  
Changes in fair value of MSRs due to changes in inputs and assumptions 37,000,000 (3,000,000) 195,000,000 49,000,000  
Other changes (15,000,000) (15,000,000) (46,000,000) (52,000,000)  
Sale of MSRs 0 0 0 0  
Balance, as of September 30 647,000,000 409,000,000 647,000,000 409,000,000  
MSR fees          
Servicing fees 31,000,000 32,000,000 90,000,000 100,000,000  
Late fees 1,000,000 1,000,000 3,000,000 2,000,000  
Ancillary fees 0 0 0 0  
Total MSR fees 32,000,000 33,000,000 93,000,000 102,000,000  
Mortgage securitizations - Non-agency-sponsored          
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 1,400,000,000   1,400,000,000   1,200,000,000
Securities transferred to re-securitization entities 5,300,000,000 $ 12,600,000,000 20,300,000,000 $ 37,100,000,000  
Market value of retained interest related to re-securitization transaction 747,000,000   747,000,000   641,000,000
Original fair value of re-securitizations deals in which the entity holds a retained interest $ 76,000,000,000   $ 76,000,000,000   $ 78,400,000,000