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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 7) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Mortgage servicing rights
Sep. 30, 2011
Mortgage servicing rights
Sep. 30, 2012
Mortgage servicing rights
Sep. 30, 2011
Mortgage servicing rights
Sep. 30, 2012
Non-agency-sponsored mortgages
Sep. 30, 2012
Senior interests
Sep. 30, 2012
Subordinated interests
Sep. 30, 2012
U.S. government-sponsored agency guaranteed
Classification of Securitizations                    
Fair value of capitalized mortgage servicing rights     $ 1,900,000,000 $ 2,900,000,000 $ 1,900,000,000 $ 2,900,000,000        
Principal amount of loans and other financial instruments     347,000,000,000 421,000,000,000 347,000,000,000 421,000,000,000        
Re-securitizations                    
Balance at beginning of period 1,920,000,000 2,569,000,000 2,117,000,000 4,258,000,000 2,569,000,000 4,554,000,000        
Originations     101,000,000 126,000,000 324,000,000 425,000,000        
Changes in fair value of MSRs due to changes in inputs and assumptions     (118,000,000) (1,196,000,000) (289,000,000) (1,301,000,000)        
Other changes     (180,000,000) (336,000,000) (684,000,000) (826,000,000)        
Balance at end of period 1,920,000,000 2,569,000,000 1,920,000,000 2,852,000,000 1,920,000,000 2,852,000,000        
Servicing fees     236,000,000 292,000,000 757,000,000 897,000,000        
Late fees     16,000,000 19,000,000 49,000,000 58,000,000        
Ancillary fees     37,000,000 39,000,000 90,000,000 92,000,000        
Total MSR fees     289,000,000 350,000,000 896,000,000 1,047,000,000        
Original par value of re-securitizations deals in which the entity holds a retained interest             7,300,000,000      
Original par value of securities transferred to re-securitization entities             541,000,000      
Market value of retained interest related to re-securitization transaction in 2012             102,000,000     600,000,000
Original fair value of re-securitizations deals in which the entity holds a retained interest 65,900,000,000                  
Securities transferred to re-securitization entities                   7,500,000,000
Fair value of re-securitizations deals in which the entity holds a retained interest             $ 394,000,000 $ 10,000,000 $ 384,000,000 $ 1,400,000,000