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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 7) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Mortgage servicing rights
Jun. 30, 2011
Mortgage servicing rights
Jun. 30, 2012
Mortgage servicing rights
Jun. 30, 2011
Mortgage servicing rights
Jun. 30, 2012
Non-agency-sponsored mortgages
Jun. 30, 2012
Senior interests
Jun. 30, 2012
Subordinated interests
Jun. 30, 2012
U.S. government-sponsored agency guaranteed
Classification of Securitizations                    
Fair value of capitalized mortgage servicing rights     $ 2,100,000,000 $ 4,300,000,000 $ 2,100,000,000 $ 4,300,000,000        
Principal amount of loans and other financial instruments     367,000,000,000 433,000,000,000 367,000,000,000 433,000,000,000        
Re-securitizations                    
Balance at beginning of period 2,117,000,000 2,569,000,000 2,691,000,000 4,690,000,000 2,569,000,000 4,554,000,000        
Originations     79,000,000 105,000,000 223,000,000 299,000,000        
Changes in fair value of MSRs due to changes in inputs and assumptions     (420,000,000) (277,000,000) (171,000,000) (105,000,000)        
Other changes     (233,000,000) (260,000,000) (504,000,000) (490,000,000)        
Balance at end of period 2,117,000,000 2,569,000,000 2,117,000,000 4,258,000,000 2,117,000,000 4,258,000,000        
Servicing fees     253,000,000 301,000,000 521,000,000 605,000,000        
Late fees     16,000,000 18,000,000 33,000,000 39,000,000        
Ancillary fees     25,000,000 25,000,000 53,000,000 53,000,000        
Total MSR fees     294,000,000 344,000,000 607,000,000 697,000,000        
Original par value of re-securitizations deals in which the entity holds a retained interest             7,200,000,000      
Original par value of securities transferred to re-securitization entities             283,000,000      
Market value of retained interest related to re-securitization transaction in 2012             88,000,000     1,000,000,000
Original fair value of re-securitizations deals in which the entity holds a retained interest 65,300,000,000                  
Securities transferred to re-securitization entities                   7,200,000,000
Fair value of re-securitizations deals in which the entity holds a retained interest             $ 396,000,000 $ 16,000,000 $ 380,000,000 $ 2,200,000,000