SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 7) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Re-securitizations
Balance at beginning of period					$ 1,942,000,000
Balance at end of period	2,580,000,000		2,580,000,000		1,942,000,000
Mortgage servicing rights
Classification of Securitizations
Fair value of capitalized mortgage servicing rights	2,600,000,000	1,900,000,000	2,600,000,000	1,900,000,000
Principal amount of loans and other financial instruments	295,000,000,000	347,000,000,000	295,000,000,000	347,000,000,000
Re-securitizations
Balance at beginning of period	2,524,000,000	2,117,000,000	1,942,000,000	2,569,000,000
Originations	167,000,000	101,000,000	543,000,000	324,000,000
Changes in fair value of MSRs due to changes in inputs and assumptions	11,000,000	(118,000,000)	481,000,000	(289,000,000)
Other changes	(121,000,000)	(180,000,000)	(384,000,000)	(684,000,000)
Sale of MSRs	(1,000,000)		(2,000,000)
Balance at end of period	2,580,000,000	1,920,000,000	2,580,000,000	1,920,000,000
Servicing fees	196,000,000	236,000,000	611,000,000	757,000,000
Late fees	12,000,000	16,000,000	31,000,000	49,000,000
Ancillary fees	27,000,000	37,000,000	79,000,000	90,000,000
Total MSR fees	235,000,000	289,000,000	721,000,000	896,000,000
Non-agency-sponsored mortgages
Re-securitizations
Original par value of securities transferred to re-securitization entities	284,000,000	541,000,000	680,000,000	1,300,000,000
Original par value of re-securitizations deals in which the entity holds a retained interest	6,000,000,000		6,000,000,000		7,100,000,000
Fair value of re-securitizations deals in which the entity holds a retained interest	376,000,000		376,000,000		380,000,000
Market value of retained interest related to re-securitization transaction in 2013	70,000,000		70,000,000		128,000,000
Senior interests
Re-securitizations
Fair value of re-securitizations deals in which the entity holds a retained interest	19,000,000		19,000,000		11,000,000
Subordinated interests
Re-securitizations
Fair value of re-securitizations deals in which the entity holds a retained interest	357,000,000		357,000,000		369,000,000
U.S. government-sponsored agency guaranteed
Re-securitizations
Fair value of re-securitizations deals in which the entity holds a retained interest	1,500,000,000		1,500,000,000		1,700,000,000
Market value of retained interest related to re-securitization transaction in 2013	1,100,000,000		1,100,000,000		1,100,000,000
Original fair value of re-securitizations deals in which the entity holds a retained interest	77,700,000,000		77,700,000,000		71,200,000,000
Securities transferred to re-securitization entities	$ 5,300,000,000	$ 7,500,000,000	$ 20,100,000,000	$ 22,100,000,000